Nihonkagakusangyo Co., Ltd.

University of Yamanashi

Hajime Kashima

Makoto Uchida

Katsuyoshi Kakinuma

Akihiro Iiyama

Chisato Arata

Kazuhiro Hamada

Yoshito Sugibuchi

A support powder can improve cell performance under high humidity environment. A support and metal catalyst, including: a support powder; and metal fine particles supported on the support powder; wherein: the support powder is an aggregate of support fine particles; the support fine particles are fine particles of oxide compound and has a chained portion structured by a plurality of crystallites being fusion bonded to form a chain; the crystallites have a size of 10 to 30 nm; the support powder has a void; the void includes a secondary pore having a pore diameter of more than 25 nm and 80 nm or less determined by BJH method; and a volume of the secondary pore per unit volume of the support fine particles structuring the support powder is 0.313 cm/cmor more, is provided.

Supported metal catalyst and method for producing same

In a treatment process for a positive electrode active material for a lithium-ion secondary battery, Li compounds such as LiCO, LiOH, and the like, present in a positive electrode active material for a lithium-ion secondary battery but unsuitable for a positive electrode material, is removed. In a case wherein the resultant Li compound is used as a positive electrode material of the secondary battery, a discharge capacity and an average discharge voltage of the secondary battery do not decline, and gelation caused by a cleaning treatment is prevented. The positive electrode active material is cleaned with a cleaning fluid containing NH, and then solid-liquid separation is performed, and a solid component is calcined at 600 to 700&#xb0; C. in an oxygen atmosphere. The cleaning fluid has a conductivity of 11.6 mS/cm or less, and contains a recovered liquid component and may be repeatedly used as a cleaning fluid.

Treatment process for a positive electrode active material for lithium-ion secondary battery

Growing community of inventors

Tokyo, Japan

Hajime Kashima