Planar Li growth on Li_(21)Si_(5)modified Li metal for the stabilization of anode  

作　　者：Liuyang Cao Xue Cheng Hongjie Xu Guoqin Cao Junhua Hu Guosheng Shao 

机构地区：[1]School of Materials Science and Engineering,Zhengzhou University,Zhengzhou 450001,China [2]State Center for International Cooperation on Designer Low-Carbon&1 Environmental Materials(CDLCEM),Zhengzhou University,Zhengzhou 450001,China [3]Zhengzhou Materials Genome Institute(ZMGI),Xingyang 450100,China [4]Institute for Renewable Energy and Environmental Technologies,University of Bolton,Bolton BL35AB,UK

出　　处：《Journal of Materials Science & Technology》2021年第17期156-165,共10页材料科学技术（英文版）

基　　金：the National Natural Science Foundation of China(Nos.51571182 and 51001091);the Fundamental Research Program from the Ministry of Science and Technology of China(No.2014CB931704);the Program for Science&Technology Innovation Talents in Universities of Henan Province(No.18HASTIT009);partially the Provincial Scientific Research Program of Henan(Nos.2017GGJS001 and 172102410023)。

摘　　要：Lithium(Li)metal is widely considered the ultimate anode for future rechargeable batteries.However,dendritic growth and related parasitic reactions during long-term cycling often lead to severe safety hazards and catastrophic failure.Herein,we fabricate a hybrid anode by coating single-phase Li_(21)Si_(5)on lithium metal.The resultant electrodes show a stable cycle and depressed polarization in symmetric and half cells.A planar plating/stripping behavior is observed on the modified anode.The investigation of the interplay of Li and Li_(21)Si_(5)shows relatively large adsorption energy in the Li-Si system.The deposition and stripping are surface processes,and Li_(21)Si_(5)maintains its intrinsic phase structure.The deposited Li layer around Li_(21)Si_(5)also has the advantage of diminished preferred orientation,which also contributes to the planar growth of Li.Both LiFePO4(LFP)and LiNi1/3Co1/3 Mn1/3O2(NCM)cathodes were applied to further demonstrate the enhanced rate and cycle performance.

关 键 词：Lithium anode Planar growth Density functional theory Core-shell structure Adsorption energy 

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]