Facile one-step vulcanization of copper foil towards stable Li metal anode  

利用简单硫化处理的铜箔获取稳定的金属锂负极

作　　者：Danqi He Yaqi Liao Zexiao Cheng Xiahan Sang Lixia Yuan Zhen Li Yunhui Huang 贺丹琪;廖亚祺;程泽晓;桑夏晗;袁利霞;李真;黄云辉(State Key Laboratory of Material Processing and Die and Mold Technology,School of Materials Science and Engineering,Huazhong University of Science and Technology,Wuhan 430074,China;State Key Laboratory of Advanced Technology for Materials Synthesis and Processing,Wuhan University of Technology,Wuhan 430070,China)

机构地区：[1]State Key Laboratory of Material Processing and Die and Mold Technology,School of Materials Science and Engineering,Huazhong University of Science and Technology,Wuhan 430074,China [2]State Key Laboratory of Advanced Technology for Materials Synthesis and Processing,Wuhan University of Technology,Wuhan 430070,China

出　　处：《Science China Materials》2020年第9期1663-1671,共9页中国科学（材料科学（英文版）

基　　金：supported by the National Key R&D Program of China(2018YFB0905400);the National Natural Science Foundation of China(51632001 and 51972131);Chinese Postdoctoral Science Foundation。

摘　　要：Lithium metal has been regarded as the ultimate anode for next-generation rechargeable batteries with high energy density.However,its high reactivity and dendrite growth seriously limit its commercial application,which can be well addressed by realizing uniform Li deposition.Here,we report a facile and scalable one-step vulcanization method to modify commercial Cu foil with lithophilic Cu2S.The in situ formed Cu2S layer can not only promote the homogeneous deposition of Li via its lithophilic nature,but also benefit the formation of a stable solid-electrolyte interphase during initial activation.The Cu2S-modified Cu current collector realizes dendrite-free Li plating/stripping and thus exhibits stable cycling performance with a high Coulombic efficiency,even with a large capacity of 4 mA h cm^-2.A full-cell consisting of a Cu2S/Cu-Li anode and a LiFePO4 cathode exhibits greatly improved cycling stability and enhanced Coulombic efficiency,demonstrating the effectiveness and practicability of the proposed Cu2S/Cu foil in the field of rechargeable Li metal batteries.金属锂被认为是下一代高能量密度二次电池的终极形式.但是,金属锂的高活性和枝晶生长严重限制了其商业化应用.只有实现锂离子的均匀沉积才能解决相关问题.本研究通过对商业化铜箔进行简单的一步法硫化处理,在其表面原位生成一层具有亲锂性的Cu2S修饰层.该Cu2S层不仅可以利用其亲锂性促进锂离子的均匀沉积,而且在初始活化过程中有利于形成稳定的固态电解质界面.在锂沉积/剥离循环过程中,这种经过修饰的铜箔集流体有效抑制了锂枝晶生长,即使在4 mA h cm^-2的循环条件下,也能够展现出较高的库仑效率和稳定的循环性能.将沉积金属锂后的Cu2S/Cu-Li复合负极与Li Fe PO4正极组装成全电池,其循环稳定性和库仑效率均大幅度提高,表明该修饰后的铜箔在二次金属锂电池领域具有良好的应用前景.

关 键 词：lithium metal anode current collector lithophilic layer copper sulfide electrochemical performance 

分 类 号：TM912[电气工程—电力电子与电力传动] TB33[一般工业技术—材料科学与工程]