Issue 46, 2016, Issue in Progress

Influence of a surface modified Li anode on the electrochemical performance of Li–S batteries

Abstract

A bifunctional protective film is successfully prepared on Li metal surface by hexamethylditin modification in order to migrate the corrosion of sulfur-containing species and other electrolyte components. XRD, XPS, CV, SEM, AC impedance, polarization measurements and galvanostatic charge/discharge cycling tests are applied to characterize the film. The experimental results show that the protective film is dense and homogenous with a thickness of ∼10 nm. And under the protection of the film, the modified Li anode exhibits higher stability, lower interface resistance and a lower polarization potential difference than those of the as-received Li anode. Moreover, the cycling performance and rate capability of a Li/S cell are greatly improved by surface modification of the Li anode, delivering a discharge capacity of ∼800 mA h g−1 and a coulombic efficiency of more than 98.5% over 150 cycles at 0.2C as well as a notable rate performance with 510 mA h g−1 at 5C. After cycling, fewer sulfur-containing species are found on the modified Li anode surface than on the as-received Li anode surface, indicating the effective protection of the Li anode.

Graphical abstract: Influence of a surface modified Li anode on the electrochemical performance of Li–S batteries

Article information

Article type
Paper
Submitted
29 Feb 2016
Accepted
12 Apr 2016
First published
13 Apr 2016

RSC Adv., 2016,6, 40270-40276

Influence of a surface modified Li anode on the electrochemical performance of Li–S batteries

M. Wu, J. Jin and Z. Wen, RSC Adv., 2016, 6, 40270 DOI: 10.1039/C6RA05316E

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