Method for preparing vanadium pentoxide cathode nano-material of lithium-ion battery

A method for preparing a vanadium pentoxide cathode nano-material of a lithium-ion battery comprises the following steps of: adding vanadium oxide to hydrogen peroxide solution with the mass fraction of 5-15%, stirring until vanadium oxide is completely dissolved to generate red peroxy-vanadic acid (HVO4) solution, continuing stirring at the room temperature for 1-6 h, and then heating the mixed solution until the temperature reaches 40-90 DEG C, and drying to form gel; and sintering the gel in air by increasing the temperature to 250-500 DEG C, thereby obtaining the vanadium pentoxide nano-material, wherein the quantity of addition of vanadium oxide is determined as 0.01-0.05 g per one milliliter according to the volume of the hydrogen peroxide solution. The process method provided by the invention is simple and convenient to operate; the prepared vanadium pentoxide cathode nano-material is good in cycle performance and long in service life; and the preparation method is simple in equipment required, moderate in reaction condition, short in time taken, friendly to environment, and low in production cost, thereby being suitable for large-scale industrial production.