Preparation and Characterization of Nanomaterial Consisting of Silica Aerogel & Carbon Tested as an Electrode in Non-Aqueous Media Containing Lithium Salt.
PBN-AR
Instytucja
Wydział Chemiczny (Politechnika Gdańska)
Informacje podstawowe
Główny język publikacji
ENG
Czasopismo
International Journal of Electrochemical Science
ISSN
1452-3981
EISSN
Wydawca
DOI
URL
Rok publikacji
2016
Numer zeszytu
3
Strony od-do
1997-2017
Numer tomu
11
Identyfikator DOI
Liczba arkuszy
Słowa kluczowe
ANODE MATERIAL
LITHIUM-ION BATTERIES
SILICA AEROGEL
SIO2@C
Streszczenia
Język
Treść
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.
Inne
System-identifier
139213