I need Si not SiO2 for Lithium to bond to in the anode, ball milling with aluminum and then heating to 350 degrees celcius should allow a reduction of silica to silicon.

http://scitation.aip.org/content/aip/journal/jap/80/11/10.1063/1.363669

This paper describes the failure of diodes made with Al SiO2 Si do to high temperature.