Facile preparation and electrochemical properties of amorphous SiO2/C composite as anode material for lithium ion batteries

A hybrid Si@FeSiy/SiOx anode structure for high performance lithium-ion batteries via ammonia-assisted one-pot synthesis

“…Silicon possesses a theoretical specic capacity of 3580 mA h g À1 at the highest accessible lithiation state of Li 15 Si 4 at room temperature. 1 This is nearly ten times greater than that of commercialized graphite (372 mA h g À1 ).…”

“…However, nanostructured or amorphous SiO 2 is lithium reactive. 15 4 SiO 4 are commonly irreversible. However, those can serve as buffers to alleviate the volume expansion of Si in subsequent cycles.…”

Effective and highly recyclable ceramic membrane based on amorphous nanosilica for dye removal from the aqueous solutions

“…As displayed in Fig. 2A, a wide and a broad peak between 17°and 38°centered at 22°corresponds to the crystal planes of (1 0 1) indicating the amorphous (cristobalite) nature of the silica (JCPDS card No 21-1272) (Lv et al, 2013). In addition, the nonappearance of other sharp peaks of possible impurities such as alkaline earth metals confirms the purity of the as-derived silica.…”

Facile Fabrication of 3D SiO2@Graphene Aerogel Composites as Anode Material for Lithium Ion Batteries

“…So far, silicon dioxide (SiO 2 ) has been suggested to improve the cycling performance of silicon-based anode [5,[10][11][12]. The lithiation of SiO 2 results in the formation of nano-Si domains and inert lithium silicates (Li 4 SiO 4 ) and/or lithium oxide (Li 2 O).…”

“…The lithiation of SiO 2 results in the formation of nano-Si domains and inert lithium silicates (Li 4 SiO 4 ) and/or lithium oxide (Li 2 O). It is interesting that the nano-Si domains disperse uniformly in Li 4 SiO 4 / Li 2 O matrix, which prevents the nano-Si from electrochemical aggregation during cycling and buffer in a certain degree the big volume change caused by the lithiation of active Si, resulting in keeping the geometric integrity of the electrode and improving the cycling performance [12]. However, the low electronic conductivity and the strong Si-O bond of SiO 2 hinder its applications as an electrode material for LIBs.…”