Formation of MgO during Chemical Magnesiation of Mg-Ion Battery Materials

Chemical magnesiation of α-MnO 2 , V 2 O 5 , Mo 6 S 8 and h-TiO 2 using di-n-butylmagnesium/heptane and diphenylmagnesium/THF has been studied using a combination of long range (XRD) and short range (NMR) structural probes. XRD data shows no significant phase transformations in the bulk even though a color change has been observed for h-TiO 2 and V 2 O 5 after treatment. 25 Mg MAS NMR shows significant amorphous MgO formation for samples with color change suggestive of concomitant transition metal reduction on the surface. No significant bulk magnesiation due to intercalation has been observed for any of the oxides treated with di-n-butylmagnesium/heptane or diphenylmagnesium/THF solution.