HYDROTHERMAL SYNTHESIS OF LITHIUM VANADIUM OXIDE NANORODS AS CATHODE MATERIALS FOR RECHARGEABLE LITHIUM BATTERIES

摘要

The preparation of lithium vanadium oxides including LiV_3O_8 and γ-LiV_2O_5 has been studied in this paper. LiV_3O_8 nanorods with diameters of about 40 nm have been obtained by a novel hydrothermal-based two-step method. A specific capacity of 302 mAh/g was obtained in the range of 1.8 - 40 V in the second cycle and 282 mAh/g in the 20th cycle. Meanwhile, γ-LiV_2O_5 nanorods with diameters of 30-40 nm have been prepared by a simple solvothermal method using ethanol as a solvent, which also serves as a reducing agent. The γ-LiV_2O_5/Li cell demonstrated an initial specific capacity of 259 mAh/g. After several initial cycling, the cell showed stabilized cycling behavior (199 mAh/g at the 20th cycle). It indicates that the lithium vanadium oxide nanorods prepared by the above methods have potentiality to be used as cathode material in rechargeable lithium batteries.