Title:
PROCESS FOR PRODUCING POSITIVE-ELECTRODE ACTIVE MATERIAL FOR LITHIUM SECONDARY CELL
Document Type and Number:
WIPO Patent Application WO/2004/088776
Kind Code:
A1
Abstract:
A process for producing a lithium/cobalt composite oxide for positive electrodes for lithium secondary cells from cobalt hydroxide and lithium carbonate, which are inexpensive. The lithium/cobalt composite oxide produced is excellent in volume density, safety, durability in charge/discharge cycling, density after pressing, and productivity. A mixture obtained by mixing a cobalt hydroxide powder with a lithium carbonate powder in such a proportion so as to result in a lithium/cobalt atomic ratio of from 0.98 to 1.01 is burned at 250 to 700°C in an oxygenic atmosphere. The product of burning is further burned at 850 to 1,050°C in an oxygenic atmosphere, or is heated at a rate of 4 °C/min or less with respect to heating from 250 to 600°C and then burned at 850 to 1,050°C in an oxygenic atmosphere.
Inventors:
SUHARA MANABU (JP)
SAITO NAOSHI (JP)
HORICHI KAZUSHIGE (JP)
TATSUMI KOJI (JP)
SAITO NAOSHI (JP)
HORICHI KAZUSHIGE (JP)
TATSUMI KOJI (JP)
Application Number:
PCT/JP2004/004603
Publication Date:
October 14, 2004
Filing Date:
March 31, 2004
Export Citation:
Assignee:
SEIMI CHEM KK (JP)
SUHARA MANABU (JP)
SAITO NAOSHI (JP)
HORICHI KAZUSHIGE (JP)
TATSUMI KOJI (JP)
SUHARA MANABU (JP)
SAITO NAOSHI (JP)
HORICHI KAZUSHIGE (JP)
TATSUMI KOJI (JP)
International Classes:
C01G51/00; C01G51/04; H01M4/525; H01M4/60; H01M4/62; H01M10/05; H01M4/36; H01M6/16; (IPC1-7): H01M4/58; C01G51/00; H01M4/02; H01M10/40
Foreign References:
| JP2001291507A | 2001-10-19 | |||
| JPH11292549A | 1999-10-26 | |||
| JP2002321921A | 2002-11-08 |
Attorney, Agent or Firm:
Senmyo, Kenji (38 Kanda-Higashimatsushitacho, Chiyoda-k, Tokyo, JP)
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