NONAQUEOUS ELECTROLYTE SECONDARY BATTERY - Sanyo Electric Co., Ltd.

Title:

NONAQUEOUS ELECTROLYTE SECONDARY BATTERY

Document Type and Number:

Japanese Patent JP3423169

Kind Code:

B2

Abstract:

PROBLEM TO BE SOLVED: To retard the reaction of an electrode material with a nonaqueous electrolyte, suppress drop in cycle characteristics, suppress self discharge, and lengthen the storage life by constituting the electrode material with a disordered material and an ordered material having long distance order.
SOLUTION: An electrode material has structure selected from amorphous, microcrystalline, or polycrystalline structure lacking in long distance order, or combination structure of them, and is constituted with a disordered material and an ordered material having long distance order. Crystal edges reacting with an electrolyte are decreased compared with a negative material comprising ordered material having long distance order, and reaction with the electrolyte on the edge surface is suppressed. As a material capable of electrochemically absorbing/releasing an alkali metal ion, for example natural graphite with low crystallinity is used. A nonaqueous electrolyte prepared by dissolving lithium hexafluorophosphate as a solute in an equal volume mixture of ethylene carbonate and diethyl carbonate is used.

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Inventors:

Masahisa Fujimoto
Toshiyuki Noma
Koji Nishio

Application Number:

JP30965196A

Publication Date:

July 07, 2003

Filing Date:

November 20, 1996

Export Citation:

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Assignee:

Sanyo Electric Co., Ltd.

International Classes:

H01M4/36; H01M4/48; H01M4/525; H01M4/58; H01M4/587; H01M10/05; H01M10/052; H01M10/0566; (IPC1-7): H01M4/58; H01M4/02; H01M4/04; H01M10/40

Domestic Patent References:

JP10106544A
JP1092432A
JP6168721A
JP850895A
JP883606A
JP6260167A
JP620690A
JP554909A
JP6119923A
JP7326343A
JP6333558A
JP684516A
JP1074515A
JP927316A
JP9326253A
JP9245794A

Attorney, Agent or Firm:

Masamasa Shibano

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