Molybdenum-Doped Titanium Dioxide and Its Superior Lithium Storage Performance

Molybdenum-doped titanium dioxide obtained using a facile hydrothermal process delivers a high reversible capacity of 408 mA h g(-1) at 60 mA g(-1) after 200 cycles, which is more than twice of that of undoped TiO2. In addition, this material also exhibits a better rate capability. Structural and surface analyses indicate that doping with Mo6+ has significant effects on the transformation of brookite to anatase and on the electronic structure, thereby improving the electrical conductivity. Remarkably, Mo6+ doping also induces a substantial decrease in particle size and lattice distortion, which greatly ameliorates the lithium diffusion and enhances the interfacial lithium storage. In combination with the extra lithium storage capacity through the conversion reaction of Mo6+ with Li+, the electrochemical performance of molybdenum-doped titanium dioxide dramatically improves.