Patent ID: 9614214
Date: 2017-04-04
CPC Classifications: H01M,Y02E

Claim:
1. A method for improving charge/discharge cycle characteristics of a lithium secondary battery using a Si based anode active material, the method comprising: surface-treating an anode current collector composed of Cu with a chemical etching mixture of FeCl depositing a metallic zirconium thin film on the surface-treated anode current collector to form an adhesive layer, wherein the adhesive layer is a separate and distinct layer located between the anode current collector and the Si based anode active material; vapor-depositing a silicon film on the adhesive layer while applying a bias voltage to the anode current collector to form an anode; and heat-treating the anode, wherein the heat-treating increases a bond between the adhesive layer and the surface-treated anode current collector, wherein the bias voltage is a DC bias voltage of between about −25V and −200V, and wherein a thickness of the metallic zirconium thin film is in a range of 50 to 500 Å.