New Lithium Salt Forms Interphases Suppressing Both Li Dendrite and Polysulfide Shuttling

Yinglin Xiao, Bing Han, Yi Zeng, Shang-Sen Chi, Xianzhe Zeng, Zijian Zheng, Kang Xu (Corresponding Author), Yonghong Deng (Corresponding Author)

Research output: Journal article publicationJournal articleAcademic researchpeer-review

27 Citations (Scopus)

Abstract

Lithium–sulfur batteries (LSBs) are considered promising candidates for the next-generation energy-storage systems due to their high theoretical capacity and prevalent abundance of sulfur. Their reversible operation, however, encounters challenges from both the anode, where dendritic and dead Li-metal form, and the cathode, where polysulfides dissolve and become parasitic shuttles. Both issues arise from the imperfection of interphases between electrolyte and electrode. Herein, a new lithium salt based on an imide anion with fluorination and unsaturation in its structure is reported, whose interphasial chemistries resolve these issues simultaneously. Lithium 1, 1, 2, 2, 3, 3-hexafluoropropane-1, 3-disulfonimide (LiHFDF) forms highly fluorinated interphases at both anode and cathode surfaces, which effectively suppress formation of Li-dendrites and dissolution/shuttling of polysulfides, and significantly improves the electrochemical reversibility of LSBs. In a broader context, this new Li salt offers a new perspective for diversified beyond Li-ion chemistries that rely on a Li-metal anode and active cathode materials.

Original languageEnglish
Article number1903937
Pages (from-to)1903937-n/a
JournalAdvanced Energy Materials
Volume10
Issue number14
DOIs
Publication statusPublished - 1 Apr 2020

Keywords

  • electrolytes
  • interphases
  • lithium salts
  • lithium–sulfur batteries

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Materials Science(all)

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