Toward understanding the lithiation/delithiation process in Fe_0.5TiOPO₄/C electrode material for lithium-ion batteries

Journal Article · Sat Nov 28 00:00:00 EST 2015 · Solar Energy Materials and Solar Cells

DOI:https://doi.org/10.1016/j.solmat.2015.11.021· OSTI ID:1261325

Lasri, Karima ^[1]; Mahmoud, Abdelfattah ^[2]; Saadoune, Ismael ^[3]; Sougrati, Moulay Tahar ^[4]; Stievano, Lorenzo ^[4]; Lippens, Pierre-Emmanuel ^[4]; Hermann, Raphaël Pierre ^[5]; Ehrenberg, Helmut ^[6]

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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)

We used Fe_0.5TiOPO₄/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_0.5TiOPO₄/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.

• Research Organization: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
• Sponsoring Organization: USDOE Office of Science (SC), Basic Energy Sciences (BES)
• Grant/Contract Number: AC05-00OR22725
• OSTI ID: 1261325
• Alternate ID(s): OSTI ID: 1254046
• Journal Information: Solar Energy Materials and Solar Cells, Vol. 148, Issue C; ISSN 0927-0248
• Publisher: Elsevier
• Country of Publication: United States
• Language: English

Related Subjects

25 ENERGY STORAGE
Lithium-ion batteries
Anode material
Fe0.5TiOPO4
Reaction mechanism
In situ XRD
In situ XANES