Self-template formation of porous yolk-shell structure Mo-doped NiCo2O4 toward enhanced lithium storage performance as anode material  

作　　者：Yongqiang Ren Xiuyan Li Yinan Wang Qinghua Gong Shaonan Gu Tingting Gao Xuefeng Sun Guowei Zhou 

机构地区：[1]Key Laboratory of Fine Chemicals in Universities of Shandong,Jinan Engineering Laboratory for Multi-scale Functional Materials,School of Chemistry and Chemical Engineering,Qilu University of Technology(Shandong Academy of Sciences),Jinan 250353,China [2]School of Chemical Engineering and Environment,Shandong Peninsula Engineering Research Center of Comprehensive Brine Utilization,Weifang University of Science and Technology,Weifang 262700,China

出　　处：《Journal of Materials Science & Technology》2022年第7期186-194,共9页材料科学技术（英文版）

基　　金：financially supported by the National Natural Science Foundation of China (Nos. 51972180, 51572134 and 41907315);the Key Technology Research and Development Program of Shandong (No. 2019GGX102070);the Program for Scientific Research Innovation Team in Colleges and Universities of Jinan (No. 2018GXRC006)。

摘　　要：Hollow ternary metal oxides have shown enormous potential in lithium-ion batteries(LIBs),which is ascribed to their complex chemical composition,abundant active defect sites,and the synergy effect be-tween metals.In this work,we synthesized Mo-doped NiCo_(2)O_(4) porous spheres with yolk-shell structure by using a simple self-templating method.Surprisingly,other than the yolk-shell structure we had ob-tained,the inner core of the yolk-shell was also porous,which could fully enhance the electrolyte infil-tration and promote the transmission of lithium ions(Li+)and electrons(e−).The diameter of the porous core in the yolk-shell sphere was about 530 nm,and the outer shell’s thickness was up to 110 nm.In addition,the unique pores in the core appeared in the diameter of about 85 nm.With this structure,the volume expansion of the anode could be well inhibited during charge/discharge.It exhibited prominent electrochemical performance with high reversible capacity(1338 mA h g^(−1) at 100 mA g^(−1)),satisfactory cycle life(1360 mA h g^(−1) after 200 cycles at 100 mA g^(−1)),and exceptional rate capability(820 mA h g^(−1) at 2000 mA g^(−1))as anode material in LIBs.

关 键 词：Ternary metal oxides Yolk-shell structure Porous inner core Anode material Lithium-ion batteries 

分 类 号：TM912[电气工程—电力电子与电力传动]