PESL-115US
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`-23-
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`ABSTRACT
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`A lithium secondary battery comprises a negative electrode, a positive
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`electrode comprising a current collector, an active cathode material comprising a
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`lithium transition metal complex oxide coated on the current collector, and Si1_XGeXOY
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`(OSXS 1, OSY<2), and an electrolyte comprising at least one lithium salt and at least
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`one solvent. The positive electrode comprising Si1_XGeXOY (OSXS 1, OSY<2)
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`generates less heat relative to a positive electrode without Si1_XGeXOY (OSXS 1,
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`OSY<2) throughout a state of overcharge. A method of preparing the positive
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`electrode includes coating a current collector with the active cathode material, drying
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`10
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`and calendaring the coated current collector to form the positive electrode, and
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`depositing a calcinated mixture comprising Si1_XGeXOY (OSXS 1, OSY<2) on the
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`positive electrode.
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