LITHIUM SECONDARY CELL

WIPO Patent Application WO/2001/037364

A1

A lithium secondary cell having a positive electrode (1), a negative electrode (2) containing graphite as a negative electrode active material, and a non-aqueous electrolytic solution, characterized in that in ?7¿Li-NMR measurement of the negative electrode active material in the state of being fully charged, the ratio (I2/I1) of the peak intensity (I2) at about 266 ppm (corresponding to the Li deposited on the surface of the graphite) to the peak intensity (I1) at about 43 ppm (corresponding to the Li inserted between layers of graphite) is in the range of 0 < I2/I1 < 0.5. It is preferred that the solute of the non-aqueous electrolytic solution contains LiPF¿6? and LiN(C¿2?F¿5?SO¿2?)¿2?, and that the solvent of the solution contains a 5- or 6-membered heterocyclic compound having at least one of O, S and N. The lithium secondary cell exhibits enhanced charge and discharge capacities and improved charge storing characteristics.

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YOSHIDA TOSHIKAZU (JP)
OHSHITA RYUJI (JP)
KAMINO MARUO (JP)
FUJITANI SHIN (JP)

PCT/JP2000/007650

May 25, 2001

October 30, 2000

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SANYO ELECTRIC CO (JP)
YOSHIDA TOSHIKAZU (JP)
OHSHITA RYUJI (JP)
KAMINO MARUO (JP)
FUJITANI SHIN (JP)

H01M10/05; H01M4/133; H01M4/587; H01M10/052; H01M10/0567; H01M10/0568; H01M6/16; (IPC1-7): H01M10/40

EP0573266A1	1993-12-08
EP0886334A1	1998-12-23
JPH11283667A	1999-10-15
JPH09312171A	1997-12-02
JPH11111332A	1999-04-23

Metsugi, Makoto (Tanimachi 1-chome Chuo-ku Osaka-shi, Osaka, JP)

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