| abstract |
(57) [Summary] [PROBLEMS] To suppress the expansion of an electrode active material such as graphite powder due to repeated charge and discharge in a secondary battery, and to prevent a decrease in battery capacity due to repeated charge and discharge. SOLUTION: An aggregate formed by entanglement of dendritic vapor-grown carbon fibers is used, this aggregate is mixed with an electrode active material powder, and a part of the active material powder is taken into a fine cavity of the aggregate. The composite in the folded state is used as an electrode material. |