Electrode active material electrode lithium-ion secondary battery method of making electrode active material and method of making lithium-ion secondary battery
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United States of America Patent
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Issued Date -
Apr 15, 2004
app pub date -
Jul 18, 2003
filing date -
Nov 20, 2001
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Abandoned
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Abstract
The positive electrode active material in accordance with the present invention is used for a positive electrode for a lithium-ion secondary battery, includes Li, Mn, Ni, Co, and O atoms, and has a substantially halite type crystal structure. Specifically, it is preferably expressed by Li.sub.aMn.sub.bNi.sub.cCo.sub.dO.sub.e, where a is 0.85 to 1.1, b is 0.2 to 0.6, c is 0.2 to 0.6, d is 0.1 to 0.5, and e is 1 to 2 (the sum of b, c, and d being 1). Because of such composition and crystal structure, the positive electrode active material of the present invention reduces the amount of elution of the battery into the liquid electrolyte and enhances the stability at a high temperature.
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