Abstract
SiOxis an attractive anode material given its high specific capacity and its increased lifetime due to its supporting matrix of lithium silicates irreversibly formed during its first lithiation. While SiOxis normally created by simultaneous evaporation and vapor deposition of Si and SiO2powders, this can be very difficult and energy consuming method. It is shown here that SiOxwith controlled oxygen content can be made by ball milling crystalline silicon powder in an oxidizing medium using two different milling techniques. To characterize the SiOxpowders, oxygen content is quantified using a KOH-based method and BET surface area is measured. Electrochemical testing using coin cells is completed and the results are compared to commercially available SiO samples. The results show that SiOxwith competitive properties can be made by ball milling. Further work is required to reduce the specific surface area of the material made by ball milling.
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