Surface-modified silicon anode active material, method of preparing the same, and anode and lithium battery employing the same

摘要

An anode active material comprising silicon particles with an interfacial layer formed on the surface of the silicon is provided. The interfacial layer has good electron conductivity, elasticity and adhesion among anode materials, thereby enhancing anode capacity and reducing stress caused by expansion of silicon particles during charge and discharge cycles. Direct contact between silicon particles and electrolyte is remarkably reduced as well. In addition, anodes and lithium batteries including the anode active material exhibit excellent capacity and cycle efficiency.