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Dual-salt strategy tuning the solvation structure to achieve high cycling stability for FeS2 cathodes.
- Source :
-
Journal of Colloid & Interface Science . Jun2024, Vol. 663, p203-211. 9p. - Publication Year :
- 2024
-
Abstract
- [Display omitted] Pyrite FeS 2 , as a promising conversion-type cathode material, faces rapid capacity degradation due to challenges such as polysulfide shuttle and massive volume changes. Herein, a localized high-concentration electrolyte (LHCE) based on dual-salt lithium bis(fluorosulfonyl)imide (LiFSI) and lithium bis(trifluoromethanesulphonyl)imide (LiTFSI) is designed to address the challenges. By the dual-salt strategy, we tailor a more desirable solvation structure than that in the single-salt system. Specifically, the solvation structure involving FSI− and TFSI− enables milder electrolyte decomposition, which reduces initial capacity loss. Meanwhile, it facilitates the formation of a stable and flexible cathode/electrolyte interphase (CEI), effectively mitigating side effects and accommodating volume changes. Consequently, the micro-sized FeS 2 realizes a capacity of 641 mAh g−1 after 600 cycles with a retention rate of 90%, significantly improving the cycling stability of the FeS 2 cathode. This work underscores the pivotal role of solvation structure in modulating electrochemical performances and provides a simple and effective electrolyte design concept for conversion-type cathodes. [ABSTRACT FROM AUTHOR]
- Subjects :
- *CATHODES
*SOLVATION
*POLYSULFIDES
*ELECTROLYTES
*PYRITES
*CARBON nanofibers
Subjects
Details
- Language :
- English
- ISSN :
- 00219797
- Volume :
- 663
- Database :
- Academic Search Index
- Journal :
- Journal of Colloid & Interface Science
- Publication Type :
- Academic Journal
- Accession number :
- 176099846
- Full Text :
- https://doi.org/10.1016/j.jcis.2024.02.164