Patent ID: 8592083

Claim:
A negative active material for a rechargeable lithium battery, comprising: a non-carbon-based active material; and a layer on the non-carbon-based active material, wherein the layer comprises a lithium salt having an oxalatoborate structure and a high-strength polymer binder, wherein a polymer of the high-strength polymer binder is selected from the group consisting of polyamide imides, polyimides, polyacrylonitrile, carboxymethylcellulose, cross-linking copolymers of polyacrylic acid and carboxymethyl cellulose, and combinations thereof, and wherein the non-carbon-based active material is selected from the group consisting of: lithium vanadium oxide, Si, silicon oxides represented SiO x wherein 0<x<2, Si-Y alloys wherein Y is an element selected from the group consisting of alkali metals, alkaline-earth metals, group 13 elements, group 14 elements, transition elements, rare earth elements, and combinations thereof, and wherein Y is not Si, Sn, SnO 2 , Sn-Y alloys wherein Y is an element selected from the group consisting of alkali metals, alkaline-earth metals, group 13 elements, group 14 elements, transition elements, rare earth elements, and combinations thereof, and wherein Y is not Sn, and combinations thereof.