US Patent 7318983 Battery

The invention provides a battery achieving excellent battery characteristics by using, as an anode active material, any of metal elements and metalloid elements each of which can form an alloy with a lithium, alloys of these elements, and compounds of these elements. Mesh projections as a frame structure are formed on the surface on the side facing an anode active material layer, of an anode collector. By the mesh projections, expansion and contraction in the plane direction of the anode active material layer is suppressed. Thus, pulverization, peeling, and the like of the anode active material layer caused by expansion and contraction thereof are prevented and the cycle characteristics are improved.