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Title: Toward understanding the lithiation/delithiation process in Fe 0.5TiOPO 4/C electrode material for lithium-ion batteries

We used Fe 0.5TiOPO 4/C composite as anode material for LIB and exhibits excellent cycling performance when the electrode is cycled in two different voltage ranges [3.0-1.3V] and [3.0- 0.02V] where different insertion mechanisms were involved. Based on in situ X-ray diffraction, in situ XANES spectroscopy results, and various electrochemical analyses at high and low voltage cut-off, we found that Fe 0.5TiOPO 4/C electrode materials still maintains its structure crystallinity after cycling between [3.0-1.3V] showing formation of new phase at the end of first discharge, with a reversible capacity of 100 mAhg-1 after 50 cycles at C/5 rate. Moreover, at highly lithiated states, [3.0-0.02V] voltage range, a reduction decomposition reaction highlights the Li-insertion/extraction behaviors, and low phase crystallinity is observed during cycling, in addition an excellent rate behavior and a reversible capacity of 250 mAhg - 1 can still be maintained after 50 cycles at high cycling rate 5C.
 [1] ;  [2] ;  [3] ;  [4] ;  [4] ;  [4] ;  [5] ;  [6]
  1. Cadi Ayyad Univ., Marrakech (Morrocco)
  2. Julich Research Centre (Germany)
  3. Cadi Ayyad Univ., Marrakech (Morrocco); Mohammad VI Polytechnical Univ., Ben Guerir (Morrocco)
  4. Univ. of Montpellier (France); Research Center on Batteries and Supercapacitors, Amiens Cedex (France)
  5. Julich Research Centre (Germany); Univ. of Liege, (Belgium). Faculty of Sciences; Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  6. Karlsruhe Inst. of Technology (KIT) (Germany)
Publication Date:
Grant/Contract Number:
Accepted Manuscript
Journal Name:
Solar Energy Materials and Solar Cells
Additional Journal Information:
Journal Volume: 148; Journal Issue: C; Journal ID: ISSN 0927-0248
Research Org:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Country of Publication:
United States
25 ENERGY STORAGE; Lithium-ion batteries; Anode material; Fe0.5TiOPO4; Reaction mechanism; In situ XRD; In situ XANES
OSTI Identifier:
Alternate Identifier(s):
OSTI ID: 1254046