Panasonic Corporation

Sumitomo Metal Mining Company, Ltd.

Isao Abe

Satoshi Matsumoto

Takashi Takeuchi

Shuji Tsutsumi

Norihiro Yamamoto

Shinji Arimoto

Yutaka Kawatate

A lithium nickel composite oxide, having small inner resistance, large battery capacity and high thermal stability, can be used as a positive electrode active material for a non-aqueous electrolyte secondary battery. The positive electrode active material is composed of the lithium nickel composite oxide of LiNiMO(wherein M represents at least one element selected from a transition metal element other than Ni, the second group element and the thirteenth group element; a satisfies 0.01&#x2266;a&#x2266;0.5; and b satisfies 0.9&#x2266;b&#x2266;1.1). This is obtained by filtering and drying the fired powder after water washing, wherein it is dried at 90&#xb0; C. or lower, till moisture is reduced to 1% or less by mass in drying, and then at 120&#xb0; C., and under gas atmosphere where content of compound components containing carbon is 0.01% or less by volume, or under vacuum atmosphere.

Positive electrode active material, method for producing same, and non-aqueous electrolyte secondary battery using same

The present invention provides a positive electrode active material for a non-aqueous electrolyte-based secondary battery, composed of a lithium/nickel composite oxide with high capacity, low cost and excellent heat stability, an industrially suitable production method therefor, and a high safety non-aqueous electrolyte-based secondary battery. A lithium/nickel composite oxide is produced by the following steps (a) to (c):

Positive Electrode active material for non-aqueous electrolyte-based secondary battery, production method therefor and non-aqueous electrolyte-based secondary battery using the same

The present invention provides a positive electrode active material for a non-aqueous electrolyte-based secondary battery, composed of a lithium/nickel composite oxide with high capacity, low cost and excellent heat stability, and a high safety non-aqueous electrolyte-based secondary battery. A positive electrode active material, comprising lithium/nickel composite oxide powders obtained by water washing fired powders having the following composition formula (1), followed by filtering and drying:LiNiMO&#x2003;&#x2003;(1)(wherein, M represents at least one kind of an element selected from transition metal elements other than Ni, group 2 elements, or group 13 elements; and 'a' satisfies 0.01&#x2266;a&#x2266;0.5), characterized in that specific surface area of the lithium/nickel composite oxide powders after water washing is 0.3 to 2.0 m/g.

Lithium/nickel composite oxide positive electrode active material for non-aqueous electrolyte-based secondary battery and battery using the same

Growing community of inventors

Niihama, Japan

Isao Abe