石榴石型固体电解质及其界面问题的研究现状  

Recent Progress on Garnet Solid-state Electrolytes and Its Interface Problems

作　　者：冯宏宇 关丽丽 王会涛 宋希文[1] 郭瑞华[1] 王青春[1] FENG Hongyu;GUAN Lili;WANG Huitao;SONG Xiwen;GUO Ruihua;WANG Qingchun(School of Materials and Metallurgy,Inner Mongolia University of Science and Technology,Baotou 014010,Inner Mongolia,China)

机构地区：[1]内蒙古科技大学材料与冶金学院,内蒙古包头014010

出　　处：《材料导报》2023年第S01期9-15,共7页Materials Reports

基　　金：国家自然科学基金(52162010);2022年度自治区直属高校基本科研业务费项目;内蒙古自然科学基金(2020MS05039,2022MS05018)。

摘　　要：全固态锂离子电池相较于液态电池而言,其能量密度更高,安全性更好,符合未来锂离子电池的发展方向,而固体电解质是该类型电池的关键组件。其中,石榴石型电解质锂镧锆氧(Li_(7)La_(3)Zr_(2)O_(12),LLZO)因具有较高的锂离子电导率及与金属锂的良好兼容性,有望成为有机电解液的替代品。本文综述了该类型固体电解质的离子迁移机理,以及不同掺杂位点及掺杂剂类型对结构和电性能的影响,特别介绍了现阶段石榴石型固体电解质的致密化技术及机理,调研了LLZO界面改性方面的进展,对石榴石型固体电解质在锂离子电池中的应用进行展望。Compared to liquid batteries,all-solid-state lithium-ion batteries have higher energy density and better safety,which is in line with the future development direction of Li-ion batteries,and solid-state electrolytes are the key components of this type of batteries.Among them,the garnet-type electrolyte lithium-lanthanum-zirconium-oxygen(Li_(7)La_(3)Zr_(2)O_(12),LLZO)is expected to be an alternative to organic electrolytes due to its high lithium ion conductivity and compatibility with Li metal.This paper reviews the ion migration mechanism of this type solid electrolyte,and the effects of different doping sites and dopant types on the structure and electrical properties.In particular,it introduces the current densification technology and mechanism of garnet-type solid electrolytes,investigates the progress of LLZO interfacial modification,and gives an outlook on the application of garnet-type solid electrolytes in Li-ion batteries.

关 键 词：固体电解质 电性能 掺杂改性 致密化 界面 

分 类 号：TM911[电气工程—电力电子与电力传动]