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Artificial cathode solid electrolyte interphase to endow highly stable lithium storage of FeF2 nanocrystals

人工正极固体电解质膜赋予FeF2纳米晶正极材料良好的储锂循环稳定性

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Abstract

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).

摘要

氟化亚铁被认为是锂离子电池的高容量正极材料. 然而, 由于转换反应的电化学动力学不佳, 它们的比容量和稳定性受到很大限制. 如果将转换反应限域在纳米空间中, 可有效避免由于活性物质的长大而导致的失活. 本文中, 我们通过葡萄糖还原和聚偏氟乙烯原位包覆的方法, 在FeF2纳米晶体表面构建了一层聚偏氟乙烯基人工正极固体电解质膜(CEI)(材料定义为FeF2@100%G-40%P). 由于纳米限域空间改善了转化反应的动力学, 抑制了纳米晶长大, 所获得的FeF2@100%G-40%P电 极显示出良好的循环稳定性(在100 mA g−1的电流密度下, 循环150次比容量为313 mA h g−1, 容量保持率为80%)和高倍率性能(在500mA g−1的电流密度下, 比容量为186.6 mA h g−1).

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Acknowledgements

This work was supported by the Science and Technology Commission of Shanghai Municipality (20520710400, 19JC1412600 and 18230743400), the National Natural Science Foundation of China (21771124 and 21901156), the Oceanic Interdisciplinary Program (SL2020MS020), and the SJTU-Warwick Joint Seed Fund (2019/20) of Shanghai Jiao Tong University.

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Authors and Affiliations

  1. Shanghai Electrochemical Energy & Research Centre State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, Shanghai, 200240, China

    Ming Chen  (陈明), Liang Zhao  (赵亮), Xiaomin Li  (李晓敏), Xuejiao Liu  (刘雪娇), Jiantao Zai  (宰建陶), Rongrong Qi  (戚嵘嵘) & Xuefeng Qian  (钱雪峰)

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  1. Ming Chen  (陈明)
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  2. Liang Zhao  (赵亮)
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  3. Xiaomin Li  (李晓敏)
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  4. Xuejiao Liu  (刘雪娇)
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  5. Jiantao Zai  (宰建陶)
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  6. Rongrong Qi  (戚嵘嵘)
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  7. Xuefeng Qian  (钱雪峰)
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Contributions

Author contributions Chen M designed and engineered the materials; Zhao L characterized the battery performances; Zhao L, Li X and Liu X contributed to the data analyses and discussion; Chen M wrote the paper with support from Zai J, Qi R, and Qian X. All authors contributed to the general discussion.

Corresponding authors

Correspondence to Jiantao Zai  (宰建陶), Rongrong Qi  (戚嵘嵘) or Xuefeng Qian  (钱雪峰).

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Conflict of interest

The authors declare that they have no conflict of interest.

Ming Chen received his BE degree in 2014 from Jiujiang University and ME degree in 2018 from Shanghai Normal University. He is a PhD candidate at the School of Chemistry and Chemical Engineering, Shanghai Jiao Tong University. His research interests mainly focus on lithium-ion batteries.

Jiantao Zai received his bachelor (2007) and PhD (2012) degrees in applied chemistry from Shanghai Jiao Tong University, then worked with Prof. Donghai Wang at Penn State University. He joined Shanghai Jiao Tong University as a lecturer in 2014. His research interests include the synthesis chemistry of group IV inorganic materials and their potential applications in energy storage, photovoltaic and photocatalytic areas.

Rongrong Qi received her bachelor degree from Hefei University of Technology, master and PhD degrees from the University of Science and Technology of China. Her research interests include polymers and inorganic nanocomposites.

Xuefeng Qian is a professor and vice dean of the School of Chemistry and Chemical Engineering and a faculty at the State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University. His research interests include structure design, controlled synthesis, modification, and applications of nanomaterials in energy storage and solar energy utilization. He received his bachelor degree in polymer material science (1990) from Hefei University of Technology, master degree (1995) in polymer material science and PhD degree (1998) in inorganic chemistry from the University of Science and Technology of China.

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Chen, M., Zhao, L., Li, X. et al. Artificial cathode solid electrolyte interphase to endow highly stable lithium storage of FeF2 nanocrystals. Sci. China Mater. 65, 629–636 (2022). https://doi.org/10.1007/s40843-021-1773-8

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