Patent ID: 8119283

Claim:
A negative active material for a rechargeable lithium battery comprising: a core comprising an active material selected from the group consisting of Si, Si oxides, Sn, Sn oxides, composite tin alloys, transition metal oxides, lithium metal nitrides, and lithium vanadium oxides; and a coating layer formed on the core, the coating layer having a reticular structure and comprising a plurality of -M-O-M- units, wherein M is selected from the group consisting of Si, Ti and Al, and M is bonded to a side chain comprising an organic functional group represented by R 1 —CH═CR 2 —(R 3 ) m —(R 4 ) n — wherein R 1 and R 2 are independently selected from the group consisting of H, CH 3 and CH 2 CH 3 , R 3 is CO 2 , R 4 is selected from the group consisting of CH 2 and CH 2 CH 2 O, m is selected from the group consisting of 0 and 1, and n ranges from 1 to 5.