Multilayered Sn-Zn/Zn/Cu Alloy Film Electrode Prepared by Electroplating Method for Lithium Secondary Batteries

Abstract

A multilayered Sn-Zn/Zn/Cu film electrode was prepared by an electroplating method and the electrode performance was investigated. The heat-treated electrode showed an excellent charge-discharge performance; a discharge capacity of around 300 mAh g−1 was maintained even after 100 cycles. The electrode was mainly composed of a Cu6Sn5 phase due to interdiffusion of Sn and Cu during heat-treatment process. At the same time, two Zn enriched layers were formed. This optimized electrode structure would relax volume expansion and phase transition during cycling, resulting in an enhanced electrode performance.