Pi R&d Co., Ltd.

Mori Polymer Co., Inc.

Takaki Mori

Toshiyuki Goshima

Maw Soe Win

Disclosed is a highly reliable secondary battery, as well as an electrode and a conductive agent used therefor, which battery has a long cycle life and is also less likely to be damaged or rupture even when the battery temperature becomes abnormally high. The conductive agent of the battery electrode contains, as the main component, a reaction product between a &#x3c0;-conjugated carbon material and a soluble polyimide, preferably a soluble block copolymerized polyimide. The battery electrode is formed by coating a composition containing this conductive agent and an electrode active substance onto a current collector. The battery comprises this electrode.

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Yokohama, Japan

Takaki Mori