Abstract:

LiV3O8 cathode nanomaterials were synthesized by a hydrothermal route at different hydrothermal reaction temperature. The structure, morphology and proprieties of the samples were investigated by several tests such as XRD, TEM, cyclic voltammetry (CV), galvanostatic charge–discharge and electrochemical impedance spectroscopy (EIS) techniques. The results of XRD and TEM show that different hydrothermal temperature result in different structure and morphology of the samples, which lead to different electrochemical properties. With the increase of hydrothermal reaction temperature, the diameter of the particles accreted and size distribution forms inhomogeneous. The specific discharge capacity of the sample which synthesized at hydrothermal temperature 180℃ is highest, and has a good reversibility. In the pace of the increasing of hydrothermal temperature, the charge transfer resistance of the LiV3O8 is decrease, it is good for outset and inset of lithium-ion during the charging-discharging process. That is to say, there some defect-amorphous in the structure of materials, and there certain dimension distributing of the particles, which can improve electrochemical performances of the LiV3O8 cathode nanomaterials .

Key words: lithium-ion batteries,LiV3O8,nanomaterials,hydrothermal method