engleski

Novel honeycomb silicon structure as potential anode material for Li-ion cells

Silicon stands out as next generation anode material due to its superior theoretical specific capacity of 4200 mAh / g which is a result of intercalation 4.4 Li into Si at high temperature to form Li15Si4.[1] .The porous structure can provide a large space to accommodate volume expansion and provide a large surface area for lithium-ion transport from electrolyte to silicon. Porous silicon with high surface can improve accessibility of the electrolyte to silicon and increase lithium diffusion length which increase capacity[2]. Magnesiothermic reduction (MRR) of silica (SiO2) is a facile method for the synthesis of porous silicon spheres at lower temperatures than conventional silica reduction methods[2]. In this work, honeycomb Si nanostructure was prepared by MRR method and treated with silver ions (Ag+) which are reduced to form Ag nanoparticles. The Ag nanoparticles were placed within the pores thus being directly connected to both the silicon structure as well as the current collector, which results in improved electrochemical performance of the honeycomb structure[3].The aim of this work is to investigate the mechanism and kinetics of Li+ ions intercalation in the porous structure of newly prepared materials as potential anodes for Li-ion batteries.

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

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