Matsushita Electric Industrial Co., Ltd.

Tomoko Kawano

Shoichiro Watanabe

Akira Hashimoto

Shigeo Kobayashi

Takafumi Fujiwara

Yasuhiko Shoji

Yasuhiko Syoji

Method of producing positive active material for non-aqueous electrolyte secondary batteries

Lithium composite metal oxides prepared by mixing at least one type of hydroxides, oxides, and carbonates of a metal selected from the group of transition metal, IIA metal, and IIIA metal, and a lithium compound of which the D50 value is in the range 5 to 50 &mgr;m, the D90 value is 90 &mgr;m or smaller, and in which particles 100 &mgr;m or greater do not exist, and calcining in the temperature range 700 to 1000&deg; C. for 2 to 30 hours, and grinding, are used as the active material of a positive electrode which is laminated with a negative electrode with a separator interposed and spirally wound thereby forming an electrode group. By using the positive active materials prepared in this manner, discharge capacity and cycle characteristic of a non-aqueous electrolyte secondary cell can be improved.

Process for the preparation of a lithium composite metal oxide

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Moriguchi, Japan

Tomoko Kawano