Study on Preparation and Electrochemical Performance of Carbon-coated Porous Silicon-Nickel Alloy Anode

The carbon-coated porous silicon-nickel alloy anode was successfully prepared based on as-cast Ni₅₃Si₄₇ alloy by using dealloying and sol-gel pyrolysis methods.The crystalline phases, microstructure and chemical composition of the carbon-coated porous silicon-nickel alloy anode were characterized by XRD, SEM, EDS and XRF, and the electrochemical properties were investigated.The results show that the carbon-coated porous silicon-nickel alloy anode exhibits typical nanoporous structure with uniformly coated carbon layer.It displays initial charge/discharge specific capacity of 1156.80/2243.82 mA·h/g at current density of 0.1 mA/g, and it operates steadily with reversible specific capacity of 771.20 mA·h/g and capacity retention rate of 66.67%after 60 cycles and demonstrates excellent cycling stability.