Impact of fabrication methods on binder distribution and charge transport in composite cathodes of all-solid-state batteries  

作　　者：Benjamin Emley Chaoshan Wu Lihong Zhao Qing Ai Yanliang Liang Zhaoyang Chen Liqun Guo Tanguy Terlier Jun Lou Zheng Fan Yan Yao 

机构地区：[1]Materials Science and Engineering Program and Texas Center for Superconductivity at the University of Houston,University of Houston,4726 Calhoun Rd,Houston,TX 77204,United States of America [2]Department of Electrical and Computer Engineering,University of Houston,4726 Calhoun Rd,Houston,TX 77204,United States of America [3]Department of Materials Science and Nano Engineering,Rice University,6100 Main Street,Houston,TX 77005,United States of America [4]SIMS Laboratory,Shared Equipment Authority,Rice University,Houston,TX 77005,United States of America [5]Department of Engineering Technology,University of Houston,Houston,TX 77204,United States of America

出　　处：《Materials Futures》2023年第4期127-135,共9页材料展望（英文）

基　　金：supported by the U.S.Department of Energy’s Office of Energy Efficiency and Renewable Energy(EERE)under the Vehicle Technologies Program under Contact DE-EE0008864.

摘　　要：The manufacturing process of all-solid-state batteries necessitates the use of polymer binders.However,these binders,being ionic insulators by nature,can adversely affect charge transport within composite cathodes,thereby impacting the rate performance of the batteries.In this work,we aim to investigate the impact of fabrication methods,specifically the solvent-free dry process versus the slurry-cast wet process,on binder distribution and charge transport in composite cathodes of solid-state batteries.In the dry process,the binder forms a fibrous network,while the wet process results in binder coverage on the surface of cathode active materials.The difference in microstructure leads to a notable 20-fold increase in ionic conductivity in the dry-processed cathode.Consequently,the cells processed via the dry method exhibit higher capacity retention of 89%and 83%at C/3 and C/2 rates,respectively,in comparison to 68%and 58%for the wet-processed cells at the same rate.These findings provide valuable insights into the influence of fabrication methods on binder distribution and charge transport,contributing to a better understanding of the binder’s role in manufacturing of all-solid-state batteries.

关 键 词：solid-state battery solvent-free dry process polymer binder lithium thiophosphate electrolyte 

分 类 号：TB33[一般工业技术—材料科学与工程] TM912[电气工程—电力电子与电力传动]