期刊
MATERIALS TODAY ENERGY
卷 7, 期 -, 页码 98-104出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.mtener.2018.01.002
关键词
Lithium-sulfur batteries; Polymer membrane; Nanoporosity; Polysulfide shuttle; Electrochemical performance; Molecular dynamics simulation
资金
- U.S. Department of Energy, Office of Basic Energy Sciences, Division of Materials Sciences and Engineering [DE-SC0005397]
- Robert A. Welch Foundation [F-1535, F-1904]
- HPC resources - Texas Advanced Computing Center (TACC)
- China Scholarship Council [201506170095]
Polysulfide-shuttle has been a critical concern for the advancement of lithium-sulfur (Li-S) batteries. Celgard membranes that are generally used in Li-S batteries exhibit a porous structure with a pore dimension generally on the micrometer scale. During cell operation, soluble lithium polysulfide species can easily migrate from the cathode through the porous separator and react with the lithium-metal anode. Such an unexpected chemical reaction induces a cascade of negative effects on the overall performance of Li-S batteries. Use of ion-selective membranes with reduced pore size provides a promising approach to suppress the migration of polysulfide species. In this study, a membrane based on a polymer with intrinsic nanoporosity (PIN) with a pore size of <1.0 nm is explored as a separator in Li-S batteries to mitigate the polysulfide-shuttle problem. The PIN membrane exhibits a unique structure with pore dimensions of less than 1.0 nm, which allows the transport of Li-ions, but effectively blocks the migration of dissolved polysulfides. As a result, the cycling performance of Li-S batteries is significantly improved. In addition to demonstrating a PIN-membrane Li-S battery, the structural characteristics of the PIN membrane have been characterized by a series of experimental methodologies and molecular dynamics (MD) simulations. (C) 2018 Elsevier Ltd. All rights reserved.
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