Enhancement of–OH content on mechanical properties of antiperovskite solid electrolytes  

作　　者：Zunqiu Xiao Huaying Wang Ningyuan Cai Yutong Li Kejia Xiang Wei Wei Tao Ye Zhongtai Zhang Shitong Wang Zilong Tang 

机构地区：[1]State Key Lab of New Ceramics and Fine Processing,School of Materials Science and Engineering,Tsinghua University,Beijing 100084,China [2]College of New Energy,Advanced Chemical Engineering and Energy Materials Research Center,China University of Petroleum(East China),Qingdao 266580,China [3]Department of Nuclear Science and Engineering,Massachusetts Institute of Technology,Cambridge,MA 02139,USA

出　　处：《Nano Research》2024年第7期6139-6146,共8页纳米研究（英文版）

基　　金：the National Natural Science Foundation of China(Nos.52172210 and 51772163).

摘　　要：All-solid-state batteries,renowned for their enhanced safety and high energy density,have garnered broad interest.Oxide solid electrolytes are highly anticipated for their balanced performance.However,their high Young’s modulus and inadaptability to volume change during cycling lead to poor contact and eventual battery failure.In this work,Young’s modulus of Li_(1+x)(OH)_(x)Cl samples is lowered to a level comparable to that of sulfide by regulating the–OH content.As the–OH content increases,Young’s modulus of Li_(1+x)(OH)_(x)Cl samples decreases significantly.This may be due to the local aggregation of–OH groups,forming cavities similar to LiOH structure,which reduces the bonding of the structure.On the premise of high Li-ion conductivity and electrochemical stability,the lowered Young’s modulus improves the contact between the solid electrolyte and the electrodes,forming a strong and stable interfacial layer,thereby improving interfacial and cycling stability.The symmetrical lithium metal cell shows excellent cycle performance of 600 h,and the assembled LiFePO_(4)|Li_(2.4)(OH)1.4Cl|Li cell shows significantly enhanced cycling endurance with 80%capacity retention after 150 cycles.This work not only emphasizes the crucial importance of Young’s modulus in improving interface issues but also offers innovative approaches to advance the mechanical properties of solid electrolytes.

关 键 词：mechanical properties -OH content anti-perovskite solid electrolytes Li-ion batteries 

分 类 号：TM912[电气工程—电力电子与电力传动]