Li7P3S11电解质的合成、传导及应用

固态电解质是固态电池中的关键材料，开发具有高离子电导率、高化学/电化学稳定性、电极兼容性良好的固态电解质正成为研究热点。硫化物固态电解质相较其它固态电解质具有更高的离子电导率和良好的机械加工性能等优势，是最有前景实现实用化的固态电解质之一。在众多硫化物固态电解质中，Li₇P₃S₁₁因其高的离子电导率和较低的原料成本而极具研究意义。本文首先介绍了Li₇P₃S₁₁电解质的结构、Li⁺传导机理及合成路径；其次，针对该电解质的电导率提高、空气/水稳定性提升、固固界面稳定性及电解质自身稳定性改善等问题，综述了目前常用的改性策略研究；再次，总结了基于Li₇P₃S₁₁电解质的全固态锂离子电池和全固态锂硫电池的构筑；最后，本文分析了Li₇P₃S₁₁电解质的研究和应用面临的挑战，并指出该电解质未来发展的趋势。

Li7P3S11 Electrolyte: Synthesis, Conduction, and Application

Exploring solid electrolytes with high ion conductivity, good chemical/electrochemical stability, and excellent electrode compatibility is crucial for developing solid-state batteries. Compared with other solid electrolytes, sulfide solid electrolytes possess the advantages of high ionic conductivity and good mechanical processing performance and are expected to be one of the most promising practical solid electrolytes. Among sulfide electrolytes, Li₇P₃S₁₁ is highly attractive due to its high ionic conductivity and lower raw material costs. In this review, the structure, Li⁺ conduction mechanism, and synthetic routes of Li₇P₃S₁₁ electrolyte are described firstly. Then, the current modification strategies utilized to improve the ionic conductivity, air/water stability, and electrochemical stability are recapped, and the applications of Li₇P₃S₁₁ electrolyte both in all-solid-state lithium-sulfur batteries and all-solid-state batteries with commercial cathode materials are systematically summarized. Finally, the challenges and the development trend for Li₇P₃S₁₁ electrolyte and its applications are provided.