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Fluorination of MXene by Elemental F 2 as Electrode Material for Lithium‐Ion Batteries
Author(s) -
Thapaliya Bishnu P.,
Jafta Charl J.,
Lyu Hailong,
Xia Jiexiang,
Meyer Harry M.,
Paranthaman M. Parans,
Sun XiaoGuang,
Bridges Craig A.,
Dai Sheng
Publication year - 2019
Publication title -
chemsuschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.412
H-Index - 157
eISSN - 1864-564X
pISSN - 1864-5631
DOI - 10.1002/cssc.201900003
Subject(s) - x ray photoelectron spectroscopy , lithium (medication) , electrochemistry , materials science , fluorine , phase (matter) , ion , electrode , impurity , chemical engineering , inorganic chemistry , chemistry , metallurgy , organic chemistry , medicine , engineering , endocrinology
The transformation of MXene sheets into TiOF 2 2D sheets with superior electrochemical performance was developed. MXene synthesized from Ti 3 AlC 2 was fluorinated for 3, 6, and 24 h, respectively, by means of a direct fluorination process. Exposure of MXene powder to elemental fluorine for 3 h induced the formation of CF 2 groups and TiF 3 on the surface, which have beneficial effects on the electrochemical performance. X‐ray photoelectron spectroscopy suggested that after fluorinating the MXene sample for 6 h Ti 2+ and Ti 3+ were not present on the surface but only Ti 4+ , indicating the formation of TiOF 2 . XRD indicated that TiOF 2 was present after fluorinating for 3 h, and after 24 h the MXene had transformed to TiOF 2 with minor impurities remaining, maintaining its 2D layer morphology. The 24 h fluorinated sample with its TiOF 2 phase showed superior capacity that increased with cycle number. It also had a better rate capability than non‐2D‐layered TiOF 2 , indicating the advantage of the 2D‐layered morphology derived from the parent MXene phase.