硫化物固态电解质颗粒制备技术的研究进展  

Research progress on preparation of sulfide solid electrolyte particles

作　　者：连芳[1] 樊遵浩 李静宜 王梓鑫 LIAN Fang;FAN Zunhao;LI Jingyi;WANG Zixin(School of Materials Science and Engineering,University of Science and Technology Beijing,Beijing 100083,China)

机构地区：[1]北京科技大学材料科学与工程学院,北京100083

出　　处：《中国粉体技术》2025年第2期49-58,共10页China Powder Science and Technology

基　　金：国家自然科学基金项目,编号:52172180,51872026。

摘　　要：【目的】综述硫化物基固态电解质颗粒制备技术进展,探讨更高能量密度和更长循环寿命的硫化物基固态电池的设计和发展。【研究现状】从材料层面上综述硫化物电解质面临的一系列挑战,包括化学稳定性差、电极界面副反应严重、机械失活、缺乏规模化生产技术等问题;概括硫化物颗粒粒径控制、颗粒表面包覆及修饰的研究进展,介绍机械研磨、液相法合成等硫化物电解质的粒径控制方法,以及通过涂层、包覆和改性处理在硫化物颗粒表面形成薄保护层的技术。【结论与展望】提出颗粒粒径小的硫化物电解质的电化学-机械应变能较低,对抑制硫化物电解质的机械降解和失活具有重要作用;液相法可同步完成固态电解质的改性,有望应用于硫化物电解质粉体的低成本大规模制备;认为通过包覆和表面修饰的方法,可精准调控硫化物颗粒的表面状态和化学活性,显著抑制颗粒在潮湿和氧化条件下的反应。Significance Sulfide solid electrolytes(SSEs)have become one of the most promising materials for the industrialization of solid-state batteries,owing to their high ionic conductivity at room temperature and unique mechanical properties.However,in terms of material types,the development of SSEs still faces a series of challenges,including poor chemical stability,severe electrode interface side reactions,mechanical contact loss,and the absence of large-scale production technologies.Over the past decade,many approaches have been proposed to address the above issues.This review focuses on particle size reduction and particle coating/modification to improve the chemical stability and electrochemical performance of SSEs.Progress Small-sized sulfide particles have lower electrochemical/mechanical strain energy,which suppresses mechanical deac-tivation/degradation.Due to the unique mechanical processing and low-temperature crystallization characteristics of sulfides,mechanical ball milling and mechanochemical solid solution synthesis methods are currently effective for obtaining small-sized sulfides.However,the crystallinity of sulfides is changed during the mechanical ball milling process,and the Li+ionic conduc-tivity decreases.In contrast,the liquid-phase synthesis method has the advantages of lower synthesis temperature,shortened synthesis procedure,production of fine sulfide particles,and simultaneous modification,which is expected to be employed for low-cost large-scale preparation of sulfide electrolyte powders.However,sulfides are unstable in air and solvents,limiting the solvents available for liquid-phase sulfide synthesis.The residual solvents and generated impurities are detrimental to the perfor-mance of sulfide electrolytes.Therefore,exploring more feasible processes for large-scale production of sulfide powders will be crucial for the industrialization of sulfide-based solid-state batteries in the future.The surface state and chemical sensitivity of sulfide particles can be precisely controlled by coating

关 键 词：硫化物 固态电解质 固态电池 

分 类 号：TQ174.1[化学工程—陶瓷工业] TM912[化学工程—硅酸盐工业] TB44[电气工程—电力电子与电力传动]