In this study, the porous Silicon/Carbon anode composite material was prepared using etched silicon alloy

for high-capacity lithium-ion batteries. The silicon/carbon composite was synthesized from low-cost silicon alloy

prepared by acid etching and ball-milling, followed by polymerization of dopamine. The physical properties of the

composite were analyzed by HR-SEM, EDS, XRD, PSD, BET and TGA. The electrochemical characteristics of the

composites were investigated by cycle, rate performance, dQ/dV, and EIS tests in the electrolyte of 1 M LiPF6 (EC:

DEC=1:1 v/v%, FEC 10 vol%). The Si/C-2.5 anode composite (Si:C=1:2.5 wt%) showed discharge capacity of 2257.8

mAh/g with 83.6 % capacity retention after 100 cycles, and exhibited high capacity of 1207.1 mAh/g at the current rate

of 2 C. The electrochemical property of Si/C-2.5 anode composite was more improved than that of the composites with

other contents of carbon.

Si alloy, Porous silicon, Dopamine, Anode, Lithium ion battery

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