Abstract
Energy storage system has become a critical technology for solving the oil crisis, and the lithium ion battery is one of the promising energy storage systems owing to the high theoretical energy and power density. Moreover, Silicon – based anode materials for lithium ion battery have been widely studied in recent years because the high specific capacities of silicon. This study uses Taguchi method to optimize the synthesis processes of porous silicon nanoparticles to improve the cycle life performance in lithium ion batteries. In the processes of SiO2 synthesis, there is a best ratio of CTACl / TEOS, 0.058, to form pores in nanoparticles, and a ratio of TOEA / TEA to form minimum particles. In the processes of Mg reduction, the best parameters for cycle life performance are: Outer pressure = 0.75 torr, Mg / SiO2 = 4, temperature = 625 oC, time = 6 hr. We conclude that the effect of porosity with large pore volume is less effective than that of particle size on the cycle life performance.