Phase Stability Study of Li[sub 1−x]MnPO[sub 4] (0≤x≤1) Cathode for Li Rechargeable Battery

The phase stability of is investigated in this study for different Li compositions and temperatures by high temperature X-ray diffraction and electron microscopy. The map of stable phases is determined at temperature ranges between room temperature and . While pure phase is stable at high temperature, partial phase transformation of into is observed in delithiated phases above . Electron microscopy study also indicates the instability of the delithiated phase. The morphology of is severely damaged upon delithiation. The instability of the delithiated phase and the phase transformation into may imply that safety concerns can be raised regarding the cathode, unlike its Fe counterpart.