Electrochemical performances of nanostructured Ni 3P-Ni films electrodeposited on nickel foam substrate
Ni 3P-Ni films were deposited on nickel foam substrates by electrodeposition in an aqueous solution. The structure and morphology of the electrodeposited films were characterized using X-ray diffraction (XRD) and scanning electron microscope (SEM). The annealed electrodeposited films consisted of tetragonal structured Ni 3P and cubic metal Ni. As anode for lithium ion batteries, the electrochemical properties of the Ni 3P-Ni films were investigated by cyclic voltammetry (CV), electrochemical impedance spectrum (EIS) and galvanostatic charge-discharge tests. The electrodeposition time had a significant effect on the electrochemical performances of the films. The Ni 3P-Ni film electrodeposited for 20 min delivered the initial discharge capacity of 890 mAh g -1. Although the irreversible capacity at the first cycle was relative large, the Ni 3P-Ni film exhibited good cycling stability and its discharging capacity still maintained 340 mAh g -1 after 40 cycles.