Silver vanadate-lithium iron phosphate composite anode material preparation method

A composite cathode material, lithium iron phosphate technology, applied in battery electrodes, electrical components, circuits, etc., can solve the problems of poor cycle stability, limited commercial applications, slow charge and discharge rates, etc., to achieve high cycle stability, high capacity, The effect of long service life

Active Publication Date: 2013-07-03
广东比沃新能源有限公司
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  • Summary
  • Abstract
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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

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Dissolve potassium metavanadate into hydrogen peroxide with a mass fraction of 15%, the molar ratio of potassium metavanadate to hydrogen peroxide is 20-30, add deionized water to dilute to obtain transparent peroxovanadic acid with a molar concentration of 0.02mol / L Solution, silver oxalate is dispersed in deionized water to form a dopant with a molar concentration of 0.005mol / L, the molar ratio range of the silver oxalate and potassium metavanadate is 0.1:1, and the silver oxalate mixture is poured into the mixed with vanadyl acid solution and fully stirred, and then poured into a hydrothermal reaction kettle for hydrothermal reaction at 150° C. for 20 hours to obtain silver vanadate.

[0015] Lithium acetate and ammonium phosphate are mixed according to the ratio of Li:P molar ratio of 1:1, dissolved in water, citric acid with 0.1-0.2 times the molar weight of lithium and acetone with 0.2 times the molar weight of lithium are added successively, at 50°C Stir, make s...

Embodiment 2

[0018] Dissolving potassium metavanadate into hydrogen peroxide with a mass fraction of 20%, the molar ratio of potassium metavanadate to hydrogen peroxide is 20-30, adding deionized water to dilute to obtain transparent peroxovanadic acid with a molar concentration of 0.04mol / L solution, silver oxalate is dispersed in deionized water to form a dopant with a molar concentration of 0.015mol / L, the molar ratio range of the silver oxalate and potassium metavanadate is 0.15:1, and the silver oxalate mixture is poured into the mixed with vanadyl acid solution and fully stirred, then poured into a hydrothermal reaction kettle for hydrothermal reaction at 180°C for 10 hours to obtain silver vanadate.

[0019] Lithium acetate and ammonium phosphate are mixed according to the ratio of Li:P molar ratio of 1:1, dissolved in water, citric acid with 0.1-0.2 times the molar weight of lithium and acetone with 0.3 times the molar weight of lithium are added successively, at 65°C Stir, make s...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/48H01M4/58
CPCY02E60/10
Inventor 严建泗
Owner 广东比沃新能源有限公司
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