Mechanism of the Delithiation/Lithiation Process in LiFe0.4Mn0.6PO4: in Situ and ex Situ Investigations on Long-Range and Local Structures
Journal Article
·
· Journal of Physical Chemistry. C
- Cadi Ayyad Univ., Marrakesh (Morocco); Karlsruhe Inst. of Technology (KIT) (Germany)
- Karlsruhe Inst. of Technology (KIT) (Germany)
- Bruker Biospin GmbH (Germany)
- Karlsruhe Inst. of Technology (KIT) (Germany); Helmholtz Institute Ulm for Electrochemical Energy Storage (HIU) (Germany); Technical Univ. of Darmstadt (Germany)
- Karlsruhe Inst. of Technology (KIT) (Germany); Helmholtz Institute Ulm for Electrochemical Energy Storage (HIU) (Germany)
- Univ. of Cambridge (United Kingdom)
- Cadi Ayyad Univ., Marrakesh (Morocco)
LiFe0.4Mn0.6PO4 olivine was prepared by a sol–gel route, using citric acid as a chelating agent and NH4H2PO4 as a phosphorus source. Sucrose was used as the source for the carbon-coating of the particles. The correlation between the physicochemical and the electrochemical properties of this positive electrode material was explored. The electrochemical tests showed an initial discharge capacity of 121 mAh/g at a C/20 rate with a good reversibility of the lithiation/delithiation reactions. In situ XRD on LiFe0.4Mn0.6PO4 reveals the occurrence of new phases upon cycling, which disappeared again at the end of discharge. The single phase observed after one complete cycle is identical to the pristine one. In situ XAS spectroscopy in combination with 57Fe Mössbauer and 7Li NMR spectroscopy were used to investigate the changes in the local structure and the oxidation states of the transition metals and thus to complete the overall characterization of the lithiation/delithiation mechanism. All findings reveal a high reversibility of the reactions in this electrode material.
- Research Organization:
- Energy Frontier Research Centers (EFRC) (United States). Northeastern Center for Chemical Energy Storage (NECCES)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
- Grant/Contract Number:
- SC0001294; SC0012583
- OSTI ID:
- 1385987
- Journal Information:
- Journal of Physical Chemistry. C, Journal Name: Journal of Physical Chemistry. C Journal Issue: 17 Vol. 119; ISSN 1932-7447
- Publisher:
- American Chemical SocietyCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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