一种Ag掺杂的石墨烯锂金属负极三维集流体  

An Ag-doped graphene three-dimensional collector of lithium metal anode

作　　者：肖菊兰 陈涛 李凤娇 刘洪利 彭彦森 XIAO Julan;CHEN Tao;LI Fengjiao;LIU Hongli;PENG Yansen(School of Electronic Engineering,Chengdu Technological University,Chengdu Sichuan 611730,China)

机构地区：[1]成都工业学院电子工程学院,四川成都611730

出　　处：《电源技术》2024年第2期253-258,共6页Chinese Journal of Power Sources

基　　金：成都工业学院项目(215086,2021ZR017,2022ZR035)。

摘　　要：锂金属负极在循环过程中会产生锂枝晶生长问题,导致电池循环寿命和库仑效率降低,甚至引起安全问题。锂枝晶生长的主要原因是锂金属负极中锂离子的电化学行为不受控引起的。为了解决这个问题,设计了一种由银(Ag)纳米颗粒、石墨烯和聚偏氟乙烯(PVDF)构成的锂金属负极集流体(GP@Ag)。利用银良好的亲锂特性及石墨烯对电子和锂离子的良好导电性,大大提高锂金属负极的电化学动力学性能。将所设计的集流体用于锂金属电池负极并进行电池性能测试,在1.0 C下循环350次,电池容量保持率可提高到93%,证明GP@Ag能有效抑制锂枝晶的生长,从而大大提高锂电池的循环寿命。The occurrence of lithium dendrite growth during the cycling of lithium metal anode,which is mainly caused by the uncontrolled electrochemical behavior of Li ions in Li metal anodes,may lead to the decrease of cycle life and coulombic efficiency of Li metal batteries,and even bring about safety hazards.In order to address the above problem,a lithium metal anode current collector(GP@Ag)composed of silver(Ag)nanoparticles,graphene,and polyvinylidene fluoride(PVDF)was designed.The electrochemical kinetic performance of the lithium metal anode was significantly improved by taking advantage of the excellent lithiophilic properties of silver and the excellent conductivity of graphene to electrons and lithium ions.An experiment was conducted to test the performance of a full lithium metal battery composed of a anode prepared by the GP@Ag and a LiFePO4(LFP)cathode.The battery capacity retention increases to 93%within 350 cycles at 1.0 C,proving that GP@Ag can effectively inhibit the growth of lithium dendrites,significantly improving the cycle life of lithium batteries.

关 键 词：锂枝晶 银纳米颗粒 石墨烯 电化学动力学性能 

分 类 号：TM912[电气工程—电力电子与电力传动]