(Machine Translation by Espacenet)
`
`Bibliographic data
`
`CN103904296 (A}
`
`- Nonaqueous Electrolyte second battery applied electrode and
`
`nonaqueous Electrolyte second battery
`
`Inventor(s):
`
`KOYAMA KUNIHIKO; WATANABE RIKO; KOTANI TAKAHIRO; GOSHIMA ERI
`
`Applicani(s):
`
`HITACHI LTD
`
`Classification:
`
`- international:
`
`HO1M10/05; HO1M2/16; HO1M2/18; HO1M4/13
`
`- cooperative:
`
`HO1M1G/05 (KR); HO1M4/13 (CN, KR); HO1M50/46 (KR); HO1M50/464
`
`(CN);
`
`HO1M10/05 (CN); YO2E60/10 (EP, KR)
`
`Application number:
`
`CN20131014584 20130115
`
`Priority number(s):
`JP20120280608 20121225
`
`Also published as:
`
`KR20740082910 (A)
`
`Abstract
`
`Abstract of CN103904296 (A)
`
`The invention provides a nonaqueous electrolyte second battery applied electrode and
`
`nonaqueous Electrolytes second battery whoseinsulation layer is thin and is capable of
`
`preventing short circuits. The non-aqueous electrolyte secondary battery applied
`
`electrode comprises a collector (11), an electrode mixture layer (12) with active
`
`substance arranged at least one side of the collector, and an insulation layer (13) coated
`
`
`
`Bibliographic data
`
`CN103904296 (A}
`
`- Nonaqueous Electrolyte second battery applied electrode and
`
`nonaqueous Electrolyte second battery
`
`Inventor(s):
`
`KOYAMA KUNIHIKO; WATANABE RIKO; KOTANI TAKAHIRO; GOSHIMA ERI
`
`Applicani(s):
`
`HITACHI LTD
`
`Classification:
`
`- international:
`
`HO1M10/05; HO1M2/16; HO1M2/18; HO1M4/13
`
`- cooperative:
`
`HO1M1G/05 (KR); HO1M4/13 (CN, KR); HO1M50/46 (KR); HO1M50/464
`
`(CN);
`
`HO1M10/05 (CN); YO2E60/10 (EP, KR)
`
`Application number:
`
`CN20131014584 20130115
`
`Priority number(s):
`JP20120280608 20121225
`
`Also published as:
`
`KR20740082910 (A)
`
`Abstract
`
`Abstract of CN103904296 (A)
`
`The invention provides a nonaqueous electrolyte second battery applied electrode and
`
`nonaqueous Electrolytes second battery whoseinsulation layer is thin and is capable of
`
`preventing short circuits. The non-aqueous electrolyte secondary battery applied
`
`electrode comprises a collector (11), an electrode mixture layer (12) with active
`
`substance arranged at least one side of the collector, and an insulation layer (13) coated
`
`
`
`on the surface of the electrode mixture layer. The insulating layer (13) contains resin
`
`containing energy ray curing resin porous layer, and is located at the inner side of the
`
`electrode mixture layer and the thickness of the insulation layer at the inner side d2 is 3
`
`mim more and less than 18 mim, while the thickness of the insulation layer at the
`
`circumference of the electrode mixture layer is greater than d2 in at least one portion.
`
`Claims
`
`Notice
`
`This translation is machine-generated.
`
`it cannot be guaranteed that it
`
`is intelligible,
`
`accurate, complete, reliable or fit for specific purposes. Critical decisions, such as
`
`commercially relevant or financial decisions, should not be based on machine-translation
`
`output.
`
`CLAIMS CN103904296A
`
`An electrode for a non-aqueous electrolyte secondary battery, characterized in that:
`
`a current collector, an electrode mixture layer containing an active material formed on at
`
`least one side of the current collector, and an insulating layer covering the surface of the
`
`electrode mixture layer;
`
`the insulating layer contains a resin porous layer containing an energy ray-curabie resin;
`
`The thickness d2 of the insulating layer covering the surface of the electrode mixture
`
`layer is not less than 3 um and not more than 18 um on the inner side of the electrode
`
`mixture layer than the peripheral edge;
`
`in the peripheral portion of the electrode mixture layer, the thickness of at least a part of
`
`the insulating layer covering the surface of the electrode mixture layeris thicker than d2.
`
`The electrode for a nonaqueous electrolyte secondary battery according to claim 1,
`
`wherein the resin porous layer further containsfiller particles.
`
`
`
`The electrode for a nonaqueouselectrolyte secondary battery according to claim 14 or 2,
`
`wherein at least a part of the insulating layer covering the peripheral portion of the
`
`electrode mixture layer is formed by the porous resin layer and the It consists of a resin
`
`layer other than the energy ray-curable resin, and its thickness is thicker than d2.
`
`The electrode for a nonaqueous electrolyte secondary battery according to claim 1 or2,
`
`wherein the insulating layer further coats the end surface of the electrode mixture layer.
`
`The electrode for a non-aqueous electrolyte secondary battery according to claim 1 or2,
`
`wherein the thickness of at least a part of the insulating layer covering the peripheral
`
`portion of the electrode mixture layer is greater than d2 by 2 m or more.
`
`The electrode for a non-aqueouselectrolyte secondary battery according to claim 1 or2,
`
`wherein the thickness of the insulating layer covering the peripheral edge portion of the
`
`electrode mixture layer is thicker than d2 over the entire peripheral edge.
`
`The electrode for a non-aqueous electrolyte secondary battery according to claim 6,
`
`wherein the difference between the thickness of the insulating layer covering the
`
`peripheral portion of the electrode mixture layer and d2 is 20 m orless.
`
`The electrode for a non-aqueous electrolyte secondary battery according to claim 1 or2,
`
`wherein the electrode for a non-aqueous electrolyte secondary battery is a negative
`
`electrode.
`
`
`
`A non-aqueous electrolyte secondary battery comprising a positive electrode and a
`
`negative electrode, wherein at least one of the positive electrode and the negative
`
`electrode is the electrode for a non-aqueous electrolyte secondary battery according to
`
`claim 1 or 2.
`
`10.
`
`The non-aqueouselectrolyte secondary battery according to claim 9, wherein a thickness
`
`ratio d2 of a portion of the insulating layer covering the peripheral edge portion of the
`
`electrode mixture layer pressed by the lead of the opposite electrode,
`
`the current
`
`collector, or the mixture layer thicker.
`
`V4.
`
`The nonaqueous electrolyte secondary battery according to claim 9, wherein at least the
`
`negative electrode is the electrode for a nonaqueous electrolyte secondary battery
`
`according to claim 1 or 2.
`
`Description
`
`Notice
`
`This translation is machine-generated.
`
`It cannot be guaranteed that it
`
`is intelligible,
`
`accurate, complete, reliable or fit for specific purposes. Critical decisions, such as
`
`commercially relevant or financial decisions, should not be based on machine-translation
`
`output.
`
`DESCRIPTION CN103904296A
`
`Electrode for non-aqueous electrolyte secondary battery and non-aqueous electrolyte
`
`secondary battery
`
`[0001]
`
`technical field
`
`
`
`[0002]
`
`The present invention relates to an electrode for a nonaqueous electrolyte secondary
`
`battery and a nonaqueous electrolyte secondary battery.
`
`Background technique
`
`[0003}
`
`Conventionally, a configuration of a non-aqueous electrolyte secondary battery including
`
`positive and negative electrodes and separators has been known.
`
`As the separator, for example, a poiyolefin-based porous membrane having a thickness
`
`of about 20 te 30 um is used.
`
`[0004]
`
`in recent years, non-aqueous electrolyte secondary batteries having high current
`
`characteristics at high output are being sought.
`
`in such a battery, in order to reduce the internal resistance, it is preferable to make the
`
`film thickness of the separator as thin as possible. However, when the film thickness of
`
`the separatoris reduced, the handling becomesdifficult.
`
`[0005]
`
`Japanese Patent No. 4407020 (Patent Document 1} and Japanese Patent Laid-Open
`
`No. 2010-170770 (Patent Document 2) disclose techniques of integrally forming a
`
`separator and an electrode.
`
`{O006]
`
`Patent Document
`
`1 describes a process comprising a step of immersing a battery
`
`electrode in a solution in which the constituent materials constituting the separator are
`
`dispersed in a solvent, and a step of forming a potential gradient in the solution and
`
`
`
`causing the constituent materials to adhere to the surface of the battery electrode by
`
`electrophoresis. A method of manufacturing an electrode for a battery with a separator.
`
`[0007]
`
`The non-aqueous electrolyte secondary battery described in Patent Document 2 is
`
`characterized in that the porous separator (separator) contains a cross-linked resin, and
`
`a part of the cross-linked resin is present in the positive electrode material mixture layer
`
`and/or the negative electrode material mixture layer.
`
`in addition, this document describes the use of a compound that is polymerized and
`
`cured by energyrayirradiation as a crosslinking resin.
`
`[0008]
`
`prior art literature
`
`[0009}
`
`Patent Literature
`
`[0010}
`
`Patent Document 1: Japanese Patent No. 4407020
`
`[00114]
`
`Patent Document 2: Japanese Patent Application Laid-Open No. 2010-170770
`
`[0012]
`
`SUMMARY OF THE INVENTION
`
`[0013]
`
`invention to solve problem
`
`
`
`[0014]
`
`As described above, if the film thickness of the separator (insulating layer) is made thin,
`
`the internal resistance of the battery can be reduced.
`
`However, when the film thickness of the insulating layer is reduced, a short circuit tends
`
`to occur and the yield decreases.
`
`Therefore, the yield decreases and the manufacturing cost increases.
`
`[0015]
`
`An abject of the present invention is to provide an electrode for a non-aqueous electrolyte
`
`secondary battery and a non-aqueous electrolyte secondary battery which can prevent
`
`short circuit even if the thickness of the insulating film is thin.
`
`[0016]
`
`means of solving problems
`
`[0017]
`
`The electrode for a nonaqueous electrolyte secondary battery disclosed herein includes
`
`a current collector, an electrode mixture layer containing an active material formed on at
`
`least one surface of the current collector, and an insulating layer covering the surface of
`
`the electrode mixture layer.
`
`The insulating layer contains a resin porous layer containing an energy ray-curabie resin;
`
`the thickness d2 of the insulating film covering the surface of the electrode mixture layer
`
`on the inner side of the electrode mixture layer than the peripheral portion is 3 um or
`
`more and 18 um or less;
`
`In the peripheral portion of the layer, at least a part of the
`
`insulating layer covering the surface of the electrode mixture layer has a thickness
`
`greater than d2.
`
`[0018]
`
`
`
`The present inventors have discovered that in a non-aqueous electrolyte secondary
`
`battery, a large force is easily applied to the peripheral partion of the electrode.
`
`According to the above configuration, the thickness of the insulating layer covering the
`
`peripheral edge portion of the electrode mixture layeris at least partially thicker than the
`
`thickness d2 covering the surface of the mixture layer on the inner side of the peripheral
`
`edge portion.
`
`in this way, even when the thickness inside the peripheral portion is 3 to 18 ym, short-
`
`circuiting can be prevented.
`
`[0019]
`
`The non-aqueous electrolyte secondary battery disclosed herein is a non-aqueous
`
`electrolyte secondary battery including a positive electrode and a negative electrode,
`
`and at least one of the positive electrode and the negative electrode is the electrode for
`
`the above-mentioned non-aqueous electrolyte secondary battery.
`
`[0020]
`
`invention effect
`
`[0021]
`
`According to the present invention, if is possible to obtain an electrode for a non-aqueous
`
`electrolyte secondary battery and a non-aqueous electrolyte secondary battery which
`
`can prevent short circuits even if the thickness of the insulating layer is thin.
`
`[0022]
`
`Description of drawings
`
`[0023]
`
`Fig. 1 is a plan view showing a schematic configuration of an electrode for a non-aqueous
`
`
`
`electrolyte secondary battery according to a first embodiment of the present invention.
`
`[0024]
`
`FIG. 2 shows a cross-sectional view taken along the line Il-I in FIG. 1.
`
`[0025]
`
`FIG. 3 shows a cross-sectional view taken alongline HI-Hlin FIG. 1.
`
`[0026]
`
`Fig. 4 is a plan view showing a schematic configuration of a non-aqueous electrolyte
`
`secondary battery according to an embodiment of the present invention.
`
`[0027]
`
`FIG. 5 shows a cross-sectional view taken along the line V-V in FIG. 4.
`
`[0028]
`
`FIG. 6 shows a cross-sectional view taken along the line VI-Vl in FIG. 4.
`
`[0029]
`
`Fig. 7 is a plan view showing a schematic configuration of an electrode for a non-aqueous
`
`electrolyte secondary battery according to a second embodimentof the present invention.
`
`[0030]
`
`FIG. 8 shows a cross-sectional view taken alongline VIII-VIIl in FIG. 7.
`
`[0031]
`
`FIG. 9 shows a cross-sectional view taken along line [X-IX in FIG. 7.
`
`
`
`[0032]
`
`Fig. 10 is a plan view showing a schematic configuration of an electrode for a non-
`
`aqueous electrolyte secondary battery according to a third embodiment of the present
`invention.
`
`[0033]
`
`FIG. 11 shows a cross-sectional view taken along line XI-XI in FIG. 70.
`
`[0034]
`
`FIG. 12 shows a cross-sectional view taken along the line XII-Xll in FIG. 10.
`
`[0035]
`
`Fig. 13 is an exploded perspective view showing a schematic configuration of an
`
`electrode for a non-aqueous electrolyte secondary battery according to a fourth
`
`embodiment of the present invention.
`
`[0036]
`
`Fig. 14 is a plan view showing a schematic configuration of an electrode for a non-
`
`aqueous electrolyie secondary battery according to a fifth embodiment of the present
`invention.
`
`{0037]
`
`FIG. 15 shows a cross-sectional view taken along the fine XV-XV in FIG. 14.
`
`[0038]
`
`FIG. 16 shows a cross-sectional view taken along the line XVI-XVI in FIG. 14.
`
`[0039]
`
`
`
`Fig. 17 is a plan view showing a schematic configuration of an electrode for a non-
`
`aqueous electrolyte secondary battery according to a sixth embodiment of the present
`invention.
`
`[0040}
`
`FIG. 18 shows a cross-sectional view taken along fine XVIII-XVIII in FIG. 17 .
`
`[0041]
`
`FIG. 19 shows a cross-sectional view taken along line XIX-XIX in FIG. 17.
`
`[0042]
`
`Symbol Description
`
`[0043]
`
`1, 2, 3, 4, 5, 6: Electrode for non-aqueous electrolyte secondary battery; 11: current
`
`collector; 12: electrode mixture layer; 13, 23, 33, 43, 53, 63: insulating layer; 10: non-
`
`aqueouselectrolyte secondary battery; 101: negative electrode; 102 : positive electrode;
`
`103: negative electrode tab; 104: positive electrode tab; 105: laminated packaging body;
`
`106: negative electrode lead; 107: positive electrode lead.
`
`[0044]
`
`detailed description
`
`[0045]
`
`Hereinafter, embodiments of the present
`
`invention will be described in detail with
`
`reference to the accompanying drawings.
`
`The same or corresponding parts in the figures are given the same reference numerals,
`
`and will not be repeated.
`
`
`
`in addition, the dimensions of the components in each drawing do notfaithfully represent
`
`the dimensions of the actual constituent components and the dimensional ratios of the
`
`componenis.
`
`[0046]
`
`[Configuration of Electrode for Nonaqueous Electrolyte Secondary Battery]
`
`[0047]
`
`Fig.
`
`1
`
`is a plan view showing a schematic configuration of an electrode 1 for a non-
`
`aqueous electrolyie secondary battery according to a first embodiment of the present
`invention.
`
`FIG. 2 is a cross-sectional view taken alongline Il-ll in FIG. 1.
`
`FIG. 3 is a cross-sectional view taken alongline IIl-Il} in FIG. 7.
`
`[0048]
`
`The electrode 1 for a non-aqueous electrolyte secondary battery includes a current
`
`collector 11, an electrode mixture layer 12, and an insulating layer 13.
`
`Of these, the electrode 1
`
`for a non-aqueous electrolyte secondary battery can be
`
`implemented as either the positive electrode or the negative electrode.
`
`{0049}
`
`The current collector 11 has a rectangular sheet shape in plan view.
`
`When the electrode 1 for a non-aqueous electrolyie secondary battery is a positive
`
`electrode, the current collector 11 is, for example, a foil of aluminum, titanium, or the like,
`
`a plain woven metal mesh, a stretched metal, a metal lath, a stamped metal, or the like.
`
`When the electrode 7 for a non-aqueous electrolyte secondary battery is a negative
`
`electrode, the current collector 11 is, for example, foil of copper, nickel, stainless steel,
`
`
`
`etc., plain woven metal mesh, expanded metal, expanded metal, stamped metal, or the
`
`like.
`
`[0050]
`
`The current collector 11 has an exposed portion 77a that is not covered by either of the
`
`electrode mixture layer 12 and the insulating layer 13.
`
`The exposed portion 11a is used for connecting a lead wire or the like to the electrode 1
`
`for a non-aqueous electrolyte secondary battery.
`
`[0051]
`
`Electrode mixture layers 12 are formed on both surfaces of the current collector 11.
`
`The electrode mixture layer 12 may be formed only on one surface of the current collector
`44.
`
`The electrode mixture layer 12 is a mixture of an active material, a binder, and a
`
`conductive auxiliary agent added as needed.
`
`[0052]
`
`When the electrode 1
`
`for a nonaqueous electrolyte secondary battery is a positive
`
`electrode, as the active material,
`
`lithium manganate,
`
`lithium nickel composite oxide,
`
`lithium cobalt composite oxide, lithium nickel cobalt composite oxide, vanadium oxide,
`
`molybdenum oxide, or the like can be used.
`
`As the conductive aid, graphite, carbon black, acetylene black, or the like can be used.
`
`As
`
`the
`
`binder,
`
`polyimide,
`
`polyamideimide,
`
` polytetrafluoroethylene
`
`(PTFE),
`
`polyvinylidene fluoride (PVDF}, etc. can be used alone or in combination.
`
`[0053]
`
`When the electrode 7 for a non-aqueous electrolyte secondary battery is a negative
`
`
`
`electrode, as the active material, natural graphite, mesophase carbon, amorphous
`
`carbon, or the like can be used.
`
`As the binder, cellulose such as carboxymethyl cellulose (CMC) and hydroxypropyl
`
`cellulose (HPC), rubber binders such as styrene-butadiene rubber (SBR), acrylic rubber,
`
`etc., PTFE, PVDF, etc., can be used alone or in combination .
`
`[0054]
`
`The insulating layer 13 coats the surface of the electrode mixture layer 12.
`
`The thickness d1 of the insulating layer 13 at the peripheral edge portion of the electrode
`
`mixture layer 12 is thicker than the thickness d2 at the inner side of the peripheral edge
`
`portion.
`
`in other words, the thickness d1 of the peripheral edge portion 13a is thicker than the
`
`thickness d2 of the non-peripheral edge portion 13b.
`
`[0055]
`
`The thinner the thickness of the insulating layer 13, the smaller the internal resistance of
`
`the non-aqueous electrolyte secondary battery.
`
`On the other hand, when the thickness of the insulating layer 13 is too thin, it becomes
`
`difficult to form a uniform film.
`
`Therefore, in terms of the thickness of the insulating layer 13, the thickness d2 in the
`
`non-peripheral portion 13b is 3 to 18 um.
`
`The thickness d2 of the non-peripheral edge portion 13b is preferably 5 um or more, and
`
`more preferably 8 um or more.
`
`in addition, the thickness d2 of the non-peripheral edge portion 13b is preferably 16 um
`
`or jess, and more preferably 15 um orless.
`
`[0056]
`
`
`
`The thickness of the peripheral edge portion 13a is not particularly limited as long asit
`
`is thicker than the thickness d2 of the non-peripheral edge portion.
`
`On the other hand, if the thickness difference between the twois too large, problems
`
`such as bending may occur in the peripheral portion of the counter electrode when the
`
`arrangement of the counter electrode is slightly shifted when assembling the battery.
`
`Therefore, the thickness of the peripheral portion 13a is different from The difference in
`
`thickness of the non-peripheral edge portion 13b is preferably 20 um or less, and more
`
`preferably 15 um or less.
`
`in addition, although the peripheral edge portion 13a of the insulating layer 13 is
`
`described as having the same thickness as a whole in the drawings, it is not necessary
`
`to form the entire thickness with the same thickness, for example, it may be formed ina
`
`shapelike a mountain.
`
`in this case, the thickness d7 of the peripheral edge portion 13a is determined by the
`
`thickness of the apex of the mountain.
`
`The same applies to the second to fifth embodiments described later.
`
`[0057]
`
`The widths (dimensions from the end faces) t1 to t4 of the peripheral edge portion 13a
`
`are not particularly limited, and may be, for example, 1 to 2 mm.
`
`in the present embodiment, the widths t1 to t4 are substantially equal.
`
`However, the widths t1 to t4 may also be different from each other.
`
`[0058]
`
`in addition, when the electrode 1 for a non-aqueous electrolyte secondary battery is a
`
`negative electrode, the area of the non-peripheral portion 13b is preferably larger than
`
`the area of the positive electrode material mixture layer arranged to be stacked.
`
`
`
`More specifically, the dimension W711
`
`in the x-axis direction of the non-peripheral edge
`
`portion 13b is preferably larger than the dimension in the x-axis direction of the positive
`
`electrode mixture layer, and the dimension H1 in the y-axis direction is preferably larger
`
`than the dimension in the y-axis direction of the positive electrode mixture layer.
`
`in this way,
`
`the positive electrode mixture layer can be arranged inside the non-
`
`peripheral edge portion 436 in plan view, and the distance between the positive electrode
`
`and the negative electrode can be prevented from increasing dueto the peripheral edge
`
`portion 13a.
`
`[0059]
`
`The insulating layer 13 includes a porous layer containing an energy ray-curable resin.
`
`The energy ray-curable resin has excellent adhesion to the electrode mixture layer 12,
`
`sufficient strength, and resistance to an electrolytic solution.
`
`Moreover, it is easy to manufacture, and the manufacturing time can be shortened.
`
`[0060}
`
`The porous layer containing the energy ray-curable resin preferably contains filler
`
`particles.
`
`The strength and dimensional stability of the porous layer containing the energy ray-
`
`curable resin can be improved bythefiller particles.
`
`in addition, the porosity or pore diameter of the porous layer containing the energy ray-
`
`curable resin can be controlled by the filler particles.
`
`The filler particles preferably have electrical insulating properties and heat resistance,
`
`and are stable to the electrolytic solution of the non-aqueous electrolyte secondary
`
`battery and the solvent used in the production process.
`
`Further,
`
`it is preferable that it is not easily oxidized and reduced within the operating
`
`voltage range of the non-aqueous electrolyte secondary battery.
`
`
`
`[0061]
`
`Asthe filler particles, inorganic oxide particles such as iron oxide, silica, alumina, TiO 2
`
`and BaTiO 3 , inorganic nitride particles such as aluminum nitride and silicon nitride,
`
`calcium fluoride, barium fluoride, and barium sulfate can be used. insoluble ionic crystal
`
`particles, covalently bonded crystal particles such as silicon and diamond, clay particles
`
`such as montmorillonite, etc.
`
`The inorganic oxide particles may also be substances derived from mineral resources
`
`such as boehmite, zeolite, apatite, kaolin, mullite, spinel, olivine, and mica, or artificial
`
`products of these substances.
`
`in addition, the surface of a conductive material such as metal, SnO 2 , and ITO, ora
`
`conductive material such as carbon black and graphite may be coated with an electrically
`
`insulating material to have electrical insulating properties.
`
`in addition, two or more of these substances may be mixed.
`
`[0062]
`
`The particle diameter of the filler particles is preferably 0.01 um or more, and more
`
`preferably 0.1 um or more, as an average particle diameter.
`
`Further, the thickness is preferably 5 um or less, more preferably 3 um or less, and
`
`particularly preferably 4 um orless.
`
`The average particle diameter can be defined as, for example, the number average
`
`particle diameter dispersed in a solvent measured using a laser scattering particle size
`
`distribution analyzer.
`
`[0063]
`
`As the energy ray-curable resin, an acrylic resin composed of an acrylic resin monomer
`
`or oligomer and a crosslinking agent, a crosslinked resin composed of a urethane
`
`acrylate and a crosslinking agent, an epoxy acrylate and a crosslinking agent can be
`
`
`
`used The cross-linked resin formed by the linking agent, etc.
`
`Among them, for any of the above-mentioned resins, a divalent or polyvalent acrylic
`
`monomer can be used as a crosslinking agent.
`
`[0064]
`
`Examples of the polymerization initiator for initiating the polymerization reaction include
`
`4-(2-hydroxyethoxyjphenyl(2-hydroxy-2-propyl)ketone, a-hydroxy-a,a’-dimethyl ketone
`
`Acetophenone, 2-methyl-2-hydroxypropiophenone, 1-hydroxycyclohexyl phenyl ketone
`
`and other a-keto alcohol compounds; methoxyacetophenone, 2,2-dimethoxy-2-benzene
`
`acetophenone,
`
`2,2-diethoxyacetophenone,
`
`2-methyl-1-[4-(methylthio)-phenyl]-2-
`
`morpholino-1-propane and other aceiophenones series compounds; benzain ether
`
`series compounds such as benzoin ethyl ether, benzoin isopropyl ether, anisin methyl
`
`ether, etc.; ketal series compounds such as bibenzoyl dimethyl acetal; Acid chloride
`
`compounds; 1-benzophenone-1,1-propanedione-2-(o-ethoxycarbonyl) oxime and other
`
`photoactive
`
`oxime
`
`compounds;
`
`benzophenone,
`
`benzoyibenzoic
`
`acid,
`
`3,3'-
`
`Benzophenone-based
`
`compounds
`
`such
`
`as_
`
`dimethyl-4-methoxybenzophenone;
`
`thioxanthone, 2-chlorothioxanthone, 2-methyithioxanthone, 2,4-dimethylthioxanthone ,
`
`isopropyl
`
`thioxanthone,
`
`2,4-dichlorothioxanthone,
`
`2,4-diethylthioxanthone,
`
` 2,4-
`
`diisopropylthioxanthone
`
`and
`
`other
`
`thioxanthone
`
`compounds;
`
`camphorquinone;
`
`Halogenated ketones; acyl phosphine oxides; acyl phosphonates, etc.
`
`in addition, the above-mentioned polymerization initiators may be used as a mixture of
`
`two or more kinds, if necessary.
`
`{O065]
`
`The insulating layer 13 may contain, in addition to the energy ray-curable resin, a cross-
`
`linked resin derived from an unsaturated polyester resin, a polyfunctional epoxy resin, a
`
`polyfunctional oxetane, or a resin formed from a mixture of these, and a urethaneresin.
`
`Wait.
`
`[0066]
`
`The insulating layer 13 may further contain polyethylene (PE), polypropylene (PP),
`
`
`
`polyolefin copolymers, polyolefin derivatives (chlorinated polyethylene, etc.), styrene
`
`butadiene copolymers, acrylic resins (polymethyl methyl acrylate, etc.), fluororesin, or
`
`derivatives of these substances, or mixtures of these substances.
`
`[0067]
`
`The insulating layer 13 may contain fibers.
`
`The fibers can improve the strength or shape stability of the insulating layer 13 .
`
`The fibrous material may be, for example, cellulose and its modified products, resins
`
`such as polyolefin and polyester, and inorganic oxides such as glass, alumina, and silica.
`
`[0068]
`
`The insulating layer 13 may contain a shutdown resin for imparting so-called shutdown
`
`properties.
`
`The shutdown characteristic refers to the characteristic of stopping the reaction of the
`
`battery by closing the pores of the insulating layer 13 when abnormal heat generation
`occurs.
`
`As the shutdown resin, for example, thermoplastic resins such as polyethylene and
`
`polypropylene that are melied at a certain temperature, and resins such as cross-linked
`
`products of polymethyl methacrylate that are swelled by absorbing an electrolytic solution
`
`by heating can be used.
`
`[0069]
`
`[Manufacturing method of electrode for non-aqueous electrolyte secondary battery]
`
`[0070]
`
`Hereinafter, an example of the manufacturing method of the electrode 1 for non-aqueous
`
`electrolyte secondary batteries is demonstrated.
`
`
`
`The method for producing the electrode 1 for a non-aqueous electrolyte secondary
`
`battery according to the present embodiment includes (A) a step of forming the electrode
`
`mixture layer 12 on the current collector 11 , and (B) coating the entire surface of the
`
`electrode mixture layer 12 The step of making the slurry for the insulating layer 13 , and
`
`(C) the step of re-coating the slurry only on the peripheral portion of the electrode mixture
`
`layer 12 so that the thickness of the insulating layer 13 is thicker than other portions.
`
`[007 4}
`
`First, (A) the electrode mixture layer 12 is formed on the current collector 11 .
`
`in order to form the electrode mixture layer 12 , an active material, a binder, a conductive
`
`auxiliary agent added as needed, and the like are mixed in a solvent to prepare a slurry.
`
`[0072]
`
`The obtained slurry was applied to the current collector 77.
`
`The coating method of the slurry is not particularly limited, for example, a die coater can
`
`be used.
`
`At this time,
`
`in order to form the exposed portion 11a on the current collector 11, the
`
`slurry was not applied to a part of the current collector 17.
`
`Alternatively, after the slurry is applied to the entire surface of the current collector 11, a
`
`part of the applied slurry may be removed to form the exposed portion 11a.
`
`[0073]
`
`After drying the applied slurry to remove the solvent, calendering is performed to adjust
`
`the density to a predetermined value.
`
`in this way, the electrode mixture layer 12 is formed.
`
`The thickness of the electrode mixture layer 12 is not particularly limited, and may be,
`
`for example, 20 to 200 um perside.
`
`
`
`[0074]
`
`Subsequently, (B} on the entire surface of the electrode mixture layer 12, a paste to be
`
`the insulating layer 13 is applied.
`
`in order to form the insulating layer 13, monomers, cligomers, and cross-linking agents
`
`of the energy ray-curable resin, and other resins, filler particles, fibrous materials, and
`
`shutdown resins added as needed are mixed in a solvent to prepare slurry.
`
`[0075]
`
`The solvent is preferably one that can dissolve monomers, oligomers, cross-linking
`
`agents, polymerization initiators, and the like of the energy ray-curable resin, and that
`
`can uniformly disperse thefiller particles.
`
`As the solvent, for example, aromatic hydrocarbons such as toluene, furans such as
`
`tetrahydrofuran, and ketones such as methyl ethyl ketone (MEK) can be used.
`
`[0076]
`
`Whendispersingthe filler particles in the slurry, a dispersant may be added as necessary.
`
`Examples of the dispersing agent include silicone-based, amine-based, anionic-based,
`
`cationic-based, nonionic-based, and polymer-based surfactants.
`
`Moreover, the said dispersing agent can also mix and use 2 or more types as needed.
`
`[0077]
`
`The prepared slurry is applied on the entire surface of the electrode mixture layer 12 .
`
`The coating thickness is adjusted so that the thickness after curing of the resin will be
`
`the thickness d2.
`
`The coating methodis not particularly limited, and for example, a die coater and a sprayer
`
`
`
`can be used.
`
`[0078]
`
`The coating of the slurry can also be performed with a dip coater.
`
`That is, the current collector 11 having the electrode mixture layer 12 formed thereon is
`
`immersed in the slurry so that the entire electrode mixture layer 12 is immersed, and
`
`pulled up at a predetermined speed.
`
`The coating thickness can be adjusted by the viscosity of the slurry and the speed of
`
`pulling.
`
`[0079]
`
`The applied slurry is irradiated with energy rays, and if necessary, heated or dried to cure
`the resin.
`
`in this way, an insulating film having a uniform thickness d2 is formed on the electrode
`
`mixture layer 12.
`
`[0080}
`
`Then, (C) the slurry prepared in the above step is applied again only to the peripheral
`
`portion of the electrode mixture layer 12.
`
`The coating of the slurry only on the peripheral portion of the electrode mixture layer 12
`
`can be performedby, for example, a spraying machine or a coating method using a mask.
`
`[0081]
`
`The coating of this slurry can also be performed using a dip coater.
`
`That is, from the four sides of the current collector 11 on which the electrode mixture
`
`layer 12 was formed, each side was immersedin the slurry only to a predetermined depth,
`
`and pulled up at a predetermined speed.
`
`
`
`More specifically, in FIG.
`
`1
`
`, the side on the negative side in the x-axis direction of the
`
`electrode 1 for a non-electrolyte secondary battery is immersed in the slurry only at a
`
`depth substantially the same as the width f1.
`
`Similarly, the side on the positive side in the x-axis direction is immersed in the slurry
`
`only to a depth substantially the same as the width t2.
`
`The side on the negative side in the y-axis direction is immersed in the slurry only ata
`
`depth substantially the same as the width f3.
`
`Then, the side on the positive side in the y-axis direction is immersed in the slurry only
`
`to a depth substantially equal to the total value of the size of the exposed portion 41a in
`
`the y-axis direction and the width ts.
`
`At this time, the slurry is also applied to the exposed portion 11a, and it may be removed
`before or after the resin is cured.
`
`[0082]
`
`The applied slurry is irradiated with energy rays and, if necessary, heated or dried to cure
`
`the resin.
`
`in this way, the thickness d7 of the peripheral edge portion 13a becomes thicker than
`
`the thickness d2 of the non-peripheral edge portion 13b.
`
`in this way, the insulating layer 13 covering the surface of the electrode mixture layer 12
`is formed.
`
`[0083]
`
`in the method for producing the electrode 1 for a non-aqueous electrolyte secondary
`
`battery according to the present embodiment, the electrode mixture layer 12 and the
`
`insulating layer 13 may be formed on the current collector 11 cut to a predetermined size
`
`in advance; After the electrode mixture layer 12 and the insulating film 13 are formed on
`
`the current collector 11, they are cut to a predetermined size.
`
`
`
`The latter method is more excellent in mass productivity.
`
`[0084]
`
`Alternatively, the electrode mixture layer 12 may be formed on the strip-shaped current
`
`collector 11, and the insulating layer 13 may be formed after cutting it
`
`into a
`
`predetermined size.
`
`Alternatively, the electrode mixture layer 12 may be formed on the strip-shaped current
`
`collector 11 , the first application of the slurry to be the insulating layer 13 may be
`
`performed, and the slurry may be cut into a predetermined size, followed by the second
`
`application of the slurry. The insulating layer 13 is formed by secondary coating.
`
`[0085]
`
`That is,
`
`in the
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