Adsorption of insoluble polysulfides Li2S(x) (x = 1, 2) on Li2S surfaces

Physical Chemistry Chemical Physics : PCCP
Zhixiao LiuPartha P Mukherjee

Abstract

In lithium-sulfur batteries, the growth of insulating discharge product Li2S film affects the cathode microstructure and the related electron as well as lithium ion transport properties. In this study, chemical reactions of insoluble lithium polysulfides Li2Sx (x = 1, 2) on crystal Li2S substrate are investigated by a first-principles approach. First-principles atomistic thermodynamics predicts that the stoichiometric (111) and (110) surfaces are stable around the operating cell voltage. Li2Sx adsorption is an exothermic reaction with the (110) surface being more active to react with the polysulfides than the stoichiometric (111) surface. There is no obvious charge transfer between the adsorbed molecule and the crystal Li2S substrate. Analysis of the charge density difference suggests that the adsorbate interacts with the substrate via a strong covalent bond. The growth mechanism of thermodynamically stable surfaces is investigated in the present study. It is found that direct Li2S deposition is energetically favored over Li2S2 deposition and reduction process.

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Citations

Feb 3, 2016·ACS Applied Materials & Interfaces·Zhixiao LiuPartha P Mukherjee
Aug 4, 2015·ACS Applied Materials & Interfaces·Vladimir TimoshevskiiKarim Zaghib
Jan 24, 2017·ACS Applied Materials & Interfaces·Zhixiao Liu, Partha P Mukherjee
Apr 24, 2018·Physical Chemistry Chemical Physics : PCCP·Zhixiao LiuPartha P Mukherjee
Dec 5, 2017·Physical Chemistry Chemical Physics : PCCP·Sinan LiShuwei Tang
Jun 15, 2019·Chemical Communications : Chem Comm·Qianqian FanYongzhu Fu
Jan 28, 2021·Chemphyschem : a European Journal of Chemical Physics and Physical Chemistry·Tianyuan HuSuojiang Zhang
Jun 9, 2018·Journal of the American Chemical Society·Shuang-Yan LangLi-Jun Wan
Jul 20, 2019·Nano Letters·Kiran MahankaliLeela Mohana Reddy Arava
Sep 23, 2021·Physical Chemistry Chemical Physics : PCCP·Qiaowei LinWei Lv

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