Title:
リチウム二次電池
Document Type and Number:
Japanese Patent JP4878690
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide a lithium secondary battery wherein the mixing amount of a positive electrode active material is optimized even if a mixture positive electrode active material in which lithium cobalt compound is mixed with spinel type lithium manganate is used, while the mass ratio between the mixture positive electrode active material and a negative electrode active material is optimized, for improved discharge capacity and cycle characteristics. SOLUTION: Related to the positive electrode, a positive electrode mixture whose main component is a mixture positive electrode active material in which lithium cobalt compound is mixed with spinel type lithium manganate is held by a positive electrode collector. The mass ratio (B/A) between a mass A of positive electrode active material and mass B of negative electrode active material is regulated to be within the range of 0.15X+0.263<=B/A<=0.11X+0.41, where A is mass of the positive electrode active material per a unit area of the positive electrode, B is mass of the negative electrode active material per a unit area of the negative electrode, and X is mass ratio of lithium cobalt compound in the mixture positive electrode active material.
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Inventors:
Takuya Sunagawa
Yoshihisa Miyamoto
Masatoshi Takahashi
Yoshihisa Miyamoto
Masatoshi Takahashi
Application Number:
JP2001084751A
Publication Date:
February 15, 2012
Filing Date:
March 23, 2001
Export Citation:
Assignee:
Sanyo Electric Co., Ltd.
International Classes:
H01M10/05; H01M10/0525; H01M4/131; H01M4/133; H01M4/36; H01M4/505; H01M4/525
Domestic Patent References:
| JP11086845A | ||||
| JP2000100431A | ||||
| JP2000306577A |
Attorney, Agent or Firm:
Takamori Suzuki
Yasuo Asami
Hideo Takahashi
Yoshitaka Takeyama
Yasuo Asami
Hideo Takahashi
Yoshitaka Takeyama