文献类型：期刊文献

中文题名：Synergic effect of covalent and chemical sulfur fixation enhancing the immobilization-conversion of polysulfides in lithium-sulfur batteries

作者：Ruili Gao Qian Zhang Hui Wang Fanghui Wang Jianwei Ren Xuyun Wang Xianguo Ma Rongfang Wang

第一作者：Ruili Gao

机构：[1]College of Chemical Engineering,State Key Laboratory Base for Eco-Chemical Engineering,Qingdao University of Science and Technology,Qingdao 266042,Shandong,China;[2]School of Chemistry and Engineering,Weifang Vocational College,Weifang 261108,Shandong,China;[3]Department of Mechanical Engineering Science,University of Johannesburg,Cnr Kingsway and University Roads,Auckland Park 2092,Johannesburg,South Africa;[4]School of Chemical Engineering,Guizhou Institute of Technology,Guiyang 550003,Guizhou,China

第一机构：College of Chemical Engineering,State Key Laboratory Base for Eco-Chemical Engineering,Qingdao University of Science and Technology,Qingdao 266042,Shandong,China

年份：2023

期号：4

起止页码：1-11

中文期刊名：能源化学:英文版

外文期刊名：Journal of Energy Chemistry

收录：CSTPCD;;Scopus;CSCD:【CSCD2023_2024】；

基金：the financially supports from the National Natural Science Foundation of China(51963004);the Natural Science Foundation of Shandong Province of China(ZR2020MB024)。

语种：英文

中文关键词：Lithium-sulfur battery;Covalent sulfur-fixation;Chemical sulfur-fixation;Electrolyte additive;Cycling stability

摘要：Lithium-sulfur batteries(LSBs)are promising as the next generation energy storage options.However,their wide applications have been technically challenged by the diffusion losses of polysulfides and polysulfide shuttle effect.In this work,the small organic molecules of 2,5-dichloropyrazine(2,5-DCP)were combined with Co-doped carbon(CoA NAC)flakes to achieve the synergic effect of the covalent and chemical sulfur fixation,so as that the immobilization-conversion of polysulfides in LSBs was greatly enhanced.More specifically,the nucleophilic substitution of the 2,5-DCP additive in the electrolyte with polysulfides formed the CAS bonds.Through the further covalent N-Li bonds between the N atoms in 2,5-DCP and polysulfides,sulfur fixation was achieved in the form of solid organosulfur.Meanwhile,the CoA NAC flakes served as the sulfur cathode to chemically anchor the polysulfides.The interaction mechanism between CoA NAC/2,5-DCP and polysulfides was explored by the density functional theory(DFT)calculations and in-situ infrared spectroscopy.The results showed that the optimal“with 2,5-DCP”sample-assembled LSB exhibited an initial discharge specific capacity of 1244 mA h g^(-1)at 0.2C,and a capacity decay rate of 0.053%per cycle was displayed after 800 cycles at 1C.The good cycling stability with a high sulfur-loaded electrode sample suggested that the synergic effect of covalent/chemical sulfur fixation enabled the enhancement of polysulfides immobilization-conversion in LSBs.