轻质三维多孔泡沫铝用作高性能锂金属负极骨架  

Lightweight 3D porous Al foams for the hosts of high-performance Li metal anodes

作　　者：江伟伟 李俊杰 叶承舟 张婧[1] 黄龙[1] 吴熙 胡振民 李文集 戴煜 孙福根 JIANG Wei-Wei;LI Jun-Jie;YE Cheng-Zhou;ZHANG Jing;HUANG Long;WU Xi;HU Zhen-Min;LI Wen-Ji;DAI Yu;SUN Fu-Gen(School of Physics and Materials Science,Nanchang University,Nanchang 330031,China)

机构地区：[1]南昌大学物理与材料学院,南昌330031

出　　处：《无机化学学报》2023年第2期291-299,共9页Chinese Journal of Inorganic Chemistry

基　　金：国家自然科学基金项目(No.51962022);江西省自然科学基金项目(No.20212ACB214012);中央引导地方科技发展项目(No.20202ZDB01008)资助。

摘　　要：将轻质、三维多孔且亲锂的泡沫铝用作锂(Li)金属负极骨架,通过简单的机械挤压方法,将泡沫铝与金属Li复合,制得Al@Li复合负极。泡沫铝自身的高亲锂性,能够为Li金属成核提供丰富且均匀的活性位点,诱导Li在泡沫铝内部的快速成核和均匀电沉积。同时,泡沫铝的三维多孔结构,可以容纳Li金属负极在充放电过程中的巨大体积应变,降低局部电流密度,从而有效抑制Li枝晶的生长。因此,与纯Li金属负极相比,所获得的Al@Li复合负极在对称电池和LiFePO_(4)||Al@Li半电池中,均表现出了更加优异的循环稳定性。Lightweight,3D porous,and lithiophilic Al foams has been used as the hosts for Li metal anodes,and compounded with metallic Li by a facile mechanical extrusion method to obtain the Al@Li composite anodes.The high lithiophilicity of Al foams could provide abundant and uniform active sites for Li nucleation,thus inducing the fast nucleation and uniform electro-deposition of Li metal into the Al foams.Moreover,the 3D porous structures of Al foams could accommodate the huge volume change of Li metal anodes during the charge/discharge process and reduce the local current density,thus effectively inhibiting the growth of Li dendrites.Therefore,compared with the bare Li metal anodes,the obtained Al@Li composite anodes exhibited higher cycling stability of Li plating/stripping with a lower overpotential of ca.5 mV at 1 mA·cm-2after 250 cycles in their symmetric cells.Furthermore,half-cell configurations with the Al@Li composite anodes and LiFePO_(4)cathodes also presented significantly enhanced cycling capacity and rate performance.

关 键 词：锂二次电池 Li金属负极 泡沫铝 Li枝晶 

分 类 号：O646.21[理学—物理化学]