Showa Denko K.k.

Mahito Murakami

Kunio Nishimura

Koro Shirane

Akinori Sudo

A battery electrode material composed of a composite material including fiber agglomerates having micro-pores and an electrode active material included within the micro-pores of the fiber agglomerates. The agglomerates are formed by tangled masses of vapor-grown carbon fibers having fiber contact points. Furthermore, at least a portion of the fiber contact points are chemically bonded fiber contact points. Also disclosed is a secondary battery including electrodes made from the battery electrode material.

Carbon fiber material and electrode materials for batteries

A carbon fiber material is substantially constituted by fiber agglomerates, having agglomerate sizes in a range of not less than 5 .mu.m and not more than 500 .mu.m, formed by vapor grown carbon fibers having a diameter of not less than 0.05 .mu.m and not more than 5 .mu.m, having a microstructure such that some fiber contact points are bonded together with substances produced by carbonizing carbonaceous matters. This carbon fiber material is used as a filler material to various matrices, and used also as an electrode material for making electrodes in batteries, especially in electric double-layer capacitors, and in secondary batteries, especially those based on lithium or lead.

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Kawasaki, Japan

Mahito Murakami