Sumitomo Chemical Company, Limited

Asahi Glass Company, Limited

Widjaja Hardiyanto

Naoki Yoshida

Hiroshi Shimoda

Shinji Terazono

Chikaya Tamitsuji

Kohta Yamada

Sadatatsu Ikeda

To provide a cathode active material with which a lithium ion secondary battery having favorable cycle characteristics and having a high energy density even when discharged at a high voltage can be obtained; a cathode comprising the cathode active material; and a lithium ion secondary battery having the cathode. A cathode active material comprising a composite oxide (A) containing Li and at least one transition metal element selected from the group consisting of Ni, Co and Mn, and the following particles (B) and the following fluorinated carbon material (C) present on the surface of the composite oxide (A):

Cathode active material, process for its production, cathode and lithium ion secondary battery

A membrane/electrode assemblyfor a polymer electrolyte fuel cell, which comprises an anodehaving an anode catalyst layercontaining an anode catalyst and an ion-exchange resin, a cathodehaving a cathode catalyst layercontaining a cathode catalyst and an ion-exchange resin, and a polymer electrolyte membranedisposed between the anodeand the cathode, wherein the anode catalyst is one having platinum or a platinum alloy supported on a carbon, and the amount of platinum or a platinum alloy supported in the anode catalyst is from 1 to 25 mass %; and the anode catalyst layercontains fine particles made of at least one member selected from iridium oxide, iridium, ruthenium oxide and ruthenium, and the fine particles have a specific surface area of from 2 to 50 m/g.

Membrane/electrode assembly for polymer electrolyte fuel cell and process for producing membrane/electrode assembly for polymer electrolyte fuel cell

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Chiyoda-ku, Japan

Widjaja Hardiyanto