POSITIVE ELECTRODE ACTIVE MATERIAL FOR NONAQUEOUS ELECTROLYTE SECONDARY BATTERIES, METHOD FOR PRODUCING SAME, POSITIVE ELECTRODE MIXTURE PASTE FOR NONAQUEOUS ELECTROLYTE SECONDARY BATTERIES, AND NONAQUEOUS ELECTROLYTE SECONDARY BATTERY

WIPO Patent Application WO/2017/199891

A1

The purpose of the present invention is to provide a positive electrode active material for nonaqueous electrolyte secondary batteries, which is capable of suppressing gelation of a positive electrode mixture paste during the production of a nonaqueous electrolyte secondary battery, thereby improving the stability of the paste. A positive electrode active material which contains secondary particles that are represented by general formula LisNi1-x-y-zCoxMnyMzO2+α (wherein 0 ≤ x ≤ 0.35, 0 ≤ y ≤ 0.35, 0 ≤ z ≤ 0.10, 0.95 < s < 1.30, 0 ≤ α ≤ 0.2 and M represents at least one element selected from among V, Mg, Mo, Nb, Ti, W and Al), each one of said secondary particles being formed of aggregated primary particles, and wherein: at least a part of the surface of each primary particle is covered by a lithium boron compound; and the excess lithium hydroxide in the positive electrode active material as determined by a neutralization titration method is from 0.003% by mass to 0.5% by mass (inclusive) relative to the whole positive electrode active material.

SARUWATARI MOTOAKI (JP)
RYOSHI KAZUOMI (JP)

PCT/JP2017/018105

November 23, 2017

May 12, 2017

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SUMITOMO METAL MINING CO (JP)

H01M4/525; C01G53/00; H01M4/131; H01M4/1391; H01M4/36; H01M4/505

WO2016017074A1	2016-02-04
WO2013021955A1	2013-02-14
WO2017073238A1	2017-05-04

JP2015099767A	2015-05-28
JP2013239434A	2013-11-28
JP2004335278A	2004-11-25
JP2015201431A	2015-11-12

NISHI, Kazuya et al. (JP)

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