In Situ Reaction Fabrication of a Mixed-Ion/Electron-Conducting Skeleton Toward Stable Lithium Metal Anodes

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外文摘要：Lithium metal batteries are emerging as a strong candidate in the future energy storage market due to its extremely high energy density.However,the uncontrollable lithium dendrites and volume change of lithium metal anodes severely hinder its application.In this work,the porous Cu skeleton modified with Cu6Sn5 layer is prepared via dealloying brass foil following a facile electroless process.The porous Cu skeleton with large specific surface area and high electronic conductivity effectively reduces the local current density.The Cu6Sn5 can react with lithium during the discharge process to form lithiophilic Li7Sn2 in situ to promote Li-ions transport and reduce the nucleation energy barrier of lithium to guide the uniform lithium deposition.Therefore,more than 300 cycles at 1 mA cm-2 are achieved in the half-cell with an average Coulombic efficiency of 97.5％.The symmetric cell shows a superior cycle life of more than 1000 h at 1 mA cm-2 with a small average hysteresis voltage of 16 mV.When coupled with LiFePO4 cathode,the full cell also maintains excellent cycling and rate performance.

外文关键词：

Cu6Sn5 layerdendrite-free lithium metal anodelithiophilic Li7Sn2 alloylow diffusion energy barrierporous Cu skeleton

作者：

Juhong He、Liufeng Ai、Tengyu Yao、Zhenming Xu、Duo Chen、Xiaogang Zhang、Laifa Shen

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作者单位：

Jiangsu Key Laboratory of Electrochemical Energy-Storage Technologies,College of Materials Science and Technology,Nanjing University of Aeronautics and Astronautics,Nanjing 210016,China

基金：

National Natural Science Foundation of ChinaJiangsu Province Outstanding Youth FundInternational Cooperation of Jiangsu Province

项目编号：

52072173BK20200016SBZ2022000084

出版年：

2023

DOI：

10.1002/eem2.12614

能源与环境材料(英文)

CSCD

ISSN：

年,卷(期)：2023.6(4)

参考文献量47