电沉积制备金属锡薄膜负极材料及其电化学性能研究  

Electrochemical Performance of Metal Tin Film Anodes Prepared by Electrodeposition

作　　者：于利民 缪畅[1] 李锐 谭燚 肖围[1] YU Limin;MIAO Chang;LI Rui;TAN Yi;XIAO Wei(College of Chemistry and Environmental Engineering,Yangtze University,Jingzhou 434023,China)

机构地区：[1]长江大学化学与环境工程学院,荆州434023

出　　处：《人工晶体学报》2020年第12期2344-2349,共6页Journal of Synthetic Crystals

基　　金：国家自然科学基金(51874046);湖北省自然科学基金杰青项目(2020CFA090)。

摘　　要：通过电沉积法,控制电流密度在铜箔上得到不同形貌的金属锡薄膜,采用扫描电子显微镜、X射线衍射、恒流充放电测试、循环伏安、交流阻抗法对其进行物理和电化学性能表征。结果表明:当电流密度为2 mA/cm^2,所得金属锡薄膜表面最为致密,结晶度最高;将其作为负极材料组装成CR2025扣式电池,首次放电比容量为752 mAh/g,库伦效率为81.65%;30个循环后,放电比容量仍然维持在350 mAh/g。此外,该金属锡薄膜电极具有较高的电子导电性和锂离子扩散能力,其电荷转移电阻和锂离子扩散系数分别为113.3Ω和8.968×10^-17 cm^2/s。The metal tin films on a copper foil with different morphologies were synthesized by electrodeposition at different current densities.The physical and electrochemical properties were further characterized by scanning electron microscope,X-ray diffraction,galvanostatic discharge-charge test,cyclic voltammetry and electrochemical impedance spectroscopy.The results indicate that the electrodeposited metal tin films prepared at 2 mA/cm^2 possess the densest surface and highest crystallinity.When assembled into CR2025 coin cells as anode materials,the electrodeposited metal tin film electrode delivers an initial discharge specific capacity of 752 mAh/g with a high initial coulombic efficiency of 81.65%and still can maintain 350 mAh/g after 30 cycles.In addition,the electrodeposited metal tin film electrode exhibits high electronic conductivity and lithium ion diffusion ability,in which the initial charge transfer resistance and lithium ionic diffusion coefficient are 113.3Ωand 8.968×10^-17 cm^2/s,respectively.

关 键 词：金属锡薄膜 电沉积 电流密度 负极材料 电化学性能 

分 类 号：TM912[电气工程—电力电子与电力传动]