Title:
SECONDARY LITHIUM BATTERY ELECTROLYTE
Document Type and Number:
Japanese Patent JP3244017
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide a battery which has good cycle characteristics and has good battery characteristics such as the electric capacity or storage stability, by setting an alcohol group in electrolyte to specific concentration.
SOLUTION: In secondary lithium battery electrolyte which contains nonaqueous solvent and fluorine-containing electrolyte which can release lithium ions, concentration of an alcohol group in the nonaqueous solvent is less than 50 ppm. It is preferable that concentration of the diol group is less than 20 ppm, and that of a mono-alcohol group is less than 30 ppm. The diol group is ethylene glycol and/or diethylene glycol, propylene glycol, or dipropylene glycol, and mono-alcohol group is methanol and/or ethanol, propanol, or buthanol. The nonaqueous solvent preferably consists of high-permittivity solvent such as ethylene carbonate and low-viscosity solvent such as diethyl carbonate.
Inventors:
Shunichi Hamamoto
Atsuo Hidaka
Koji Abe
Yousuke Ueno
Noriyuki Ohira
Masahiko Watanabe
Atsuo Hidaka
Koji Abe
Yousuke Ueno
Noriyuki Ohira
Masahiko Watanabe
Application Number:
JP7223497A
Publication Date:
January 07, 2002
Filing Date:
March 25, 1997
Export Citation:
Assignee:
Ube Industries,Ltd.
International Classes:
H01M10/05; H01M10/052; H01M10/0567; H01M10/0568; H01M10/0569; (IPC1-7): H01M10/40
Domestic Patent References:
| JP574485A | ||||
| JP5981869A | ||||
| JP61284062A | ||||
| JP8325208A | ||||
| JP5226004A | ||||
| JP10116631A | ||||
| JP10270076A |