Hitachi Powdered Metals Co., Ltd.

Hitachi Cable, Inc.

Minoru Shirahige

Kazuhiko Nakagawa

Masahiro Seido

Tatsuya Tonogi

Masahiro Okahara

Shigemi Oyama

Katsutomo Ohzeki

A corrosive resistant metal material covered with a conductive substance suitable for use in a component material requiring conductivity and corrosion resistance like electrical conductive material, electrical contact, electromagnetic wave shield, electrochemical electrode or antistatic material, specifically for component material requiring conductivity in sever condition of corrosive environment is provided. A corrosive resistant metal material covered with a conductive substance is formed by cladding a corrosive resistant metal selected from the group consisting of titanium, zirconium, tantalum, niobium and alloy thereof on a conductive metal selected from the group consisting of iron, aluminum, copper, titanium, magnesium, zirconium, tantalum, niobium, tungsten, nickel, chrome and alloy thereof, and covering a conductive surface finishing layer over surface of a corrosive resistant metal layer with a mixture of conductive substance and resinous binder.

Corrosive resistant metal material covered with conductive substance

A method of producing graphite powder for a negative electrode of a lithium ion secondary cell excellent in discharge/charge efficiency (Coulomb efficiency) and having a high capacity retention rate, wherein 0.01 to 10 wt % (on the basis of the graphite material) of a starch derivative having C H O as a basic structure or other surface active materials are allowed to be adsorbed by or to coat the surface of a graphite material for a negative electrode capable of occluding and releasing lithium ions and furthermore at least one kind of metal elements selected from the group consisting of lithium, calcium, magnesium, sodium and potassium is added.

Graphite powder for negative electrode of lithium ion secondary cell and method of production thereof

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Chiba, Japan

Minoru Shirahige