METHOD FOR PRODUCING LITHIUM TRANSITION METAL OXIDE

WIPO Patent Application WO/2011/002074

A1

Disclosed is a novel method for producing a lithium transition metal oxide, which is capable of increasing the crystallite size, while suppressing oxygen defects. Specifically disclosed is a method for producing a lithium transition metal oxide, which comprises a step of mixing starting materials, a firing step, and a heat treatment step, and which is characterized in that the starting materials are fired in an atmosphere having an oxygen partial pressure of from 0.015 MPa to 0.15 MPa at a temperature not less than 850°C, and then the resulting material is heat-treated in an atmosphere having an oxygen partial pressure of not less than 0.03 MPa at a temperature that is the primary oxygen release temperature ± 50°C. Since the method is capable of suppressing oxygen defects while increasing the crystallite size, the strain is reduced and the lithium transition metal oxide has a strong skeleton. Consequently, when the lithium transition metal oxide is used as a positive electrode active material for a lithium secondary battery, the lithium secondary battery is able to have adequate output characteristics and adequate high-temperature cycle life characteristics at the same time.

JP3661183	ACTIVE MATERIAL FOR POSITIVE ELECTRODE OF NONAQUEOUS ELECTROLYTE SECONDARY BATTERY AND ITS PRODUCING METHOD
JP4222093	Composite oxide particles, their manufacturing methods, active materials for secondary batteries and secondary batteries
WO/1999/052825	LITHIUM BATTERY OPERATING BETWEEN 1.8 VOLTS AND 4.3 VOLTS

KAGEI SHINYA (JP)
MIYANOHARA KEISUKE (JP)
HATA YOSHIMI (JP)
OCHI YASUHIRO (JP)
MITSUMOTO TETSUYA (JP)

PCT/JP2010/061308

January 06, 2011

July 02, 2010

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MITSUI MINING & SMELTING CO (JP)
KAGEI SHINYA (JP)
MIYANOHARA KEISUKE (JP)
HATA YOSHIMI (JP)
OCHI YASUHIRO (JP)
MITSUMOTO TETSUYA (JP)

C01G45/00; C01G49/00; C01G51/00; C01G53/00; H01M4/505

JP2000211922A	2000-08-02
JPH09259880A	1997-10-03
JP2002075355A	2002-03-15
JP2002175805A	2002-06-21
JP2002316823A	2002-10-31
JP2006252940A	2006-09-21
JP2001335323A	2001-12-04
JP2007149414A	2007-06-14

TAKEUCHI, ICHIZAWA & ASSOCIATES (JP)
Patent business corporation Takeuchi and an Ichizawa international patent firm (JP)

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