Toda Kogyo Corporation

Masaki Nishimura

Hideaki Sadamura

Teruaki Santoki

Kazutoshi Ishizaki

Kazuhiko Kikuya

Yuji Mishima

Takahiko Sugihara

Takamitsu Harada

The present invention relates to Li-Ni composite oxide particles that exhibit a high initial discharge capacity and are excellent in thermal stability when used as a positive electrode active substance for non-aqueous electrolyte secondary batteries, and a process for producing the Li-Nicomposite oxide particles. The Li-Ni composite oxide particles of the present invention have a composition of LiNiCoM1M2Owherein x, y, a and b represent 1.00&#x2266;x&#x2266;1.10; 0&#x3c;y&#x2266;0.25; 0&#x3c;a&#x2266;0.25; and 0&#x2266;b&#x2266;0.10, respectively; M1 is at least one element selected from the group consisting of Al and Mn; and M2 is at least one element selected from the group consisting of Zr and Mg, in which a product of a metal occupancy (%) of lithium sites of the Li-Ni composite oxide as determined by Rietveld analysis of X-ray diffraction thereof and a crystallite size (nm) of the Li-Ni composite oxide as determined by the Rietveld analysis is not less than 700 and not more than 1400.

Li-Ni composite oxide particles and process for producing the same, and non-aqueous electrolyte secondary battery

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Sanyoonoda, Japan

Masaki Nishimura