Dual-Anion Reinforced Cathode–Electrolyte Interphase for Stable Conversion-Type Cathode
Pyrite FeS<sub>2</sub>, recognized as a promising conversion-type cathode material for high-energy-density batteries, encounters a rapid decline in capacity due to the polysulfide shuttle effect. To tackle these challenges, this study introduces a nonflammable locally concentrated ionic liquid electrolyte (LCILE) composed of lithium bis(fluorosulfonyl)imide (LiFSI), 1-vinylpropyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide (AMImTFSI), and 1,1,2,2-tetrafluoroethyl-2,2,3,3-tetrafluoropropyl ether (TTE). This electrolyte manifests a tailored solvation structure with FSI-TFSI dual-anion-dominated aggregates (AGGs), which effectively mitigates the shuttle effect of polysulfides and fosters the formation of a robust dual-anion-derived cathode-electrolyte interphase (CEI) on the FeS<sub>2</sub> cathode. Consequently, the Li/FeS<sub>2</sub> battery sustains a capacity of 627 mAh g<sup>-1</sup> after 200 cycles with a high retention rate of 90%, which significantly bolsters the cyclic stability of the FeS<sub>2</sub> cathode. This research offers insight into the design of advanced electrolytes for future Li/FeS<sub>2</sub> batteries.
Authors
- Hongyu Liu (ORCID: https://orcid.org/0000-0002-2930-3510)
- Aodi Li (ORCID: https://orcid.org/0009-0001-0634-079X)
- Hong Li (ORCID: https://orcid.org/0000-0002-8659-086X)
- Liping Wang (ORCID: https://orcid.org/0000-0002-6412-266X)
- Xianming Liu (ORCID: https://orcid.org/0000-0001-7426-3450)
- Zhicheng Wang (ORCID: https://orcid.org/0009-0003-1152-8636)
- Xiaodong Wu (ORCID: https://orcid.org/0000-0003-3802-756X)
Institutions
- University of Science and Technology of China (CN)
- University of Electronic Science and Technology of China (CN)
- Chinese Academy of Sciences (CN)
- Suzhou University of Science and Technology (CN)
- Suzhou Institute of Nano-tech and Nano-bionics (CN)
- FZU ‒ Institute of Physics of the Academy of Sciences of the Czech Republic (CZ)
- Tianmu Lake Institute of Advanced Energy Storage Technologies (China) (CN)
- Advanced Energy Materials (United States) (US)
- Key Laboratory of Nuclear Radiation and Nuclear Energy Technology (CN)
Publication Details
- Journal
- ACS Applied Materials & Interfaces
- Published
- 2025-05-27
- DOI
- https://doi.org/10.1021/acsami.5c03670
- Citations
- 2
- Primary Topic
- Advancements in Battery Materials
- Type
- article
- Field-Weighted Citation Impact
- 1.46
Funders
- National Natural Science Foundation of China
- Natural Science Foundation of Sichuan Province
- National Key Research and Development Program of China