CONDUCTIVE AGENT FOR BATTERY ELECTRODE, ELECTRODE CONTAINING THE SAME, AND BATTERY

摘要

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 π-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.

主权项

1. A method for producing a conductive agent for a battery electrode, said method comprising:
mixing a π-conjugated carbon material and a solution of a soluble polyimide to give a mixture having a mixing ratio of 10 to 200 parts by weight of the soluble polyimide (not including solvent) with respect to 100 parts by weight of the π-conjugated carbon material; and heating said mixture of the π-conjugated carbon material and the solution of the soluble polyimide before mixing the π-conjugated carbon material and the soluble polyimide with an electrode active substance, wherein said heating is carried out at a temperature of not lower than 80° C. and not higher than 180° C. for not less than 2 hours, and wherein the polyimide contains at least one component comprising a unit having a carbonyl group and/or an ether group as an aromatic ring-linking group in the molecular skeleton.