Abstract
The remarkable thermal stability of LiFePO 4 and its charged counterpart, FePO 4, have been instrumental in its commercialization as a lithium-ion battery cathode material. Despite the similarity in composition and structure, and despite the high thermal stability of the parent compound, LiMnPO 4, we find that the delithiated phase Li y MnPO 4 (which contains a small amount of residual lithium), is relatively unstable and reactive toward a lithium-ion electrolyte. The onset temperature for heat evolution in the presence of 1 M LiPF 6 in 1:1 ethylene carbonate/propylene carbonate is around 150 °C, and the total evolved heat is 884 J g −1, comparable to that produced under similar conditions by charged LiCoO 2 electrodes.
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