电解质
循环伏安法
锂(药物)
介电谱
电化学
电极
材料科学
俄歇电子能谱
扫描电子显微镜
表面改性
无机化学
分析化学(期刊)
化学
化学工程
复合材料
工程类
色谱法
医学
物理
内分泌学
物理化学
核物理学
作者
Mingmei Wu,Wen Zhang,Yu Liu,Xiuyan Wang,Linjuan Huang
标识
DOI:10.1016/j.jpowsour.2011.05.035
摘要
A lithium conductive Li3N film is successfully prepared on Li metal surface by the direct reaction between Li and N2 gas at room temperature. X-ray diffraction (XRD), Auger electron spectroscopy (AES), cyclic voltammetry (CV), scanning electron microscopy (SEM), AC impedance, cathodic polarization and galvanostatic charge/discharge cycling tests are applied to characterize the film. The experimental results show that the Li3N protective film is tight and dense with high stability in the electrolyte. Its thickness is more than 159.4 nm and much bigger than that of a native SEI film formed on the lithium surface as received. An exchange current as low as 3.244 × 10−7 A demonstrates the formation of a complete SEI film at the electrode|electrolyte interface with Li3N modification. The SEI film is very effective in preventing the corrosion of the Li electrode in liquid electrolyte, leading to a decreased Li|electrolyte interface resistance and an average short distance of 3.16 × 10−3 cm for Li ion diffusion from electrolyte to Li surface. The Li cycling efficiency depends on N2 exposing time and is obviously enhanced by the Li3N (1 h) modification. After cycling, a dense and homogeneous Li layer deposits on the Li3N (1 h) modified Li surface, instead of a loose and inhomogeneous layer on the Li surface as received.
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