Lithiophilic hyperbranched Cu nanostructure for stable Li metal anodes  

作　　者：Jianyu Chen Xin Qiao Wei Fu Xuran Han Qiang Wu Yizhou Wang Yu Zhang Li Shi Jin Zhao Yanwen Ma 

机构地区：[1]State Key Laboratory for Organic Electronics and Information Displays(KLOEID)&Jiangsu Key Laboratory for Biosensors,Institute of Advanced Materials(IAM),Nanjing University of Posts&Telecommunications,Nanjing,China [2]Materials Science and Engineering,King Abdullah University of Science and Technology(KAUST),Thuwal,Saudi Arabia [3]New Energy Technology Engineering Lab of Jiangsu Province,School of Science,Nanjing University of Posts&Telecommunications,Nanjing,China [4]Suzhou Vocational Institute of Industrial Technology,Suzhou,China

出　　处：《SmartMat》2023年第3期96-107,共12页智能材料（英文）

基　　金：Research Startup Fund from NJUPT,Grant/Award Numbers:NY220085,NY220069,NY221128;National Natural Science Foundation of China,Grant/Award Numbers:22201135,22203046,52102265,91963119;China Postdoctoral Science Foundation,Grant/Award Number:2020M681681;Project of State Key Laboratory of Organic Electronics and Information Displays,Nanjing University of Posts and Telecommunications,Grant/Award Numbers:GDX2022010010,GZR2022010017;Priority Academic Program Development of Jiangsu Higher Education Institutions,Grant/Award Number:PAPD,YX030003;Natural Science Foundation of Jiangsu Province,Grant/Award Numbers:BK20210604,BK20220385。

摘　　要：Porous copper(Cu)current collectors are regarded as a promising host for stabilizing lithium(Li)metal anodes but suffer from uncontrollable Li metal deposition due to the intrinsic lithiophobic nature of Cu.This study proposes a vertically aligned Cu host with hyperbranched CuxO nanostructure to provide lithiophilic nucleation sites for homogeneous Li metal deposition.Specifically,the vertically aligned Cu nanostructure dramatically reduces the local current density and brings homogeneous Li‐ion flux.The lithiophilic hyperbranched CuxO nanostructure with a low nucleation barrier could induce homogeneous Li nucleation and growth.As a result,the Cu@CuxO nanostructured host exhibits a low nucleation overpotential of 44.3 mV and achieves highly electrochemical reversibility with high Coulombic efficiency of 98.33%in a half‐cell.The Cu@CuxO nanostructured electrode is capable of working under different current densities varying from 0.5 to 5 mA/cm2 in a symmetric cell.The assembled full cell coupling of the Li/Cu@CuxO composite anode with the LiFePO4 cathode manifests stable long‐term cycling life at 1 C.This study elaborates on the synergistic effect of electrode structure design and interfacial chemistry modification to regulate the Li deposition/dissolution behavior,thus exhibiting remarkable electrochemical performances for next‐generation Li‐metal batteries.

关 键 词：current collector Li metal anode lithiophilicity low nucleation overpotential vertically aligned structure 

分 类 号：TB383[一般工业技术—材料科学与工程]