Abstract
Different solid state and sol–gel preparations of undoped and Mn substituted cathode material LiFePO 4 are investigated. Li 3PO 4, Fe 2P 2O 7 and Li 4P 2O 7 are detected and quantified by XRPD only in solid state synthesis. In addition, micro-Raman spectra reveal low amount of different iron oxides clusters. EPR data, combined with the results of magnetization measurements, evidence signals from Fe 3+ ions in maghemite nanoclusters, and in Li 3Fe 2(PO 4) 3. The sol–gel synthesis, showing the lowest amount of impurity phases, seems the most suitable to obtain a promising cathode material. The structural refinement gives new insights into the cation distribution of the Mn doped triphylite structure: (i) about 85% of Mn 2+ ions substitutes Fe 2+, the remaining 15% being located on the Li site, thus suggesting a structural disorder also confirmed by EPR and micro-Raman results; (ii) Mn ions on the Li site are responsible for the observed slight cell volume expansion.
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