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Ag decorated porous Si structure as potential anode material for Li-ion cells

Honeycomb silicon structure (HCSi) was prepared by magnesiothermic reduction of the synthesized SiO2 and investigated as a potential anode material for Li-ion batteries. The characterization of HCSi powder showed the mean particle size of ≈30-40 nm and BET surface area of 102.22 m2/g. In order to increase the conductivity of HCSi, Ag nanoparticles were deposited on HCSi in different amounts. Sample HCSi10, which had the highest Ag content, showed the highest conductivity of 1.379 × 103 S/cm and lower BET surface (34.04 m2/g) which is suitable for anode material. These three materials were investigated as anode material in Li-ion cells and their electrochemical properties were investigated by chronoamperometry, cyclic voltammetry and electrochemical impedance spectroscopy. The enhanced electrochemical performance of sample HCSi10 is attributed to the lowest impedance, highest intercalation intensity and current which results in specific capacity of 3333 mAh/g at 0.067 A/g.

silver nanoparticles, porous silicon, silicon anode, Li-ion battery, Li+ intercalation

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