In-situ surface coating via poly (vinylidene fluoride) crosslinking toward high performance FeS2 cathode

Jian Zou; Xiaobin Niu; Liping Wang

doi:10.1117/12.2674017

9 March 2023 In-situ surface coating via poly (vinylidene fluoride) crosslinking toward high performance FeS₂ cathode

Jian Zou, Xiaobin Niu, Liping Wang

Proceedings Volume 12600, International Conference on Optoelectronic Materials and Devices (ICOMD 2022); 1260006 (2023) https://doi.org/10.1117/12.2674017
Event: 2022 International Conference on Optoelectronic Materials and Devices, 2022, Chongqing, China

Abstract

FeS₂ is considered to be a promising conversion type cathode because of its high energy density (1671 Wh kg^-1) and low cost (300 $ ton^-1). However, the performance degradation induced by severe polysulfide dissolution and huge volume variation during the cycling hindered its further application. In this paper, we provide a new coating strategy, which involves Li₂S₄ trigging PVDF crosslinking (P-PVDF), to handle these drawbacks. The strengthened P-PVDF not only serves as a cage preventing the leakage of polysulfide but also acts as an elastic shell holding the big volume variation. When adding 10% Li₂S₄, using 3M LiTFSI-DOL/DME as the electrolyte, FeS₂ cathode (6:3:1) realizes the best cycling performance. After 80 cycles, the capacity still remains 641 mAh g^-1.

Citation Download Citation

Jian Zou, Xiaobin Niu, and Liping Wang "In-situ surface coating via poly (vinylidene fluoride) crosslinking toward high performance FeS₂ cathode", Proc. SPIE 12600, International Conference on Optoelectronic Materials and Devices (ICOMD 2022), 1260006 (9 March 2023); https://doi.org/10.1117/12.2674017

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