NEGATIVE ELECTRODE FOR LITHIUM SECONDARY BATTERY AND LITHIUM SECONDARY BATTERY USING THE SAME

Japanese Patent JP3609612

B2

PROBLEM TO BE SOLVED: To increase discharge capacity and enhance cycle characteristics by including a carbon material and at least one of oxides of silicon, germanium, and tin.
SOLUTION: As an oxide, lithium-containing silicon oxide, lithium-containing germanium oxide, and lithium-containing tin oxide are preferable. As a carbon material, carbon having a spacing of (002) planes as determined by X-ray diffraction of 3.39 &angst or smaller and a crystallite size in the direction of C axis of 300 &angst or larger is desirable as the main material of a negative electrode. The particle size of the oxide is 1-10 μm. The oxide is mixed to the carbon negative material in the range of 1-10 wt%. The oxide and the carbon material are kneaded together with a binder, such as polytetrafluoroethylene or polyvinylidene fluoride, and used as a mix. As a solvent constituting an electrolyte, ethylene carbonate, propylene carbonate, or the like can be used. As an electrolyte salt, lithium hexafluorophosphate is stable and superior.

Katsutoshi Yanagita
Atsushi Yanai
Ikuro Yonezu
Koji Nishio

JP11850398A

January 12, 2005

April 28, 1998

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Sanyo Electric Co., Ltd.

H01M10/05; H01M4/133; H01M4/36; H01M4/48; H01M4/485; H01M4/587; (IPC1-7): H01M4/48; H01M4/02; H01M4/58; H01M10/40

JP3349373B2
JP11204105A
JP10326621A
JP11185757A
JP10189043A
JP6325765A
JP9293490A
JP7192723A
JP10189043A
JP11283670A

Katsuaki Matsukawa
Masamasa Shibano

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