Electrochemical Performance of Metal Tin Film Anodes Prepared by Electrodeposition

Abstract

Abstract: 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/cm² 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 113.3 Ω and 8.968×10^-17 cm²/s, respectively.

Key words: metal tin film, electrodeposition, current density, anode material, electrochemical performance

CLC Number:

TM912

YU Limin, MIAO Chang, LI Rui, TAN Yi, XIAO Wei. Electrochemical Performance of Metal Tin Film Anodes Prepared by Electrodeposition[J]. Journal of Synthetic Crystals, 2020, 49(12): 2344-2349.

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