Battery with special anode material
DRIVE
October 20, 2004
Provided is a battery capable of obtaining superior cycle characteristics. The battery comprises a cylindrical type spirally wound body including a spirally wound laminate of a cathode and an anode with a separator in which an electrolyte solution is impregnated. The anode includes an anode current collector, an outer anode active material layer disposed on an outer winding surface of the anode current collector and an inner anode active material layer disposed on an inner winding surface of the anode current collector. The outer anode active material layer and the inner anode active material layer include Si, Sn or a compound thereof. As a capacity ratio between the outer anode active material layer and the inner anode active material layer in at least a region, assuming that the capacity of the outer anode active material layer is 1, the capacity of the inner anode active material layer facing the outer anode active material layer with the anode current collector in between is within a range of 0.6 to 0.8 inclusive.
Discussion in the ATmosphere