Dual Role of Mo6S8 in Polysulfide Conversion and Shuttle for Mg–S Batteries

Liping Wang*, Piotr Jankowski, Christian Njel, Werner Bauer, Zhenyou Li, Zhen Meng, Bosubabu Dasari, Tejs Vegge, Juan Maria García Lastra, Zhirong Zhao-Karger*, Maximilian Fichtner*

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

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Abstract

Magnesium–Sulfur batteries are one of most appealing options among the post-lithium battery systems due to its potentially high energy density, safe and sustainable electrode materials. The major practical challenges are originated from the soluble magnesium polysulfide intermediates and their shuttling between the electrodes, which cause high overpotentials, low sulfur utilization, and poor Coulombic efficiency. Herein, a functional Mo6S8 modified separator is designed to effectively address these issues. Both the experimental results and density functional theory calculations show that the electrochemically active Mo6S8 layer has a superior adsorption capability of polysulfides and simultaneously acts as a mediator to accelerate the polysulfide conversion kinetics. Remarkably, the magnesium–sulfur cell assembled with the functional separator delivers a high specific energy density (942.9 mA h g−1 in the 1st cycle) and can be cycled at 0.2 C for 200 cycles with a Coulombic efficiency of 96%. This work demonstrates a new design concept toward high-performance metal–sulfur batteries.
Original languageEnglish
Article number2104605
JournalAdvanced Science
Volume9
Issue number7
Number of pages9
ISSN2198-3844
DOIs
Publication statusPublished - 2022

Keywords

  • Catalytic effect
  • Chevrel phase Mo6S8
  • Density functional theory calculations
  • Functional separator
  • Magnesium–sulfur batteries
  • Polysulfide shuttle

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