Homogenous metallic deposition regulated by abundant lithiophilic sites in nickel/cobalt oxides nanoneedle arrays for lithium metal batteries  

作　　者：Fenqiang Luo Dawei Xu Yongchao Liao Minghao Chen Shuirong Li Dechao Wang Zhifeng Zheng 

机构地区：[1]Fujian Provincial Industry Technologies Development Base for New Energy,Fujian Provincial Engineering and Research Center of Clean and High-valued Technologies for Biomass,Xiamen Key Laboratory for High-valued Conversion Technology of Agricultural Biomass,College of Energy,Xiamen University,Xiamen 361102,Fujian,China [2]China Fujian Innovation Laboratory of Energy Materials Science and Technology(Tan Kah Kee Innovation Laboratory),Xiamen 361102,Fujian,China

出　　处：《Journal of Energy Chemistry》2023年第2期11-18,I0001,共9页能源化学（英文版）

基　　金：supported by the National Natural Science Foundation of China(31870570);the Science and Technology Plan of Fujian Provincial,China(2020H4026,2022G02020 and 2022H6002);the Science and Technology Plan of Xiamen(3502Z20203005);the Scientific Research Start-up Funding for Special Professor of Minjiang Scholars。

摘　　要：Although lithium(Li)metal delivers the highest theoretical capacity as a battery anode,its high reactivity can generate Li dendrites and"dead"Li during cycling,resulting in poor reversibility and low Li utilization.Inducing uniform Li plating/stripping is the core of solving these problems.Herein,we design a highly lithiophilic carbon film with an outer sheath of the nanoneedle arrays to induce homogeneous Li plating/stripping.The excellent conductivity and 3D framework of the carbon film not only offer fast charge transport across the entire electrode but also mitigate the volume change of Li metal during cycling.The abundant lithiophilic sites ensure stable Li plating/stripping,thereby inhibiting the Li dendritic growth and"dead"Li formation.The resulting composite anode allows for stable Li stripping/plating under 0.5 mA cm^(-2) with a capacity of 0.5 mA h cm^(-2) for 4000 h and 3 mA cm^(-2) with a capacity of3 mA h cm^(-2) for 1000 h.The Ex-SEM analysis reveals that lithiophilic property is different at the bottom,top,or channel in the structu re,which can regulate a bottom-up uniform Li deposition behavior.Full cells paired with LFP show a stable capacity of 155 mA h g^(-1) under a current density of 0.5C.The pouch cell can keep powering light-emitting diode even under 180°bending,suggesting its good flexibility and great practical applications.

关 键 词：Nickel/cobalt oxides Nanoneedle arrays Lithiophilic sites Lithium metal batteries 

分 类 号：TM912[电气工程—电力电子与电力传动] TB383.1[一般工业技术—材料科学与工程]