Unlocking fast Li-ion transport in micrometer-sized Mn-based cation-disordered rocksalt cathodes  

作　　者：Yuchen Zhang Hao Chen Runze Yu Wei Yang Jia He Haoyang Li Xianhu Sun Zhengyan Lun 

机构地区：[1]School of Chemical Sciences,University of Chinese Academy of Sciences,Beijing 100049,China [2]Binzhou Institute of Technology,Weiqiao-UCAS Science and Technology Park,Binzhou 256606,Shandong,China [3]Department of Materials Science and Engineering,Tsinghua Shenzhen International Graduate School,Shenzhen 518055,Guangdong,China

出　　处：《Journal of Energy Chemistry》2024年第12期645-653,共9页能源化学（英文版）

基　　金：funding support from the National Natural Science Foundation of China;the Institute of WeiqiaoUCAS Science and Technology;the Fundamental Research Funds for the Central Universities。

摘　　要：The development of cation-disordered rocksalt(DRX)cathodes has garnered worldwide attention due to their high capacity,broad chemical space and excellent structural flexibility.However,their low intrinsic Li-ion conductivity necessitates extensive particle pulverization,typically achieved through ball-milling process,which impedes large-scale production.In this work,we present a proton-exchange assisted strategy to activate the Li-ion transport in Mn-based DRX cathodes.Short-range spinel-like ordering is observed to form within the DRX matrix after the post treatment,which significantly enhances the intrinsic Li ion mobility.Notably,more than 280 mAh g^(-1)discharge capacity can be delivered at a slow rate from micrometer-sized particles with an overall disordered cation arrangement,which retains more than150 m Ah g^(-1)when cycled at a very high rate of 2000 mA g^(-1).Furthermore,we also demonstrate that the electrochemical performance of the post-treated cathodes can be further optimized by fine-tuning the reaction parameters.

关 键 词：Cation-disordered rocksalt cathodes Partially-disordered spinel PROTON-EXCHANGE Short-range order 

分 类 号：TM912[电气工程—电力电子与电力传动] O646.541[理学—物理化学]