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<p>An ideal solid-state electrolyte needs to combine the properties of high ionic conductivity, wide electrochemical stability window, high electrode–electrolyte chemical compatibility, and low cost. Composite solid-state electrolyte is one of the feasible ways to solve this problem. In this work, a composite solid-state electrolyte Li<sub>2</sub>ZnSiO<sub>4</sub> (LZSO)/ LiAlCl<sub>4</sub> is reported. The low melting-point LiAlCl<sub>4</sub> is introduced to solve the interfacial impedance problem of LZSO solid-state electrolyte due to the hardness of the particles. The structure and electrochemical properties of the two compositions were also characterized, and the effects of different composite ratios on the ionic conductivity of the composite solid-state electrolyte and the low-temperature healing surface structure on the performance enhancement were investigated. The optimal ratio LZSO/LiAlCl<sub>4</sub> (7:3) exhibits good interfacial contactness and an ionic conductivity of 1.65 × 10<sup>−4</sup> S cm<sup>−1</sup> at 60&#xa0;°C as well as a low activation energy of 0.31&#xa0;eV. The assembled lithium symmetric batteries were stably cycled up to 750&#xa0;h. Compared with the single component of LZSO, which cannot satisfy the full-cell assembly, Li/LFP batteries assembled with composite solid-state electrolytes exhibit good cycling performance.</p>

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A halide-oxide composite solid-state electrolyte for enhancing ionic conductivity by promoting interfacial healing through low-temperature heat treatment

  • 期刊论文

  • 发表日期：

    2025年1月6日

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  • Chenyuan Xu,
  • Yu Chao,
  • Sisheng Yang,
  • Borong Li,
  • Yan Yu,
  • Xiaoming Xu,
  • Yulong Sun,
  • Zheyuan Liu,
  • Qian Wang,
  • Chengkai Yang

摘要

An ideal solid-state electrolyte needs to combine the properties of high ionic conductivity, wide electrochemical stability window, high electrode–electrolyte chemical compatibility, and low cost. Composite solid-state electrolyte is one of the feasible ways to solve this problem. In this work, a composite solid-state electrolyte Li2ZnSiO4 (LZSO)/ LiAlCl4 is reported. The low melting-point LiAlCl4 is introduced to solve the interfacial impedance problem of LZSO solid-state electrolyte due to the hardness of the particles. The structure and electrochemical properties of the two compositions were also characterized, and the effects of different composite ratios on the ionic conductivity of the composite solid-state electrolyte and the low-temperature healing surface structure on the performance enhancement were investigated. The optimal ratio LZSO/LiAlCl4 (7:3) exhibits good interfacial contactness and an ionic conductivity of 1.65 × 10−4 S cm−1 at 60 °C as well as a low activation energy of 0.31 eV. The assembled lithium symmetric batteries were stably cycled up to 750 h. Compared with the single component of LZSO, which cannot satisfy the full-cell assembly, Li/LFP batteries assembled with composite solid-state electrolytes exhibit good cycling performance.