Phase relations of Li2O-MnO-P2O5 system and the electrochemical properties of Li1+xMn1−xPO4 compounds

The phase relations of Li2O-MnO-P2O5 ternary system under reducing atmosphere have been systematically investigated by means of X-ray diffraction for the first time. A high-pressure phase Mn3(PO4)2 can be easily obtained in the MnO-P2O5 system and its detail structure is presented. In addition, the solid solubility of Li1+xMn1−xPO4 is determined as −0.05 ⩽ x ⩽ 0.03, and electrochemical properties of Li1+xMn1−xPO4 are investigated.