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Fluorination of MXene by Elemental F2 as Electrode Material for Lithium‐Ion Batteries
ChemSusChem ( IF 7.5 ) Pub Date : 2019-03-21 , DOI: 10.1002/cssc.201900003 Bishnu P. Thapaliya 1 , Charl J. Jafta 2 , Hailong Lyu 2 , Jiexiang Xia 2 , Harry M. Meyer 3 , M. Parans Paranthaman 2 , Xiao‐Guang Sun 2 , Craig A. Bridges 2 , Sheng Dai 1, 2
ChemSusChem ( IF 7.5 ) Pub Date : 2019-03-21 , DOI: 10.1002/cssc.201900003 Bishnu P. Thapaliya 1 , Charl J. Jafta 2 , Hailong Lyu 2 , Jiexiang Xia 2 , Harry M. Meyer 3 , M. Parans Paranthaman 2 , Xiao‐Guang Sun 2 , Craig A. Bridges 2 , Sheng Dai 1, 2
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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+, indicating 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, indicating the advantage of the 2D‐layered morphology derived from the parent MXene phase.
中文翻译：
元素F2作为锂离子电池电极材料对MXene的氟化
开发了将MXene片转变为具有优异电化学性能的TiOF 2 2D片。由Ti 3 AlC 2合成的MXene分别通过直接氟化工艺进行了3、6和24 h的氟化。将MXene粉暴露于元素氟3 h会在表面上形成CF 2基团和TiF 3，这对电化学性能具有有益的影响。X射线光电子能谱表明，将MXene样品氟化6小时后，表面上不存在Ti 2+和Ti 3+，仅存在Ti 4+，表明形成了TiOF 2。。XRD表明，氟化3小时后存在TiOF 2，并且24小时后，MXene已转化为TiOF 2，残留有少量杂质，保持了其2D层的形态。具有TiOF 2相的24小时氟化样品显示出优异的容量，并随循环次数增加而增加。它也比非2D层的TiOF 2具有更好的速率能力，表明从母体MXene相衍生的2D层形态的优势。
更新日期：2019-03-21
中文翻译：
元素F2作为锂离子电池电极材料对MXene的氟化
开发了将MXene片转变为具有优异电化学性能的TiOF 2 2D片。由Ti 3 AlC 2合成的MXene分别通过直接氟化工艺进行了3、6和24 h的氟化。将MXene粉暴露于元素氟3 h会在表面上形成CF 2基团和TiF 3，这对电化学性能具有有益的影响。X射线光电子能谱表明，将MXene样品氟化6小时后，表面上不存在Ti 2+和Ti 3+，仅存在Ti 4+，表明形成了TiOF 2。。XRD表明，氟化3小时后存在TiOF 2，并且24小时后，MXene已转化为TiOF 2，残留有少量杂质，保持了其2D层的形态。具有TiOF 2相的24小时氟化样品显示出优异的容量，并随循环次数增加而增加。它也比非2D层的TiOF 2具有更好的速率能力，表明从母体MXene相衍生的2D层形态的优势。
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