Local structure of the new high capacity cathode material Li4-xMn2O5 by neutron PDF analysis
We have elaborated the new nano-crystallized high capacity cathode material in the Li-Mn-O system, exhibiting record capacities larger than 430 mAh/g and good cyclabilities. Besides electrochemical characterization, we have investigated this material using chemical analysis, TEM, magnetic measurements, neutron powder diffraction at D1B, and laboratory x-ray diffraction and PDF analysis. Li ions are exchanged from a starting material of formula Li4Mn2O5. This compound can be described as a disordered MnO type cubic average structure, with Li/Mn substitutional disorder and a coherence length of about 5nm or less. The electrochemical extraction of Li leads to a Li stoichiometry below 1 and a unusually high Mn valence confirmed by magnetic measurements. The averaged structure seems to be globally preserved but x-ray PDF data are insensitive to Li which hinders an accurate description of the local structure. Therefore, we propose to measure neutron PDF data on the D4c instrument for a better characterization of the structure of the pristine and Li depleted materials, in order to understand the Li-insertion/de-insertion in this system.
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BORDET Pierre; Claire V. Colin; DIAZ LOPEZ Maria; Henry E. Fischer; FREIRE; MAIGNAN Antoine and PRALONG Valerie. (2017). Local structure of the new high capacity cathode material Li4-xMn2O5 by neutron PDF analysis. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.6-06-473
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