Title:
LITHIUM SECONDARY CELL
Document Type and Number:
Japanese Patent JP3408250
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide a lithium secondary cell with small self-discharging ratio, excellent cycle property, and high charge-discharge efficiency.
SOLUTION: The lithium secondary cell comprises a positive pole containing a compound enabled to occlude and release lithium as a main material; a negative pole containing graphite of which, the length of crystal grain Lc in the direction of c axis at X-ray diffraction is 150 &angst or more (provided that the grain with the length of crystal grain Lc in the direction of c axis at X-ray diffraction of less than 300 &angst is excluded) as a maim material; a separator installed between those positive and negative poles; and an electrolyte liquid with an electrolyte solute dissolved in a solvent. At least one solvent chosen from ethylene carbonate, γ-butyrolactone, γ-thiobutyrolactone, γ- valerobutyrolactone, γ-ethyl-γ-butyrolactone, β-methyl-γ-butyrolactone, tetrahydrofurane, 3-methyltetrahydrofurane, sulfolane, 3-methylsulfolane, 2- methylsulfolane, 3-ethylsulfolane, 2-ethylsulfolane, thiolane, α-pyrrolidone, pyrazolidine, pyrrolidine, dimethyl carbonate, diethyl carbonate, 1,2- dimethoxyethane, 1,2-diethoxyethane, or ethoxymethoxyethane is dissolved in the electrolyte liquid.
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Inventors:
Masahisa Fujimoto
Nobuyuki Yoshinaga
Koji Ueno
Nobuhiro Furukawa
Toshiyuki Noma
Masatoshi Takahashi
Nobuyuki Yoshinaga
Koji Ueno
Nobuhiro Furukawa
Toshiyuki Noma
Masatoshi Takahashi
Application Number:
JP2001213909A
Publication Date:
May 19, 2003
Filing Date:
December 27, 1991
Export Citation:
Assignee:
Sanyo Electric Co., Ltd.
International Classes:
H01M10/05; H01M4/587; H01M10/0525; H01M10/0568; H01M10/0569; (IPC1-7): H01M10/40; H01M4/02; H01M4/58
Domestic Patent References:
| JP4337247A | ||||
| JP528996A | ||||
| JP38270A | ||||
| JP2172162A | ||||
| JP642258A | ||||
| JP5996666A | ||||
| JP63102166A | ||||
| JP63121260A |
Attorney, Agent or Firm:
Katsuaki Matsukawa