Tailoring the LiNbO_(3)coating of Ni-rich cathode materials for stable and high-performance all-solid-state batteries  

作　　者：Seyedhosein Payandeh Florian Strauss Andrey Mazilkin Aleksandr Kondrakov 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]Karlsruhe Nano Micro Facility,Karlsruhe Institute of Technology(KIT),Hermann-von-Helmholtz-Platz 1,76344 Eggenstein-Leopoldshafen,Germany [3]BASF SE,Carl-Bosch-Str.38,67056 Ludwigshafen,Germany

出　　处：《Nano Research Energy》2022年第3期4-10,共7页纳米能源研究（英文）

摘　　要：The research and development of advanced nanocoatings for high-capacity cathode materials is currently a hot topic in the field of solid-state batteries(SSBs).Protective surface coatings prevent direct contact between the cathode material and solid electrolyte,thereby inhibiting detrimental interfacial decomposition reactions.This is particularly important when using lithium thiophosphate superionic solid electrolytes,as these materials exhibit a narrow electrochemical stability window,and therefore,are prone to degradation during battery operation.Herein we show that the cycling performance of LiNbO_(3)-coated Ni-rich LiNi_(x)Co_(y)Mn_(z)O_(2)cathode materials is strongly dependent on the sample history and(coating)synthesis conditions.We demonstrate that post-treatment in a pure oxygen atmosphere at 350℃results in the formation of a surface layer with a unique microstructure,consisting of LiNbO_(3)nanoparticles distributed in a carbonate matrix.If tested at 45℃and C/5 rate in pellet-stack SSB full cells with Li_(4)Ti_(5)O_(12)and Li_(6)PS_(5)Cl as anode material and solid electrolyte,respectively,around 80%of the initial specific discharge capacity is retained after 200 cycles(~160 mAh·g^(−1),~1.7 mAh·cm^(−2)).Our results highlight the importance of tailoring the coating chemistry to the electrode material(s)for practical SSB applications.

关 键 词：solid-state battery layered Ni-rich oxide cathode superionic solid electrolyte protective surface coating side reactions 

分 类 号：TM912[电气工程—电力电子与电力传动]