摘要
石榴石型无机固态电解质Li_(7)La_(3)Zr_(2)O_(12)(LLZO)因具有较高的离子电导率、较宽的电位窗口以及良好的化学稳定性,被认为是全固态电池理想的电解质材料之一。然而,LLZO在制备过程中存在高温锂挥发、立方相结构难以稳定以及烧结致密度低等问题,离子电导率提升空间受限,阻碍了其商业应用。本文介绍了LLZO的制备技术进展,包括烧结助剂法、微波烧结法和电场辅助烧结法,系统分析了抑制锂挥发与提高致密度的策略;探讨了LLZO在Li位、Zr位以及La位的元素掺杂改性,以及LLZO-聚合物复合改性方面的研究进展,以期为设计开发具有更高离子电导率的LLZO固态电解质提供参考;总结了LLZO烧结制备、掺杂改性和复合改性研究中存在的不足,并对LLZO固态电解质的研究方向进行了展望。
The garnet-type inorganic solid-state electrolyte Li_(7)La_(3)Zr_(2)O_(12)(LLZO)is widely recognized as a leading candidate for all-solid-state batteries due to its high ionic conductivity,wide electrochemical window,and excellent chemical stability.However,during the preparation of LLZO,issues such as lithium volatilization at high temperature,instability of the cubic-phase structure,and low sintering density collectively limit the improvement of ionic conductivity and hinder its commercial application.This paper reviews the advances in LLZO preparation techniques,including additive-assisted sintering,microwave sintering,and electric-field-assisted sintering,and systematically analyzes strategies to suppress lithium volatilization and enhance densification.Furthermore,the progress on elemental doping at Li,Zr,and La sites as well as LLZO-polymer composite modification are discussed,aiming to provide insights for the design of LLZO solid-state electrolytes with superior ionic conductivity.Finally,current limitations in sintering,doping,and composite modification approaches are summarized,and future research directions for LLZO-based solid electrolytes are outlined.
作者
毛亭欣
丁丽香
张海军
雷文
MAO Tingxin;DING Lixiang;ZHANG Haijun;LEI Wen(State Key Laboratory of Advanced Refractories,Wuhan University of Science and Technology,Wuhan 430081,China)
出处
《武汉科技大学学报》
北大核心
2025年第5期356-366,共11页
Journal of Wuhan University of Science and Technology
基金
国家自然科学基金项目(52072274,52272021,52232002).
