Fluorination of MXene by Elemental F2 as Electrode Material for Lithium-Ion Batteries.
ChemSusChem
; 12(7): 1316-1324, 2019 Apr 05.
Article
em En
| MEDLINE
| ID: mdl-30759316
ABSTRACT
The transformation of MXene sheets into TiOF2 2D sheets with superior electrochemical performance was developed. MXene synthesized from Ti3 AlC2 was fluorinated for 3, 6, and 24â
h, respectively, by means of a direct fluorination process. Exposure of MXene powder to elemental fluorine for 3â
h induced the formation of CF2 groups and TiF3 on the surface, which have beneficial effects on the electrochemical performance. X-ray photoelectron spectroscopy suggested that after fluorinating the MXene sample for 6â
h Ti2+ and Ti3+ were not present on the surface but only Ti4+ , indicating the formation of TiOF2 . XRD indicated that TiOF2 was present after fluorinating for 3â
h, and after 24â
h the MXene had transformed to TiOF2 with minor impurities remaining, maintaining its 2D layer morphology. The 24â
h fluorinated sample with its TiOF2 phase showed superior capacity that increased with cycle number. It also had a better rate capability than non-2D-layered TiOF2 , indicating the advantage of the 2D-layered morphology derived from the parent MXene phase.
Texto completo:
1
Base de dados:
MEDLINE
Idioma:
En
Revista:
ChemSusChem
Assunto da revista:
QUIMICA
/
TOXICOLOGIA
Ano de publicação:
2019
Tipo de documento:
Article
País de afiliação:
Estados Unidos