Journal
SCIENCE CHINA-MATERIALS
Volume 65, Issue 3, Pages 629-636Publisher
SCIENCE PRESS
DOI: 10.1007/s40843-021-1773-8
Keywords
FeF2 nanocrystals; artificial PVDF-based CEI layer; cyclic stability; lithium-ion batteries
Categories
Funding
- Science and Technology Commission of Shanghai Municipality [20520710400, 19JC1412600, 18230743400]
- National Natural Science Foundation of China [21771124, 21901156]
- Oceanic Interdisciplinary Program [SL2020MS020]
- Shanghai Jiao Tong University
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By encapsulating FeF2 nanoparticles in polymer gelatin and confining the conversion reaction in a localized nanosized space, the FeF2@100%G-40%P electrodes exhibit improved kinetics, good cyclic stability, and high rate performance.
Iron difluoride (FeF2) is considered a high-capacity cathode material for lithium-ion batteries. However, its specific capacity and stability are limited by the poor electrochemical kinetics of conversion reactions. Herein, the conversion reaction is confined in a localized nanosized space by encapsulating FeF2 nanoparticles in polymer gelatin. The FeF2 nanocrystal-coated polyvinylidene fluoride-based layer (defined as FeF2@100%G-40%P) was synthesized by glucose-assisted in-situ gelatinization to construct an artificial cathode solid electrolyte interphase via a solvothermal process. Thanks to the improved kinetics of the localized conversion reaction, the obtained FeF2@100%G-40%P electrodes show good cyclic stability (313 mA h g(-1) after 150 cycles at 100 mA g(-1), corresponding to a retention of 80%) and a high rate performance (186.6 mA h g(-1) at 500 mA g(-1)).
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