酰胺基体系低温电化学电解LiCl沉积金属锂

Electrochemical Deposition of Li from LiCl in Amide-based System with Low Temperature

以LiCl为原料,N,N-二甲基甲酰胺(DMF)为溶剂,直接室温电沉积制备金属锂。研究了二元DMF-LiCl体系的基础物化性质,计算得到了不同LiCl浓度下体系的电导活化能和黏流活化能。采用循环伏安法研究了不同LiCl浓度电解质体系的电化学特性,得出金属锂的氧化还原电位(2.5 V和-2.9 V,vs.Ag/Ag^(+))和沉积锂最优LiCl浓度(0.7 mol/L),最优LiCl浓度下锂离子扩散系数为2.6×10^(-8)cm^(2)/s。采用恒电位沉积,在高纯锡阴极上成功获得锂镀层内部晶粒较为致密的金属锂沉积物,镀层主要含金属锂及Li-Sn合金。

Li was prepared by direct electrodeposition with N,N-dimethylformamide(DMF)as solvent and LiCl as raw material.The basic physicochemical properties of the binary DMF-LiCl system were studied,and the conductivity activation energy and viscous flow activation energy at different LiCl concentrations were calculated;The electrochemical characteristics of electrolyte systems with different LiCl concentrations were studied by cyclic voltammetry.The redox potential of Li(2.5 V and-2.9 V,vs.Ag/Ag^(+))and the optimal LiCl concentration(0.7 mol/L)were obtained;The lithium ions diffusion coefficient is calculated to be 2.6×10^(-8)cm^(2)/s at the LiCl concentration of 0.7 mol/L.Using constant potential deposition,the metal lithium deposit with relatively dense grains in the lithium coating was successfully obtained on the high-purity tin cathode.The coating mainly contained metal lithium and Li-Sn alloy.