Boosting the Electrochemical Performance of Li-and Mn-Rich Cathodes by a Three-in-One Strategy  

作　　者：Wei He Fangjun Ye Jie Lin Qian Wang Qingshui Xie Fei Pei Chenying Zhang Pengfei Liu Xiuwan Li Laisen Wang Baihua Qu Dong-Liang Peng 

机构地区：[1]State Key Lab of Physical Chemistry of Solid Surface,Collaborative Innovation Center of Chemistry for Energy Materials,College of Materials and Pen-Tung Sah Institute of Micro-Nano Science and Technology,Xiamen University,Xiamen 361005,People’s Republic of China [2]College of Chemistry and Chemical Engineering,Xiamen University,Xiamen 361005,People’s Republic of China [3]Zhengzhou Key Laboratory of Big Data Analysis and Application,Henan Academy of Big Data,Zhengzhou University,Zhengzhou 450002,People’s Republic of China [4]Fujian Provincial Key Laboratory of Light Propagation and Transformation,College of Information Science and Engineering,Huaqiao University,Xiamen 361021,People’s Republic of China [5]Shenzhen Research Institute of Xiamen University,Shenzhen 518000,People’s Republic of China

出　　处：《Nano-Micro Letters》2021年第12期311-321,共11页纳微快报（英文版）

基　　金：financially supported by the National Natural Science Foundation of China(Grant Nos.51931006 and 51871188);the National Key R&D Program of China(No.2016YFA0202602);the Science and Technology Plan-ning Projects of Fujian Province of China(Grant No.2020H0005);the Natural Science Foundation of Fujian Province of China(No.2020J05014);Guangdong Basic and Applied Basic Research Foundation(Nos.2021A1515010139 and 2019A1515011070);the Fundamental Research Funds for the Central Universities of China(Xiamen University:Nos.20720200068,20720190013,and 20720200080);the“Double-First Class”Foundation of Mate-rials Intelligent Manufacturing Discipline of Xiamen University。

摘　　要：There are plenty of issues need to be solved before the practi-cal application of Li-and Mn-rich cathodes,including the detrimental voltage decay and mediocre rate capability,etc.Element doping can e ectively solve the above problems,but cause the loss of capacity.The introduction of appropriate defects can compensate the capacity loss;however,it will lead to structural mismatch and stress accumulation.Herein,a three-in-one method that combines cation–polyanion co-doping,defect construction,and stress engineering is pro-posed.The co-doped Na^(+)/SO_(4)^(2-)can stabilize the layer framework and enhance the capacity and voltage stability.The induced defects would activate more reac-tion sites and promote the electrochemical performance.Meanwhile,the unique alternately distributed defect bands and crystal bands structure can alleviate the stress accumulation caused by changes of cell parameters upon cycling.Consequently,the modified sample retains a capacity of 273 mAh g^(-1)with a high-capacity retention of 94.1%after 100 cycles at 0.2 C,and 152 mAh g^(-1)after 1000 cycles at 2 C,the corresponding voltage attenuation is less than 0.907 mV per cycle.

关 键 词：Li-and Mn-rich cathodes Cation–polyanion co-doping Defect and stress engineering Good structure stability Electrochemical performance 

分 类 号：TM912[电气工程—电力电子与电力传动] O646.5[理学—物理化学]