Carbonaceous electrode material for secondary battery, process for producing the same, and secondary batteries using the same

摘要

The carbonaceous electrode material for a secondary battery includes a core carbonaceous material composed of high-crystallinity graphite, and a surface covering, layer coated to surround the core carbonaceous material. The surface covering layer is formed of a mixture of a shape-controlled metallic material and a pitch which is an amorphous carbonaceous material. A surface of the core carbonaceous material has a low-crystallinity structure. The carbonaceous electrode material for a secondary battery is useful to produce a secondary battery having excellent cycle characteristics and charging/discharging efficiency by minimizing a volume change of the secondary battery upon charging/discharging of the battery thereby to prevent a bond between the core carbonaceous material and the covering layer from being ruptured or isolated.