Silica aerogel (SiO2ag) was combined with carbonaceous material in the pyrolysis process of hydrocarbons. The obtained nanocomposite SiO2ag/C was amorphous, partially preserving the porous structure of SiO2ag. The specific surface area changes from 445.6 m2/g for pure SiO2ag to 205.52 m2/g SiO2ag/C. The 29Si MAS-NMR shows a three-dimensional matrix with silicon atoms connected to other silicon atoms by four and three oxygen bridges. The Raman spectrum reveals the state of carbonaceous material, with typical D and G peaks, derived from hydrocarbon pyrolysis. SiO2ag/C was tested as an electrode in contact with LiPF6 in the EC/DMC electrolyte. Electrochemical measurements showed the presence of complex redox couple activities of SiO2ag/C. XPS was employed to identify products obtained under polarization of SiO2ag/C. Silica reduction proceeds with Li2O, Li2Si2O3, Li2Si2O5,Li4SiO4 and LixSi formation. The charge capacity after 30 cycles is equal to 550 mAh/g.
Authors
Additional information
- Category
- Publikacja w czasopiśmie
- Type
- artykuł w czasopiśmie wyróżnionym w JCR
- Language
- angielski
- Publication year
- 2016
