Enhanced Electrochemical Properties of Li2NiTiO4 Cathode with Mo-Doping

Li2NiTiO4 is a kind of layered cathode materials with rock-salt structure for lithium ion battery which can extract 2 lithium ions per formula. The material has larger charged capacity, but the reversible discharge capacity is limited. Molybdenum was doped into Li2NiTiO4 cell by a citric acid sol-gel method using LiNO3, Ni(NO3)(2)center dot 6H(2)O, and Tetrabutyl titanate as starting materials, Mo7O24 (NH4)(6)center dot 4H(2)O as a molybdenum source. The structure, micro morphology and elements' valences were characterized by XRD, SEM and XPS. The electrochemical properties were tested with charge-discharge cycle, CV and EIS. After Mo-doping, the electrochemical properties are enhanced: the reversible specific capacity is increased from 85 mAh/g to 162 mAh/g. What's more, when the Mo doped Li2NiTiO4 is composited with carbon, the conductivities are improved and the reversible specific capacity further increases to 210 mAh/g.