Enhancing the stability of silicon nanosheets electrodes by fluoroethylene carbonate

Abstract

Stabilization of the SEI layer that is formed by consuming active lithium in electrolytes is a critical issue for improving the cyclability of lithium ion batteries. We used SiNSs as anodes and investigated the effect of fluoroethylene carbonate (FEC) additives on the SEI layer. Our XPS, EIS and TEM analysis of C-O and C=O bonds, interfacial resistance and thickness of SEI layer, respectively, shows that the FEC produces electrochemically and mechanically stable SEI layer. The SiNSs with FEC showed the capacity of over 1500 mA h g(-1) with 95% efficiency after 200 cycles. (C) 2017 Elsevier B.V. All rights reserved.