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A promising composite solid electrolyte incorporating LLZO into PEO/PVDF matrix for all-solid-state lithium-ion batteries

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Abstract

Solid electrolytes should be sought to exhibit high conductivity, good thermostability, and excellent mechanical properties for realizing excellent performance of lithium-ion batteries. In this study, we optimize the composition of poly(ethylene oxide)/poly(vinylidene fluoride) (PEO/PVDF) matrix and introduce Li6.2Ga0.1La3Zr1.5Bi0.5O12 (LLZO) ceramic powders into the matrix to form novel composite solid electrolytes. The PEO/PVDF blend matrix shows a low melting point and crystallinity and a high thermostability when the weight ratio of PEO and PVDF is 7:3. The electrolyte consisting of this PEO/PVDF blend matrix and 10 wt% LLZO shows the maximum conductivity (4.2 × 10−5 S cm−1 at 30 °C). In addition, all-solid-state LiFePO4||Li battery assembled with this solid electrolyte shows good cycling stability, which retained 96.5% of the maximum capacity after 100 cycles, and columbic efficiency (close to 100%) at 60 °C. The Li||Li symmetric battery assembled with the solid electrolyte can be steadily cycled for more than 300 h at a current density of 0.2 mA cm−2 at 60 °C. Hence, the new as-synthesized solid electrolyte should be a promising electrolyte for high performance of all-solid-state batteries.

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Acknowledgements

This work was supported by the National Nature Science Foundation of China (NSFC no. 51672130, 51572123), the Key Research and Development Program of Jiangsu Province (grant no. BE2018008-2), the Research Fund of State Key Laboratory of Mechanics and Control of Mechanical Structures (Nanjing University of Aeronautics and astronautics) (grant no. MCMS-0518K01), the special fund of 333 high-level talents training project in Jiangsu province (BRA2017424), and A Project Funded by the Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD).

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Authors and Affiliations

  1. State Key Laboratory of Mechanics and Control of Mechanical Structures, Nanjing University of Aeronautics and Astronautics, Nanjing, 210016, China

    Jun Li, Kongjun Zhu, Zhongran Yao, Guoming Qian, Jie Zhang, Kang Yan & Jing Wang

  2. College of Materials Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing, 210016, China

    Jun Li & Jie Zhang

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  1. Jun Li
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  2. Kongjun Zhu
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  3. Zhongran Yao
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  4. Guoming Qian
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  5. Jie Zhang
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  6. Kang Yan
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  7. Jing Wang
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Correspondence to Kongjun Zhu.

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Li, J., Zhu, K., Yao, Z. et al. A promising composite solid electrolyte incorporating LLZO into PEO/PVDF matrix for all-solid-state lithium-ion batteries. Ionics 26, 1101–1108 (2020). https://doi.org/10.1007/s11581-019-03320-x

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  • DOI: https://doi.org/10.1007/s11581-019-03320-x

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