亲锂Ag-3D-Cu电极的设计及电化学性质  

Design of a lithiophilic Ag-3D-Cu electrode and its electrochemical performance

作　　者：梁毅 韦韬 殷广达 黄德权 LIANG Yi;WEI Tao;YIN Guangda;HUANG Dequan(School of Automobile Engineering,Guilin University of Aerospace Technology,Guilin 541004,Guangxi,China)

机构地区：[1]桂林航天工业学院汽车工程学院,广西桂林541004

出　　处：《储能科学与技术》2025年第2期515-524,共10页Energy Storage Science and Technology

基　　金：广西高校中青年教师科研基础能力提升项目(2024KY0808,2021KY0792)。

摘　　要：锂金属负极具有高理论比容量和低电极电势,是高能量密度二次电池最理想的负极材料。然而锂金属负极循环过程中存在的锂枝晶生长及体积膨胀问题,限制了锂金属电池的商业化应用。本工作针对锂金属电池在循环中的锂枝晶生长及体积变化等问题,通过在泡沫铜表面化学镀银的方式制备具有亲锂性的Ag-3D-Cu集流体。银粒子可以引导锂离子均匀沉积并有效抑制锂枝晶生长,而且泡沫铜的三维多孔结构可以有效缓解体积膨胀。经过化学镀银30 s获得的Ag-3D-Cu-30 s电极展现出远低于3D-Cu的成核过电位和极化电压,同时实现了均匀的锂沉积。同时,Li||Ag-3D-Cu-30 s电池也呈现出接近140圈的稳定循环,电池的平均库仑效率仍然高达98%,表现出优异的循环性能。Ag-3D-Cu-30 s/Li||LFP(磷酸铁锂)全电池在1.0 C倍率下历经360次循环后,其放电比容量没有呈现出明显的衰退,表现出优异的循环稳定性,表明通过化学镀的方法构建的亲锂性Ag-3D-Cu集流体可以引导锂离子均匀沉积,有效降低锂的成核过电位和极化电压,提高锂金属电池的库仑效率及循环寿命。Lithium metal anode has a high theoretical specific capacity and low electrode potential.It is the ideal anode material for high-energy density secondary batteries.However,the growth of lithium dendrites and volume expansion during the cycling of lithium metal anode limit the commercial application of lithium metal batteries.In this study,the lithiophilic Ag-3D-Cu collector was prepared by electroless silver plating on the surface of foam copper to address dendrite growth and volume change in lithium metal anode during cycling.Silver particles can guide the uniform deposition of Li+and inhibit the growth of lithium dendrites,and the three-dimensional porous structure of foam copper can effectively alleviate the volume expansion.The Ag-3D-Cu-30 s electrode obtained after a chemical silver plating time of 30 s exhibits a lower overpotential for nucleation and polarization compared to 3D-Cu electrodes while achieving a uniform lithium deposition morphology.The Li||Ag-3D-Cu-30 s cell also shows stable cycling for nearly 140 cycles,with an average Coulombic efficiency of 98%,demonstrating excellent cycling performance.The specific discharge capacity of Ag-3D-Cu-30 s/Li||LFP full cell was maintained after 360 cycles at 1.0 C,demonstrating excellent cycling stability.These results indicate that by electroless silver plating on the surface of foam copper to construct lithiophilic Ag-3D-Cu electrode,silver particles can guide the uniform lithium deposition,effectively reducing the nucleation and polarization overpotential of lithium deposition,and improving the Coulombic efficiency and cycle life of lithium metal batteries.

关 键 词：锂金属负极 亲锂性 Ag-3D-Cu集流体 电化学性能 

分 类 号：TM911[电气工程—电力电子与电力传动]