Alleviating the sluggish kinetics of all-solid-state batteries via cathode single-crystallization and multi-functional interface modification  

作　　者：Wen-Zhe Liu Xin-Hai Meng Zi-Yi Zhou Qiang Zheng Ji-Lei Shi Yue Gong Yu-Guo Guo 

机构地区：[1]CAS Key Laboratory of Molecular Nanostructure and Nanotechnology,Beijing National Laboratory for Molecular Sciences(BNLMS),Institute of Chemistry,Chinese Academy of Sciences,Beijing 100190,China [2]University of Chinese Academy of Sciences,Beijing 100049,China [3]CAS Key Laboratory of Standardization and Measurement for Nanotechnology,National Center for Nanoscience and Technology,Beijing 100190,China

出　　处：《Journal of Energy Chemistry》2024年第11期123-133,共11页能源化学（英文版）

基　　金：National Key R&D Program of China (2023YFB2503900);National Natural Science Foundation of China (22222904, 22179133 and 12374176);CAS Project for Young Scientists in Basic Research (YSBR-058)。

摘　　要：The application of Li-rich Mn-based cathodes, the most promising candidates for high-energy-density Liion batteries, in all-solid-state batteries can further enhance the safety and stability of battery systems.However, the utilization of high-capacity Li-rich cathodes has been limited by sluggish kinetics and severe interfacial issues in all-solid-state batteries. Here, a multi-functional interface modification strategy involving dispersed submicron single-crystal structure and multi-functional surface modification layer obtained through in-situ interfacial chemical reactions was designed to improve the electrochemical performance of Li-rich Mn-based cathodes in all-solid-state batteries. The design of submicron single-crystal structure promotes the interface contact between the cathode particles and the solid-state electrolyte,and thus constructs a more complete ion and electron conductive network in the composite cathode.Furthermore, the Li-gradient layer and the lithium molybdate coating layer constructed on the surface of single-crystal Li-rich particles accelerate the transport of Li ions at the interface, suppress the side reactions between cathodes and electrolyte, and inhibit the oxygen release on the cathode surface. The optimized Li-rich cathode materials exhibit excellent electrochemical performance in halide all-solid-state batteries. This study emphasizes the vital importance of reaction kinetics and interfacial stability of Lirich cathodes in all-solid-state batteries and provides a facile modification strategy to enhance the electrochemical performance of all-solid-state batteries based on Li-rich cathodes.

关 键 词：All-solid-state Li-ion batteries Li-rich Mn-based cathode materials KINETICS Interface Anion redox 

分 类 号：TM912[电气工程—电力电子与电力传动]