A poly(Ethylene oxide)/lithium bis(trifluoromethanesulfonyl)imide-coated polypropylene membrane for a high-loading lithium–sulfur battery

Li Ling Chiu, Sheng Heng Chung

研究成果: Article同行評審

摘要

In lithium–sulfur cells, the dissolution and relocation of the liquid-state active material (polysulfides) lead to fast capacity fading and low Coulombic efficiency, resulting in poor long-term electrochemical stability. To solve this problem, we synthesize a composite using a gel polymer electrolyte and a separator as a functional membrane, coated with a layer of poly(ethylene oxide) (PEO) and lithium bis(trifluoromethanesulfonyl)imide (LiTFSI). The PEO/LiTFSI-coated polypro-pylene membrane slows the diffusion of polysulfides and stabilizes the liquid-state active material within the cathode region of the cell, while allowing smooth lithium-ion transfer. The lithium-sulfur cells with the developed membrane demonstrate a high charge-storage capacity of 1212 mA∙h g−1, 981 mA∙h g−1, and 637 mA∙h g−1 at high sulfur loadings of 2 mg cm−2, 4 mg cm−2, and 6 mg cm−2, respectively, and maintains a high reversible capacity of 534 mA∙h g−1 after 200 cycles, proving its ability to block the irreversible diffusion of polysulfides and to maintain the stabilized polysulfides as the catholyte for improved electrochemical utilization and stability. As a comparison, reference and control cells fabricated using a PEO-coated polypropylene membrane and a regular separator, respectively, show a poor capacity of 662 mA∙h g−1 and a short cycle life of 50 cycles.

原文English
文章編號535
頁(從 - 到)1-10
頁數10
期刊Polymers
13
發行號4
DOIs
出版狀態Published - 2021 二月

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Polymers and Plastics

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