リチウム二次電池及びその初期活性化方法

Title:

リチウム二次電池及びその初期活性化方法

Document Type and Number:

Japanese Patent JP4811697

Kind Code:

B2

Abstract:

To provide a structure and its initial activation method for improving a preservation property of a lithium secondary battery used at an upper limit voltage of 4.3 V or higher.

The battery comprises a positive electrode containing a positive electrode active material capable of storing/releasing lithium ions; a negative electrode containing a negative electrode active material capable of storing/releasing lithium ions; a nonaqueous electrolyte; and a separator; and used at an upper limit voltage of not lower than 4.3 V and not higher than 4.6 V. The positive electrode active material is a lithium-transition metallic compound having an α-NaFeO2type layered structure and the nonaqueous electrolyte contains vinylene carbonate. Further, the initial activation method of the lithium secondary battery performs constant voltage charging within a range of not lower than 4.3 V and not higher than 4.6 V within a time span of not shorter than 10 hours and not longer than 500 hours at the initial charging.

Inventors:

Akihiro Fujii
Ryuji Shiozaki
Toshiyuki Atsuta

Application Number:

JP2003432151A

Publication Date:

November 09, 2011

Filing Date:

December 26, 2003

Export Citation:

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Assignee:

Gs Yuasa Co., Ltd.

International Classes:

C01G51/00; H01M10/0567; C01G53/00; H01M4/505; H01M4/525; H01M10/05; H01M10/052; H01M10/0525; H01M10/058

Domestic Patent References:

JP2003264006A
JP2002093405A
JP2003109593A
JP2005158285A
JP2005149867A
JP2002237293A

Foreign References:

WO2003019713A1

Attorney, Agent or Firm:

Satoru Matsumoto

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