Stabilized Li-S batteries with anti-solvent-tamed quasi-solid-state reaction

Yatao Liu, Linhan Xu, Yongquan Yu, Meng Xue He, Han Zhang, Yanqun Tang, Feng Xiong, Song Gao, Aijun Li, Jianhui Wang, Shenzhen Xu, Doron Aurbach, Ruqiang Zou, Quanquan Pang

Research output: Contribution to journalArticlepeer-review

2 Scopus citations

Abstract

The transition from dissolution-precipitation to quasi-solid-state sulfur reaction promises restricted polysulfide shuttle and lean electrolyte operation of Li-S batteries but incurs poor reaction kinetics. We here demonstrate that structural reorganization of sparingly solvating electrolytes (SSEs)—which is uniquely afforded by using low-density and low-cost aromatic anti-solvents—is vital for taming the quasi-solid-state sulfur reaction. Aromatic anti-solvents disrupt the interconnected structure of concentrated tetrahydrofuran (THF) electrolyte, uniquely creating subdomains that act to dissolve elemental sulfur, thus accelerating its consumption and re-formation while maintaining ultralow polysulfides solubility. The altered subdomains further result in robust solid electrolyte interphase (SEI) on lithium metal. As a result, the Li-S cell with a 3 mgsulfur cm−2 sulfur cathode can cycle steadily for ∼160 cycles with a lean electrolyte of 5 μL mgsulfur−1. Our work provides new insights into fine-tuning the electrolyte microstructure through solvent innovations for developing sulfur-based batteries that are high energy, cheap, and durable.

Original languageEnglish
Pages (from-to)2074-2091
Number of pages18
JournalJoule
Volume7
Issue number9
DOIs
StatePublished - 20 Sep 2023

Bibliographical note

Publisher Copyright:
© 2023 Elsevier Inc.

Keywords

  • Li-S batteries
  • anti-solvent
  • electrolyte design
  • lithium anode
  • quasi-solid-state reactions
  • solvation structure
  • sparingly solvating electrolyte
  • sulfur reaction pathway

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