SECONDARY CELL WITH NONAQUEOUS ELECTROLYTE AND PROCESS FOR PREPARING POSITIVE ACTIVE MATERIAL THEREFOR

WIPO Patent Application WO/1999/001903

A1

A positive active material which forms a laminate with a negative electrode via a separator, the laminate being then spirally wound to form a group of electrodes. The active material comprises a lithium-metal composite oxide prepared by mixing at least one compound selected from among hydroxides, oxides, and carbonates of at least one metal selected from among transition metals, group IIA metals, and group IIIA metals with a lithium compound having a D¿50? of 5 to 50 $g(m)m and a D¿90? of not more than 90 $g(m)m and not containing particles having a diameter of not less than 100 $g(m)m, firing the mixture at 700 to 1000 °C for 2 to 30 hr, and pulverizing the same. The use of this material serves to improve the discharge capacity and cycle characteristics of a secondary cell with a nonaqueous electrolyte.

KAWANO TOMOKO (JP)
KOBAYASHI SHIGEO (JP)
WATANABE SHOICHIRO (JP)
FUJIWARA TAKAFUMI (JP)
HASHIMOTO AKIRA (JP)
SYOJI YASUHIKO (JP)

PCT/JP1998/002955

January 14, 1999

June 30, 1998

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MATSUSHITA ELECTRIC IND CO LTD (JP)
KAWANO TOMOKO (JP)
KOBAYASHI SHIGEO (JP)
WATANABE SHOICHIRO (JP)
FUJIWARA TAKAFUMI (JP)
HASHIMOTO AKIRA (JP)
SYOJI YASUHIKO (JP)

H01M10/05; C01B31/04; C01G51/00; C01G55/00; H01M4/04; H01M4/36; H01M4/48; H01M4/485; H01M4/50; H01M4/505; H01M4/52; H01M4/525; H01M10/0525; H01M10/36; H01M4/131; H01M4/133; H01M10/0587; (IPC1-7): H01M4/58; H01M4/02; H01M4/04; H01M10/40

JPH05290832A	1993-11-05
JPH08153513A	1996-06-11
JPH08185861A	1996-07-16
JPH1027613A	1998-01-27
JPH06342657A	1994-12-13
JPH07230808A	1995-08-29
JPH08138672A	1996-05-31

See also references of EP 0929111A4

Takimoto, Tomoyuki (1006, Oaza Kadom, Kadoma-shi Osaka, JP)

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