The invention discloses a carbon-decorated porous
lithium vanadium phosphate nanosphere material as well as a preparation method and application thereof.
Lithium vanadium phosphate particles coated with a
carbon layer are connected with one another to form the carbon-decorated porous
lithium vanadium phosphate nanosphere material which is characterized in that
lithium vanadium phosphate particles are connected with one another by a three-dimensional carbon net, and the three-dimensional carbon net covers lithium
vanadium phosphate. The preparation method comprises the following steps: adding a vanadium source, namely vanadium
pentoxide, and
oxalic acid into
distilled water, and agitating until vanadium
pentoxide and
oxalic acid are dissolved; sequentially adding a
phosphorus source, a lithium source, glycol and
ethylenediamine; carrying out
hydrothermal reaction on the materials to obtain a precursor solution;
drying the precursor solution to obtain a red brown
solid; and
grinding, pre-
sintering,
grinding and calcining the
solid to finally obtain the black three-dimensional carbon-decorated porous lithium
vanadium phosphate nanosphere material. When being used as a positive active material of a
lithium ion battery, the carbon-decorated porous lithium vanadium phosphate nanosphere material has the characteristics of high power and high
cycling stability; the preparation process is simple, and the nanosphere material can be obtained by combining a hydrothermal method with a
solid-state
sintering method; the nanosphere material is high in feasibility and easy to amplify, meets the requirements of
green chemistry, and is suitable for market popularization.