Phase relations of Li2O-FeO-B2O3 ternary system and electrochemical properties of LiFeBO3 compound

Phase equilibria in the ternary Li2O-FeO-B2O3 system were studied by means of X-ray powder diffraction. The Li2O-FeO-B2O3 system can be characterized by the existence of 17 three-phase regions. For the two ternary compounds found in this system, the compound A with molar ratio of Li2O, FeO and B2O3 in 2:1:1 had not been reported previously. The nearly unchanged d values for the X-ray diffraction peaks of the samples around the new compounds A indicate the existence of the new compound A in the ternary Li2O-FeO-B2O3 system. Other new information includes the electrochemical properties of LiFeBO3 compound, where the electrochemical test indicated that the discharge plateau potential of LiFeBO3 compound is around 2.3 V and initial discharge-specific capacities can reach to 91.8 mA h g-1. Our results show that LiFeBO3 samples have better capacity retention except for the first two cycles