The interplay between (electro)chemical and (chemo)mechanical effects in the cycling performance of thiophosphate-based solid-state batteries  

作　　者：Jun Hao Teo Florian Strauss Felix Walther Yuan Ma Seyedhosein Payandeh Torsten Scherer Matteo Bianchini Jürgen Janek Torsten Brezesinski 

机构地区：[1]Battery and Electrochemistry Laboratory,Institute of Nanotechnology,Karlsruhe Institute of Technology(KIT),Hermann-von-Helmholtz-Platz 1,76344 Eggenstein-Leopoldshafen,Germany [2]Institute of Physical Chemistry&Center for Materials Research,Justus-Liebig-University Giessen,Heinrich-Buff-Ring 17,35392 Giessen,Germany [3]KNMF Laboratory for Micro-and Nanostructuring,Institute of Nanotechnology,Karlsruhe Institute of Technology(KIT),Hermann-von-Helmholtz-Platz 1,76344 Eggenstein-Leopoldshafen,Germany [4]BASF SE,Carl-Bosch-Str.38,67056 Ludwigshafen,Germany

出　　处：《Materials Futures》2022年第1期122-134,共13页材料展望（英文）

基　　金：This study was supported by BASF SE.F Strauss acknowledges financial support from the Fonds der Chemischen Industrie through a Liebig fellowship.

摘　　要：Solid-state batteries(SSBs)are a promising next step in electrochemical energy storage but are plagued by a number of problems.In this study,we demonstrate the recurring issue of mechanical degradation because of volume changes in layered Ni-rich oxide cathode materials in thiophosphate-based SSBs.Specifically,we explore superionic solid electrolytes(SEs)of different crystallinity,namely glassy 1.5Li_(2)S-0.5P_(2)S_(5)-LiI and argyrodite Li_(6)PS_(5)Cl,with emphasis on how they affect the cyclability of slurry-cast cathodes with NCM622(60%Ni)or NCM851005(85%Ni).The application of a combination of ex situ and in situ analytical techniques helped to reveal the benefits of using a SE with a low Young’s modulus.Through a synergistic interplay of(electro)chemical and(chemo)mechanical effects,the glassy SE employed in this work was able to achieve robust and stable interfaces,enabling intimate contact with the cathode material while at the same time mitigating volume changes.Our results emphasize the importance of considering chemical,electrochemical,and mechanical properties to realize long-term cycling performance in high-loading SSBs.

关 键 词：solid-state battery slurry casting lithium thiophosphate electrolyte Ni-rich NCM cathode degradation 

分 类 号：TM912[电气工程—电力电子与电力传动]