Surface engineering for high stable lithium-rich manganese-based cathode materials  

作　　者：Miaomiao Zhou Jianjun Zhao Xiaodong Wang Ji Shen Wenhao Tang Yirui Deng Ruiping Liu 

机构地区：[1]School of Chemical&Environmental Engineering,China University of Mining and Technology(Beijing),Beijing 100083,China [2]State Key Laboratory of Chemical Resources Engineering,Beijing Advanced Innovation Center for Soft Matter Science and Engineering,College of Chemistry,Beijing University of Chemical Technology,Beijing 100029,China [3]Department of Materials Science and Engineering,China University of Mining&Technology(Beijing),Beijing 100083,China

出　　处：《Chinese Chemical Letters》2023年第6期588-593,共6页中国化学快报（英文版）

基　　金：supported by the Fundamental Research Funds for the Central Universities(No.2021JCCXJD01);Key R&D and transformation projects in Qinghai Province(No.2021-HZ-808);Hebei Province(No.21314401D)。

摘　　要：Lithium-rich manganese-based material shows great potential as the high specific cathode materials due to its low cost,environmental friendliness,high operating voltage and simple preparation process.However,the poor capacity retention and cycling performance caused by its unstable structure during cycling restrict the commercialization.In this work,Li_(1.2)Ni_(0.16)Mn_(0.56)Co_(0.08)O_(2)was synthesized utilizing a Coprecipitation method and different amount of La(PO_(3))_(3)(La(PO_(3))_(3)=2 wt%,4 wt%and 6 wt%)was selected as the coating layer to resolve the above issues.During the calcination process,La(PO_(3))_(3)reacts with impurities such as Li OH and Li_(2)CO_(3)on the lithium-rich surface to reduce the residual lithium on the surface,thus improving the interfacial stability,slowing down the corrosion of the electrolyte,and finally enhancing its electrochemical performance.The cathode materials coated with 4%of La(PO_(3))_(3)showed the best electrochemical performance in terms of capacity retention and cycling performance compared to the pristine NCM.The high initial discharge capacity of 214.21 m Ah/g and capacity retention of 94.2%after 100 cycles at 0.1 C can be obtained.This work provides an effective strategy to protect the cathode from corrosion and will promote its further practical applications in high specific Li-ion batteries.

关 键 词：Li-rich layered oxide Li-ion batteries La(PO_(3))_(3)coating Electrochemical performance Structure stability 

分 类 号：TQ131.11[化学工程—无机化工] TM912[电气工程—电力电子与电力传动]