Three-dimensional Sn rich Cu6Sn5 negative electrodes for Li ion batteries

Abstract

Three-dimensional Sn rich Cu6Sn5 electrodes were fabricated by the pulse electrodeposition process on a porous nickel foam substrate to improve discharge capacity and cycle ability of the Sn-Cu alloy negative electrodes for Li-ion batteries. It was aimed to investigate the effect of peak current density on the structure and electrochemical performance of the Sn rich Cu6Sn5 electrodes. The morphology and the structures of the Sn-Cu alloy electrodes were characterized by scanning electron microscopy (SEM). X-ray diffraction (XRD) analyses was also performed to investigate the structure of electro-deposited Sn-Cu based electrodes. The electrochemical features of the electrodes were investigated by charge/discharge tests, cyclic voltammetry experiments and the ac impedance technique. Results showed that morphology of the electrodes exhibited a strong effect on the electrochemical performances and the best electrochemical performances were achieved in the alloy electrodes, which has dendritic like structure obtained using high peak current density. (C) 2016 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.