Title:
Quality for nonaqueous system electrolyte rechargeable batteries of cathode active material, its manufacturing method, and a nonaqueous system electrolyte rechargeable battery using the quality of cathode active material
Document Type and Number:
Japanese Patent JP6210439
Kind Code:
B2
Abstract:
Provided is a method for producing a positive electrode active material for nonaqueous electrolyte secondary batteries, including: a water-washing step of mixing, with water, Li—Ni composite oxide particles represented by the formula: LizNi1-x-yCoxMyO2 and composed of primary particles and secondary particles formed by aggregation of the primary particles to water-wash it, and performing solid-liquid separation to obtain a washed cake; a mixing step of mixing a W compound powder free from Li with the washed cake to obtain a W-containing mixture; and a heat treatment step of heating the W-containing mixture, the heat treatment step including: a first heat treatment step of heating the W-containing mixture to disperse W on the surface of the primary particles; and subsequently, a second heat treatment step of heating it at a higher temperature than in the first heat treatment step to form a lithium tungstate compound on the surface of the primary particles.
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Inventors:
Kentaro Kondo
Jun Yokoyama
Furuichi Yuki
Tetsushi Komukai
Jun Yokoyama
Furuichi Yuki
Tetsushi Komukai
Application Number:
JP2015212403A
Publication Date:
October 11, 2017
Filing Date:
October 28, 2015
Export Citation:
Assignee:
Sumitomo Metal Mining Co., Ltd.
International Classes:
H01M4/525; C01G41/00; C01G53/00; H01M4/36; H01M4/505
Domestic Patent References:
| JP2010040383A | ||||
| JP2013152866A | ||||
| JP2013125732A | ||||
| JP2013137947A |
Attorney, Agent or Firm:
Yoshitaka Oshida