Ionic liquid assisted electrochemical coating zinc nanoparticles on carbon cloth as lithium dendrite suppressing host  

离子液体体系中电化学沉积纳米锌修饰碳布作为抑制锂枝晶的主体框架

作　　者：Yuhan Li Yuankun Wang Yuchuan Shi Hu Wu Jiacheng Zeng Huaitian Bu Min Zhu Chunhui Xiao Yanfeng Zhang Guoxin Gao Shujiang Ding 李宇寒;王元坤;石玉川;吴虎;曾嘉诚;Huaitian Bu;朱敏;肖春辉;张彦峰;高国新;丁书江(Department of Applied Chemistry,School of Science,State Key Laboratory of Electrical Insulation and Power Equipment,Xi’an Jiaotong University,Xi’an 710049,China;Department of Materials and Nanotechnology,SINTEF Industry,Forskningsveien 1,0373 Oslo,Norway)

机构地区：[1]Department of Applied Chemistry,School of Science,State Key Laboratory of Electrical Insulation and Power Equipment,Xi’an Jiaotong University,Xi’an 710049,China [2]Department of Materials and Nanotechnology,SINTEF Industry,Forskningsveien 1,0373 Oslo,Norway

出　　处：《Science Bulletin》2020年第13期1094-1102,M0004,共10页科学通报（英文版）

基　　金：supported partially by the National Natural Science Foundation of China (51973171, 51873170);the Young Talent Support Plan of Xi’an Jiaotong University。

摘　　要：The application of lithium metal anode with high specific capacity and energy density is limited by the volume expansion and pulverization caused by dendrite growth during cycle process.We propose a composite lithium anode by immersing molten lithium on the flexible three-dimensional(3D)carbon cloth scaffold with the zinc nanoparticles.The lithiophilic zinc nanoparticles layer of framework is synthesized by fast and easy electrochemical deposition from ionic liquid avoiding high temperature,high pressure and toxic reagent.The lithium is infused into the 3D lithiophilic framework,the composite anode is obtained.The steady network structure can confine the lithium and lead to Li dendrite restraining and reducing volume change due to the low interfacial resistance and reduce the effective current density,which induced the homogeneous Li growth.Benefiting from this,the Li infused 3D carbon cloth-Zn symmetric battery exhibits a low stripping/plating overpotential(~30 mV)and can be stable over 900 h at 1 mA cm-2.The Li//LiFePO4 battery delivers higher reversible capacity(140 mAh g^-1 at 2 C and 120 mAh g^-1 at 5 C)and stable cycling for 1500 and 2000 cycles than bare Li.高比容量、高能量密度锂金属负极的应用受到了电池循环过程中锂枝晶不规则生长的限制.本文通过在表面修饰纳米锌的3D碳布框架中熔融浸润锂金属制备成复合锂金属负极.利用电化学沉积在物理化学性质稳定的离子液体中对碳布修饰锌纳米层.在高温下,将熔融锂浸入碳布-纳米锌的框架制备出复合的锂金属负极.稳定的框架主体降低了有效电流密度和界面电阻,诱导锂的均匀生长,抑制了锂枝晶的形成和生长,因此缓解了锂负极的体积膨胀和粉化情况.基于以上原因,3D碳布-锌-锂金属复合负极组成的对称电池表现出了较低的过电势和长循环稳定性.在锂金属/磷酸铁锂全电池中展示出了超长的电化学循环稳定性.

关 键 词：3D carbon cloth Ionic liquid Li infusion Steady host Lithium metal battery 

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]