Silicon Mesoporous Battery Anodes

Using mesostructured materials to allow for non-destructive volume expansion of an extrememely high capacity material


We produce mesoporous silicon through the reduction of porous silica thin films in magnesium vapor at elevated temperature. Magnesium reduction preserves the ordered pore-solid architecture but replaces the dense silica walls with 10-17 nm silicon crystallites. Our mesoporous silicon has been tested for lithium intercalation, and shows both a high intercalation rate and good cycleability compared to data reported for silicon nanowires. These materials may thus have interesting potential for use as anode materials for lithium ion batteries.

Mesoporous Si keeps its structure             Mesoporous Si SEM