To prevent possible deterioration in cycle characteristics due to expansion and shrinkage of negative electrode material, accompanying storage and release of lithium and subsequent advancement in micronization owing to strain caused by stress, and lowering of adhesion to conductive materials, and to provide a lithium secondary battery having enhanced cycle characteristics.
Carbon material such as activated carbon 10 has a plurality of pores 1, 2, 3, and silicon particles 4 are adhered to the surface and the inside of the pores of the activated carbon 10 on hydrolysis. Even when the silicon compound expands and shrinks according to the storage and release of lithium ions, silicon compound 4 is adhered to the surface and the inside of the pores of the activated carbon 10, so that the cycle characteristics, in which service capacity characteristics are maintained at a constant lead, can be enhanced.
KASAI MASAHIRO
HONBOU HIDETOSHI
