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research-article

The effect of solvent on the capacity retention in a germanium anode for lithium ion batteries

[+] Author and Article Information
Kuber Mishra

Department of Chemical Engineering, University of South Carolina, Columbia, SC 29208
kuber_mishra4@hotmail.com

Wu Xu

Energy and Environment Directorate, Pacific Northwest National Laboratory, Richland, WA 99354
wu.xu@pnnl.gov

Mark H. Engelhard

Environmental Molecular Sciences Laboratory, Pacific Northwest National Laboratory, Richland, WA 99354
mark.engelhard@pnl.gov

RG Cao

Energy and Environment Directorate, Pacific Northwest National Laboratory, Richland, WA 99354
rgcao@ustc.edu.cn

Jie Xiao

Energy and Environment Directorate, Pacific Northwest National Laboratory, Richland, WA 99354
Jie.Xiao@pnnl.gov

Ji-Guang Zhang

Energy and Environment Directorate, Pacific Northwest National Laboratory, Richland, WA 99354
jiguang.zhang@pnnl.gov

Xiao-Dong Zhou

Institute for Materials Research and Innovation, Department of Chemical Engineering, University of Louisiana at Lafayette, Lafayette, LA 70503
zhou@louisiana.edu

1Corresponding author.

ASME doi:10.1115/1.4039860 History: Received August 24, 2017; Revised March 28, 2018

Abstract

A thin and mechanically stable solid electrolyte interphase (SEI) is desirable for a stable cyclic performance in a lithium ion battery. For the electrodes that undergo a large volume expansion such as Si, Ge and Sn, the presence of a robust SEI layer can improve the capacity retention. In this work, the role of solvent choice on the electrochemical performance of Ge electrode is presented by a systematic comparison of the SEI layers in EC-based and FEC-based electrolytes. The results show that the presence of FEC as a co-solvent in a binary or ternary solvent electrolyte results in an excellent capacity retention of ~ 85% after 200 cycles at the current density of 500 mA·g-1; while EC-based electrode suffers a rapid capacity degradation with a capacity retention of just 17% at the end of 200 cycles. Post analysis by an extensive use of x-ray photoelectron spectroscopy was carried out, which showed that the presence of Li2O in FEC-based SEIs was the origin for the improved electrochemical performance.

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