Positive electrode active material for nonaqueous electrolyte secondary batteries, and production method thereof

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United States of America Patent

PATENT NO 10854873
APP PUB NO 20180047977A1
SERIAL NO

15555597

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ATTORNEY / AGENT: (SPONSORED)

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Abstract

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A method for producing a positive electrode active material for nonaqueous electrolyte secondary batteries, includes: a mixing step of adding a W compound powder having a solubility A adjusted to 2.0 g/L or less to a Li-metal composite oxide powder and stirring in water washing of the composite oxide powder, the solubility A being determined by stirring the W compound in water having a pH of 12.5 at 25° C. for 20 minutes, the composite oxide powder being represented by the formula:

description='In-line Formulae' end='lead'LicNi1-x-yCoxMyO2 description='In-line Formulae' end='tail'

and composed of primary and secondary particles, followed by solid-liquid separation, to thereby obtain a tungsten-containing mixture with the tungsten compound dispersed in the composite oxide powder; and a heat-treating step of heat-treating the mixture to uniformly disperse W on the surface of primary particles and thereby form a compound containing W and Li from the W and Li in the mixture, on the surface of primary particles.

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Patent Owner(s)

  • SUMITOMO METAL MINING CO. LTD.

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Furuichi, Yuki Niihama, JP 14 80
Komukai, Tetsufumi Niihama, JP 34 115

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