A promising composite solid electrolyte incorporating LLZO into PEO/PVDF matrix for all-solid-state lithium-ion batteries
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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.
KeywordsComposite solid electrolyte Poly(ethylene oxide) Poly(vinylidene fluoride) LLZO All-solid-state lithium-ion battery
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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