LITHIUM SECONDARY BATTERY

摘要

PROBLEM TO BE SOLVED: To provide a lithium secondary battery of which charging/discharging efficiency is heightened and a cycle property is improved by increasing a facing area of a cathode activator and an anode activator.

SOLUTION: The lithium secondary battery is provided with sheet-shaped current collectors and activator layers containing silicon carried on the current collector, and the activator layer is composed of a plurality of columnar particles. At least a part of the columnar particles is grown so as to be slanted against normal line direction of the activator layer. Porosity Pc of lower half part of current collector side of the activator layer and porosity Ps of upper half part of surface side thereof fulfills a relation PcCOPYRIGHT: (C)2007,JPO&INPIT