An Organodiselenide Comediator to Facilitate Sulfur Redox Kinetics in Lithium–Sulfur Batteries with Encapsulating Lithium Polysulfide Electrolyte

Research output: Contribution to journalResearch articleContributedpeer-review

Contributors

  • Yiran Liu - , Beijing Institute of Technology (Author)
  • Meng Zhao - , Beijing Institute of Technology, Dresden University of Technology (Author)
  • Li Peng Hou - , Tsinghua University (Author)
  • Zheng Li - , Tsinghua University (Author)
  • Chen Xi Bi - , Beijing Institute of Technology (Author)
  • Zi Xian Chen - , Beijing Institute of Technology (Author)
  • Qian Cheng - , Beijing Institute of Technology (Author)
  • Xue Qiang Zhang - , Beijing Institute of Technology (Author)
  • Bo Quan Li - , Beijing Institute of Technology (Author)
  • Stefan Kaskel - , Chair of Inorganic Chemistry I (Author)
  • Jia Qi Huang - , Beijing Institute of Technology (Author)

Abstract

Lithium–sulfur (Li–S) batteries are regarded as promising high-energy-density energy storage devices. However, the cycling stability of Li–S batteries is restricted by the parasitic reactions between Li metal anodes and soluble lithium polysulfides (LiPSs). Encapsulating LiPS electrolyte (EPSE) can efficiently suppress the parasitic reactions but inevitably sacrifices the cathode sulfur redox kinetics. To address the above dilemma, a redox comediation strategy for EPSE is proposed to realize high-energy-density and long-cycling Li–S batteries. Concretely, dimethyl diselenide (DMDSe) is employed as an efficient redox comediator to facilitate the sulfur redox kinetics in Li–S batteries with EPSE. DMDSe enhances the liquid–liquid and liquid–solid conversion kinetics of LiPS in EPSE while maintains the ability to alleviate the anode parasitic reactions from LiPSs. Consequently, a Li–S pouch cell with a high energy density of 359 Wh kg−1 at cell level and stable 37 cycles is realized. This work provides an effective redox comediation strategy for EPSE to simultaneously achieve high energy density and long cycling stability in Li–S batteries and inspires rational integration of multi-strategies for practical working batteries.

Details

Original languageEnglish
Article numbere202303363
JournalAngewandte Chemie - International Edition
Volume62
Issue number30
Publication statusPublished - 24 Jul 2023
Peer-reviewedYes

External IDs

WOS 001008961000001

Keywords

ASJC Scopus subject areas

Keywords

  • Electrolyte, Lithium Polysulfides, Lithium–Sulfur Batteries, Pouch Cells, Redox Comediator, Lithium-Sulfur Batteries

Library keywords