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Sandwich structured PVDF-HFP-based composite solid electrolytes for solid-state lithium metal batteries

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Abstract

It is crucial to develop solid electrolyte with good mechanical and electrochemical stability for the application of lithium metal battery. In this work, a sandwich-structured composite solid electrolyte is designed and prepared based on the blend of polyvinylidene fluoride-hexafluoropropylene/polyacrylonitrile (PVDF-HFP/PAN) polymer, Li6.46La3Zr1.46Ta0.54O12 as filler, and a layer of PE film is introduced in the middle to act as a skeleton. The sandwich-structured PVDF-HFP/PAN-10%LLZTO-PE composite solid electrolyte displays a tensile strength of 66.58 MPa, high ionic conductivity of 2.28 × 10-4 S/m at 25 °C, wide electrochemical stable window of 4.8 V, and high lithium ion transfer number of 0.44. The LiFePO4 | PVDF-HFP/PAN-10%LLZTO-PE | Li coin battery shows a high specific capacity of 161.9 mAh/g and retains 150.2 mAh/g after 300 cycles at 1 C. Furthermore, the LiFePO4 | PVDF-HFP/PAN-10%LLZTO-PE | Li pouch battery shows excellent safety and functionality.

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Funding

This work is financially supported by the Science and Technology Commission of Shanghai Municipality (21ZR1424900, 19DZ2271100).

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Authors and Affiliations

  1. Shanghai Key Laboratory of Materials Protection and Advanced Materials in Electric Power, Shanghai University of Electric Power, Shanghai, 200090, China

    Kang Xu, Chao Xu, Yujie Jiang, Jinhai Cai, Jiaxi Ni & Chunyan Lai

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  1. Kang Xu
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  2. Chao Xu
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  3. Yujie Jiang
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  4. Jinhai Cai
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  5. Jiaxi Ni
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  6. Chunyan Lai
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Correspondence to Chunyan Lai.

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Xu, K., Xu, C., Jiang, Y. et al. Sandwich structured PVDF-HFP-based composite solid electrolytes for solid-state lithium metal batteries. Ionics 28, 3243–3253 (2022). https://doi.org/10.1007/s11581-022-04599-z

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  • DOI: https://doi.org/10.1007/s11581-022-04599-z

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