Silver vanadate-lithium iron phosphate composite anode material preparation method

Abstract

The invention relates to a silver vanadate-lithium iron phosphate composite anode material preparation method. The method comprises the following steps: (1) preparing silver vanadate; (2) mixing lithium acetate and ammonium phosphate, using water to dissolve the mixture, sequentially adding citric acid and acetone, stirring to be sol, adding glucose into the sol, adding ferric hydroxide of which the molar amount is equal to the lithium molar amount and a reducing agent, namely lamp black, uniformly mixing the mixture, performing vacuum drying on the mixture, and performing ball milling on the mixture to prepare a lithium iron phosphate precursor coated by carbon; and (3) mechanically mixing the silver vanadate and the lithium iron phosphate precursor uniformly to be placed into a vacuum reaction furnace for sintering, then performing cooling, and obtaining a product after ball milling. According to the vanadate-lithium iron phosphate composite anode material for a lithium ion battery, a ferric fluoride material with high discharge capacity is subjected to cobalt doping modification to improve the conductivity of the ferric fluoride material, then is compound with a silicon doping graphene material with good conductivity and stability, so that the vanadate-lithium iron phosphate composite anode material has the characteristics of high capacity and high cycle stability.

Description

Technical field [0001] The present invention involves a preparation method for silver-sterilized-lithium iron phosphate composite positive materials. Background technique [0002] The preferred battery of electric vehicles is lithium ion battery.Because lithium -ion batteries are a new generation of green and high -energy batteries, which have many excellent characteristics such as high working voltage, high energy density, good electrochemical cycle performance, small self -discharge, no memory effect, and wide range of actual work temperature.Since the realization of commercialization of lithium -ion batteries, it has been widely used in various electric tools, mobile phones, personal computers, digital devices, electronic instruments, military portable equipment, etc.The pioneering study of Padhi in 1997 revealed the olive -shaped LIFEPO 4 The prelude of research.Lifepo 4 It has the advantages of high theoretical compared capacity (170mAh / g), a moderate voltage platform (about...

AI Technical Summary

Problems solved by technology

However, the lithium ion diffusion coefficient and conductivity of vanadium pentoxide are low, resulting in slow charge and discharge rates and poor cycle stability, which largely limits the use of vanadium pentoxide as a cathode material for lithium batteries. business applications