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Preparation method of nitrogen-doped lithium vanadate/lithium iron phosphate composite material

A lithium iron phosphate and composite material technology, applied in electrical components, electrochemical generators, battery electrodes, etc., can solve the problems of unstable structure, low gram capacity, poor stability, etc., and achieve improved stability, high gram capacity, The effect of increasing capacity

Active Publication Date: 2021-01-12
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Lithium vanadate, as the cathode material of lithium-ion batteries, has a high gram capacity during charge and discharge, but the stability of the material is poor, and the structure is unstable during charge and discharge cycles, resulting in a rapid decline in capacity; while lithium iron phosphate is a structural Stable lithium-ion battery cathode material, suitable for long cycle charge and discharge, but relatively low gram capacity

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] (1) Dissolve 1 g of oxalic acid in 40 mL of deionized water, stir magnetically at room temperature to form a transparent aqueous oxalic acid solution, then dissolve 0.351 g of ammonium metavanadate and 0.024 g of lithium hydroxide in the aqueous solution of oxalic acid, and dissolve the obtained mixed solution Magnetically stirred at ambient temperature for 30 minutes to obtain an orange-yellow transparent solution;

[0022] (2) Transfer the orange-yellow transparent solution obtained above to an autoclave, seal the autoclave, place it at 150° C. for 12 hours, and then wait for the temperature of the autoclave to drop to ambient temperature, and take out the reaction product;

[0023] (3) After washing the reaction product obtained above three times with deionized water and absolute ethanol, place it at 80° C. for 12 hours, and then calcinate it at 450° C. for 4 hours to obtain lithium vanadate powder material;

[0024] (4) Dissolve 1 g of oxalic acid in 40 mL of deioni...

Embodiment 2

[0030] (1) Dissolve 1.6g oxalic acid in 40mL deionized water, stir magnetically at room temperature to form a transparent oxalic acid aqueous solution, then dissolve 0.702g ammonium metavanadate and 0.048g lithium hydroxide in this oxalic acid aqueous solution, and mix the obtained The solution was magnetically stirred for 30 min at ambient temperature to obtain an orange-yellow transparent solution;

[0031] (2) Transfer the orange-yellow transparent solution obtained above to an autoclave, seal the autoclave, and place it at 160° C. for 8 hours, then wait for the temperature of the autoclave to drop to ambient temperature, and take out the reaction product;

[0032] (3) Washing the reaction product obtained above three times with deionized water and absolute ethanol, drying at 80°C for 12h, and then calcining at 500°C for 5h to obtain lithium vanadate powder material;

[0033] (4) Dissolve 1.6g oxalic acid in 40mL deionized water, stir at room temperature to form a transpare...

Embodiment 3

[0039] (1) Dissolve 1.2g oxalic acid in 40mL deionized water, stir magnetically at room temperature to form a transparent oxalic acid aqueous solution, then dissolve 0.351g ammonium metavanadate and 0.024g lithium hydroxide in this oxalic acid aqueous solution, and mix the obtained The solution was magnetically stirred for 30 min at ambient temperature to obtain an orange-yellow transparent solution;

[0040] (2) Transfer the orange-yellow transparent solution obtained above to an autoclave, seal the autoclave, and place it at 140° C. for 12 hours, then wait for the temperature of the autoclave to drop to ambient temperature, and take out the reaction product;

[0041] (3) Washing the above-mentioned reaction product with deionized water and absolute ethanol three times, drying at 80°C for 12 hours, and then calcining at 400°C for 6 hours to obtain lithium vanadate powder material;

[0042] (4) Dissolve 1.2g oxalic acid in 40mL deionized water, stir at room temperature to form...

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Abstract

The invention discloses a preparation method of a nitrogen-doped lithium vanadate / lithium iron phosphate composite material, and relates to the technical field of lithium ion battery cathode materials, and the preparation method comprises the following steps: dissolving oxalic acid, ammonium metavanadate and a lithium source in deionized water, stirring, transferring into a reaction kettle for hydrothermal reaction, taking out a reaction product after the reaction is finished, washing, drying and calcining to obtain a precursor a; dissolving oxalic acid, a phosphorus source, an iron source anda lithium source in deionized water, stirred and transferred into a reaction kettle for a hydrothermal reaction, taking out a reaction product, washing and drying, and obtaining a precursor b; and adding the precursor a and the precursor b into a pyrrole aqueous solution, grinding into slurry, freeze-drying, and calcining in an inert protective atmosphere to obtain the composite material. The lithium vanadate and the lithium iron phosphate are compounded together through blending, the stability of the composite material is improved through nitrogen doping, and the obtained material is used for the positive electrode of the lithium ion battery and is high in gram volume and good in cycle performance.

Description

technical field [0001] The invention relates to the technical field of positive electrode materials for lithium ion batteries, in particular to a preparation method of a nitrogen-doped lithium vanadate / lithium iron phosphate composite material. Background technique [0002] Lithium-ion batteries are clean and efficient energy storage devices that have been widely used in various portable electronic products, communication tools and electric vehicles in recent years. Compared with traditional secondary batteries, lithium-ion batteries have outstanding advantages, such as high energy density, high voltage platform, and good cycle stability. Lithium-ion batteries are mainly composed of positive electrode active materials, negative electrode active materials, separators, and electrolyte materials. Among them, positive electrode active materials are one of the most important components of lithium-ion batteries and are the key factors for the development of high-performance lithiu...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/485H01M4/58H01M10/0525
CPCH01M4/364H01M4/485H01M4/5825H01M10/0525Y02E60/10
Inventor 石波朱文婷高明昊李道聪丁楚雄
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY
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