POSITIVE ELECTRODE ACTIVE MATERIAL AND NONAQUEOUS ELECTROLYTE SECONDARY BATTERY

Japanese Patent JP3430058

B2

PROBLEM TO BE SOLVED: To provide a nonaqueous electrolyte secondary battery with less deteriorated charging/discharging characteristics even when used under high temperature conditions using inexpensive manganese oxides for a positive active material.
SOLUTION: This positive active material has a manganese oxide particle mainly containing a manganese oxide and an elution suppressing layer of a non-polymer film covering the manganese oxide particle for suppressing elution of a manganese. This nonaqueous electrolyte secondary battery has the positive active material in a positive electrode. A nonaqueous electrolyte (an electrolyte solution, for example) is not brought into contact with a manganese element highly active by blocking the elution suppressing layer so that the nonaqueous electrolyte is prevented from being electrolyzed by the manganese. A negative electrode is not badly affected by eluting the manganese from the positive active material. Therefore, this nonaqueous electrolyte secondary battery can maintain large discharging capacity even if stored or charged/discharged under high temperature conditions for a long time and deterioration of charging/ discharging characteristics is reduced.

Satoru Suzuki
Masaya Nakamura
Jun Hasegawa
Koichi Numata
Shintaro Ishida

JP3109199A

July 28, 2003

February 09, 1999

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株式会社デンソー
三井金属鉱業株式会社

H01M10/05; H01M4/02; H01M4/131; H01M4/36; H01M4/485; H01M4/505; H01M10/052; (IPC1-7): H01M4/50; H01M4/02; H01M4/58; H01M10/40

JP8162114A
JP8222219A
JP9115514A
JP4329267A
JP6111819A
JP7288127A
JP8250120A
JP11185758A
JP2000133272A
JP200090915A

【文献】国際公開97/023918(WO,A1)

Hiroshi Ohkawa

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