Unveiling solid-solid contact states in all-solid-state lithium batteries:An electrochemical impedance spectroscopy viewpoint  

作　　者：Jin-Liang Li Liang Shen Zi-Ning Cheng Jun-Dong Zhang Ling-Xuan Li Yu-Tong Zhang Yan-Bin Gao Chunli Guo Xiang Chen Chen-Zi Zhao Rui Zhang Qiang Zhang 

机构地区：[1]Tsinghua Center for Green Chemical Engineering Electrification,Beijing Key Laboratory of Green Chemical Reaction Engineering and Technology,Department of Chemical Engineering,Tsinghua University,Beijing 100084,China [2]Advanced Research Institute of Multidisciplinary Science,School of Materials Science and Engineering,Beijing Institute of Technology,Beijing 100081,China [3]Beijing Huairou Laboratory,Beijing 101400,China [4]College of Materials Science and Engineering,Taiyuan University of Technology,Taiyuan 030024,Shanx,China [5]Institute for Carbon Neutrality,Tsinghua University,Beijing 100084,China [6]Shanxi Research Institute for Clean Energy,Tsinghua University,Taiyuan 030032,Shanxi,China

出　　处：《Journal of Energy Chemistry》2025年第2期16-22,I0002,共8页能源化学(英文版)

基　　金：supported by the Beijing Natural Science Foundation(Z200011,L233004);the National Key Research and Development Program(2021YFB2500300);the National Natural Science Foundation of China(52394170,52394171,22109011,22393900,and 22108151);the Tsinghua-Jiangyin Innovation Special Fund(TJISF)(2022JYTH0101);the S&T Program of Hebei(22344402D);the Tsinghua University Initiative Scientific Research Program.

摘　　要：All-solid-state lithium batteries(ASSLBs)are strongly considered as the next-generation energy storage devices for their high energy density and intrinsic safety.The solid-solid contact between lithium metal and solid electrolyte plays a vital role in the performance of working ASSLBs,which is challenging to investigate quantitatively by experimental approach.This work proposed a quantitative model based on the finite element method for electrochemical impedance spectroscopy simulation of different solid-solid contact states in ASSLBs.With the assistance of an equivalent circuit model and distribution of relaxation times,it is discovered that as the number of voids and the sharpness of cracks increase,the contact resistance Rcgrows and ultimately dominates the battery impedance.Through accurate fitting,inverse proportional relations between contact resistance Rcand(1-porosity)as well as crack angle was disclosed.This contribution affords a fresh insight into clarifying solid-solid contact states in ASSLBs.

关 键 词：Electrochemical impedance spectroscopy All-solid-state lithium batteries Solid-solid contacts Finite element method Equivalent circuit model Distribution of relaxation times 

分 类 号：TM9[电气工程—电力电子与电力传动]