Abstract
Olivine structured LiFe 1/4Mn 1/4Co 1/4Ni 1/4PO 4 in pure solid solution single phase was obtained using solid-state reaction. For the carbon-coated material, in a voltage range of 3.0–5.1 V (vs. Li/Li +), three voltage plateaus were observed clearly in both galvanostatic discharging and galvanostatic intermittent titration technique (GITT) curves. These three plateaus are corresponding to Co 3+/Co 2+, Mn 3+/Mn 2+ and Fe 3+/Fe 2+ redox couples. No definite plateau can be assigned to Ni 3+/Ni 2+ redox couple in this voltage range. The overpotentials show the maximum when the redox reaction shifts from one redox couple to another couple. The apparent chemical diffusion coefficients of lithium ( D ˜ Li ) are in the same order of magnitude 10 −15 cm 2 s −1 for all transition reactions.
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