Precipitant-free solvothermal construction of spindle-like CoCO3/reduced graphene oxide hybrid anode toward high-performance lithium-ion batteries  

作　　者：Yu-Yan Wang Zhi-Wei Zhao Yang Liu Lin-Rui Hou Chang-Zhou Yuan 

机构地区：[1]School of Materials Science and Engineering,University of Jinan,Jinan 250022,China

出　　处：《Rare Metals》2020年第9期1082-1091,共10页稀有金属（英文版）

基　　金：financially supported by the National Natural Science Foundation of China(Nos.51772127 and 51772131);the Taishan Scholars(No.ts201712050);the Major Program of Shandong Province Natural Science Foundation(No.ZR2018ZB0317);the Natural Science Doctoral Foundation ofShandong Province(No.ZR2019BEM038);the Natural Science Doctoral Foundation of the University of Jinan(No.XBS1830);the Collaborative Innovation Center of Technology and Equipment for Biological Diagnosis and Therapy in Universities of Shandong。

摘　　要：Recently,CoCO3 has attracted enormous attention as anodes for lithium-ion batteries(LIBs),benefiting from its high theoretical capacity and simple synthesis.However,the modest electronic conductivity and structural instability over cycling hinder its wider applications.To well address the intrinsic issues,we explored a precipitantfree hydrothermal methodology for mass production of spindle-like CoCO3/reduced graphene oxide(S-CoCO3/rGO)toward advanced LIBs as a hybrid anode.The dimethylformamide plays a significant role of"two birds(i.e.,solvent and precipitant)with one stone"in the formation of the S-CoCO3/rGO,greatly improving its practical applicability.The purposeful introduction of rGO nanosheets as a two-dimensional flexible conductive network enhances the conductivity and stability of the S-CoCO3.It is the structural and compositional merits for LIBs that endow the S-CoCO3/rGO with remarkable lithium-storage performance in terms of enhanced interfacial storage capacity,high-rate reversible capacities(803 mAh·g-1 at 2.0 A·g-1)and long-duration capacity retention of 82.1%over 2000 consecutive cycles at 2.0 A·g-1.More significantly,the simple yet efficient avenue here promises enormous commercial prospect of the S-CoCO3/rGO in next-generation LIBs.

关 键 词：Spindle-like CoCO3 Reduced graphene oxide Precipitant-free synthesis Hybrid anodes Lithium-ion batteries 

分 类 号：TM912[电气工程—电力电子与电力传动]