Optimizing the operation strategy of solid-conversion sulfur cathodes for achieving high total capacity contribution throughout the lifespan

Xue Chen, Ziyun Miao, Xu Zhang, Lixia Yuan, Yunhui Huang, Zhen Li

Research output: Contribution to journalArticlepeer-review

2 Scopus citations

Abstract

Solid-solid sulfur conversion reaction caused by cathode electrolyte interphase (CEI) can effectively prevent the dissolution of lithium polysulfides and theoretically improve the cycle stability of lithium-sulfur (Li–S) batteries. However, once the volume of reduction products (Li2S) exceeds the maximal volume of hosts, the as-formed CEI will be destroyed and significantly shorten the cycle life. In this study, we report a simple capacity control strategy to obtain a stable CEI which can greatly increase the total capacity contribution of Li–S batteries throughout the whole lifespan. By adjusting the discharging condition, Li–S cells achieve a prolonged cycle life over 950 cycles and a remarkable total capacity of 289 Ah g−1 based on sulfur during the whole lifetime. Meanwhile, it is also found that the cycle life depends to a great extent on lithium anodes. This discharging strategy and understanding on the solid phase sulfur conversion under CEI mechanism can advance progress for the development of Li–S batteries.
Original languageEnglish (US)
JournalJournal of Power Sources
Volume543
DOIs
StatePublished - Sep 30 2022
Externally publishedYes

Bibliographical note

Generated from Scopus record by KAUST IRTS on 2023-09-20

ASJC Scopus subject areas

  • Energy Engineering and Power Technology
  • Physical and Theoretical Chemistry
  • Electrical and Electronic Engineering
  • Renewable Energy, Sustainability and the Environment

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