Toda Kogyo Corporation

Yuji Mishima

Hideaki Sadamura

Tsutomu Katamoto

Seiji Okazaki

Haruki Kurokawa

Hidetomo Unemoto

Manabu Matsumoto

Tadashi Kanasaku

Kazuyoshi Murashige

Teruaki Santoki

Kazutoshi Ishizaki

Hiroshi Yamamoto

Toshiharu Harada

Kazuhiko Kikuya

Takahiko Sugihara

Ryuji Fujita

Shingo Honda

Koichiro Kanda

Masaki Nishimura

Takamitsu Harada

Takahisa Nishio

Kouta Sato

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

The fine barium titanate particles of the present invention have an average primary particle diameter of from 10 nm to less than 20 nm, a sphericity of 1.00 to 1.18, and a ratio of an average secondary particle diameter to the average primary particle diameter of 0.7 to 6.0. The fine barium titanate particles of the present invention can exhibit a small behavior particle diameter and can be readily monodispersed notwithstanding very fine particles, and as a result, can be suitably used as various dielectric materials because the particles are free from aggregation therebetween and have an excellent dispersibility.

Fine barium titanate particles

Spherical tetragonal barium titanate particles of the present invention have a perovskite crystal structure, an average particle diameter of 0.05 to 0.5 &#x3bc;m, a particle size distribution &#x3c3;g of not less than 0.70, and a ratio of Ba to Ti of 0.99:1 to 1.01:1. The spherical tetragonal barium titanate particles exhibit an excellent dispersibility as well as a high denseness, a high purity and excellent permittivity properties.

Coated spherical tetragonal barium titanate particles and process for producing the same

Spherical tetragonal barium titanate particles of the present invention have a perovskite crystal structure, an average particle diameter of 0.05 to 0.5 &mgr;m, a particle size distribution &sgr;g of not less than 0.70, and a ratio of Ba to Ti of 0.99:1 to 1.01:1. The spherical tetragonal barium titanate particles exhibit an excellent dispersibility as well as a high denseness, a high purity and excellent permittivity properties.

Spherical tetragonal barium titanate particles and process for producing the same

Growing community of inventors

Ube, Japan

Yuji Mishima