Homogeneous bottom-growth of lithium metal anode enabled by double-gradient lithiophilic skeleton  

作　　者：Li Zhang Hongfei Zheng Ben Liu Qingshui Xie Qiulin Chen Liang Lin Jie Lin Baihua Qu Laisen Wang Dong-Liang Peng 

机构地区：[1]State Key Laboratory for Physical Chemistry of Solid Surfaces,Fujian Key Laboratory of Materials Genome,Collaborative Innovation Center of Chemistry for Energy Materials,College of Materials,Xiamen University,Xiamen 361005,Fujian,China [2]Pen-Tung Sah Institute of Micro-Nano Science and Technology,Xiamen University,Xiamen 361005,Fujian,China

出　　处：《Journal of Energy Chemistry》2021年第6期392-400,I0010,共10页能源化学（英文版）

基　　金：financial support from the National Natural Science Foundation of China(Grant Nos.51701169,51871188 and 51931006);the National Key R&D Program of China(Grant No.2016YFA0202602);the Natural Science Foundation of Fujian Province of China(No.2019J06003);the "Double-First Class" Foundation of Materials and Intelligent Manufacturing Discipline of Xiamen University。

摘　　要：Lithium(Li) metal is considered as the most promising anode material for the next-generation high performance Li batteries.However,the uncontrollable dendritic growth impedes its commercial application.Herein,we design a 3 D Si@carbon nanofibers(CNFs)@ZnO-ZnO-Cu skeleton(SCZ) for guiding the homogeneous bottom-growth of Li metal.The top LixSi@CNFs and bottom LiyZn@CNFs layers could form conductivity and overpotential gradient to avoid the "top-growth" of Li metal.Moreover,the top lithiophilic LixSi@CNFs layer could regulate the nucleation and deposition of Li-ions even if the lithium dendrites grow out of the skeleton under high capacity Li deposition(30 mAh cm^(-2)).As a result,the SCZ-Li||LiFePO_(4) full cell delivers a high capacity of ~104 mAh g^(-1)(~94.82% capacity retention) after 2000 cycles at 5 C, elucidating the potential application of the 3 D double-gradient Li metal composite anode.

关 键 词：Double-gradient skeleton Homogeneous Li growth Lithium dendrite Lithium anode Bottom growth 

分 类 号：TM912[电气工程—电力电子与电力传动] TG146.26[一般工业技术—材料科学与工程]