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Title: Fluorination of MXene by Elemental F2 as Electrode Material for Lithium-Ion Batteries

Abstract

The transformation of MXene sheets into TiOF2 2D sheets with superior electrochemical performance was developed. MXene synthesized from Ti3AlC2 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 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 6 h Ti2+ and Ti3+ were not present on the surface but only Ti4+, implying the formation of TiOF2. XRD indicated that TiOF2 was present after fluorinating for 3 h, and after 24 h the MXene had transformed to TiOF2 with minor impurities remaining, maintaining its 2D layer morphology. The 24 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, suggesting the advantage of the 2D-layered morphology derived from the parent MXene phase.

Authors:
ORCiD logo [1]; ORCiD logo [2]; ORCiD logo [2]; ORCiD logo [2]; ORCiD logo [2]; ORCiD logo [2]; ORCiD logo [2]; ORCiD logo [2]; ORCiD logo [3]
  1. Univ. of Tennessee, Knoxville, TN (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  3. Univ. of Tennessee, Knoxville, TN (United States)
Publication Date:
Research Org.:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division
OSTI Identifier:
1524867
Grant/Contract Number:  
AC05-00OR22725
Resource Type:
Accepted Manuscript
Journal Name:
ChemSusChem
Additional Journal Information:
Journal Volume: 12; Journal Issue: 7; Journal ID: ISSN 1864-5631
Publisher:
ChemPubSoc Europe
Country of Publication:
United States
Language:
English
Subject:
25 ENERGY STORAGE; batteries; fluorination; lithium-ion; MXene; TiOF2

Citation Formats

Prasad Thapaliya, Bishnu, Jafta, Charl J., Lyu, Hailong, Xia, Jiexiang, Meyer, Harry M., Paranthaman, M. Parans, Sun, Xiao‐Guang, Bridges, Craig A., and Dai, Sheng. Fluorination of MXene by Elemental F2 as Electrode Material for Lithium-Ion Batteries. United States: N. p., 2019. Web. doi:10.1002/cssc.201900003.
Prasad Thapaliya, Bishnu, Jafta, Charl J., Lyu, Hailong, Xia, Jiexiang, Meyer, Harry M., Paranthaman, M. Parans, Sun, Xiao‐Guang, Bridges, Craig A., & Dai, Sheng. Fluorination of MXene by Elemental F2 as Electrode Material for Lithium-Ion Batteries. United States. https://doi.org/10.1002/cssc.201900003
Prasad Thapaliya, Bishnu, Jafta, Charl J., Lyu, Hailong, Xia, Jiexiang, Meyer, Harry M., Paranthaman, M. Parans, Sun, Xiao‐Guang, Bridges, Craig A., and Dai, Sheng. Wed . "Fluorination of MXene by Elemental F2 as Electrode Material for Lithium-Ion Batteries". United States. https://doi.org/10.1002/cssc.201900003. https://www.osti.gov/servlets/purl/1524867.
@article{osti_1524867,
title = {Fluorination of MXene by Elemental F2 as Electrode Material for Lithium-Ion Batteries},
author = {Prasad Thapaliya, Bishnu and Jafta, Charl J. and Lyu, Hailong and Xia, Jiexiang and Meyer, Harry M. and Paranthaman, M. Parans and Sun, Xiao‐Guang and Bridges, Craig A. and Dai, Sheng},
abstractNote = {The transformation of MXene sheets into TiOF2 2D sheets with superior electrochemical performance was developed. MXene synthesized from Ti3AlC2 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 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 6 h Ti2+ and Ti3+ were not present on the surface but only Ti4+, implying the formation of TiOF2. XRD indicated that TiOF2 was present after fluorinating for 3 h, and after 24 h the MXene had transformed to TiOF2 with minor impurities remaining, maintaining its 2D layer morphology. The 24 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, suggesting the advantage of the 2D-layered morphology derived from the parent MXene phase.},
doi = {10.1002/cssc.201900003},
journal = {ChemSusChem},
number = 7,
volume = 12,
place = {United States},
year = {Wed Feb 13 00:00:00 EST 2019},
month = {Wed Feb 13 00:00:00 EST 2019}
}

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