P4S10 modified lithium anode for enhanced performance of lithium-sulfur batteries

To address the corrosion and dendrite issues of lithium metal anodes, a protective layer was ex-situ constructed by P4S10 modification. It was determined by X-ray photoelectron spectroscopy and Raman spectra that the main constituents of the protective layer were P4S10, Li3PS4 and other LixPySz type derivatives. The protective layer was proved to be effective to stabilize the interphase of lithium metal. With the modified Li anodes, symmetric cells could deliver stable Li plating/stripping for 16000 h; Li-S batteries exhibited a specific capacity of 520 mA h g(-1) after 200 cycles at 1000 mA g(-1) with average Coulombic efficiency of 97.9%. Therefore, introducing LixPySz based layer to protect Li anode provides a new strategy for the improvement of Li metal batteries. (C) 2019 Science Press and Dalian Institute of Chemical Physics, Chinese Academy of Sciences. Published by Elsevier B.V. and Science Press. All rights reserved.