Method for synthesizing FeF3/CNTs positive electrode material by liquid phase method

A positive electrode material and liquid phase method technology, which is applied in the field of FeF3/CNTs positive electrode material synthesis by liquid phase method, can solve the problems of insufficient electrochemical performance, poor electrochemical performance, wide energy band gap, etc., and achieve particle size Small size, good electrical conductivity, and high charge-discharge specific capacity

Inactive Publication Date: 2018-07-10
KUNMING UNIV OF SCI & TECH
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  • Description
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Problems solved by technology

But FeF 3 The characteristic of ionic bond is strong, and the energy band gap is wide, resulting in poor conductivity, which is an electronic insulator, so that the electrochemical performance of the material is poor. If it is directly used as a lithium battery cathode material, its electrochemical performance will not be fully developed. , it must be modified to improve its electrochemical performance

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  • Method for synthesizing FeF3/CNTs positive electrode material by liquid phase method
  • Method for synthesizing FeF3/CNTs positive electrode material by liquid phase method
  • Method for synthesizing FeF3/CNTs positive electrode material by liquid phase method

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Embodiment 1

[0025] A liquid-phase method for synthesizing FeF 3 / CNTs positive electrode material method, the specific steps are:

[0026] (1) Disperse 1.5g of carbon nanotubes in 25mL of nitric acid with a mass fraction of 68% and 25mL of sulfuric acid with a mass fraction of 98% according to the ratio of mass volume ratio g:mL of 3:100, Magnetically stirred at room temperature for 3 h to obtain a mixed solution A;

[0027] (2) Measure hydrofluoric acid equal to the volume of mixed solution A with a mass fraction of 30%, slowly add it to mixed solution A, stir until fully dispersed, and obtain mixed solution B;

[0028] (3) Weigh iron acetylacetonate according to the mass volume ratio g:mL of iron acetylacetonate and ethanol aqueous solution g:mL is 30:100, add 60g iron acetylacetonate and 3g surfactant polyethylene glycol (PEG) to 200mL In the ethanol aqueous solution, the ethanol aqueous solution is obtained by mixing equal volumes of ethanol and water, and is prepared as a mixed sol...

Embodiment 2

[0037] A liquid-phase method for synthesizing FeF 3 / CNTs positive electrode material method, the specific steps are:

[0038] (1) Disperse 3.2g of carbon nanotubes in a mixed acid of 60mL of nitric acid with a mass fraction of 68% and 20mL of sulfuric acid with a mass fraction of 98% according to the mass volume ratio g:mL of 4:100, Magnetically stirred at room temperature for 4 h to obtain a mixed solution A;

[0039] (2) Measure hydrofluoric acid equal to the volume of mixed solution A with a mass fraction of 30%, slowly add it to mixed solution A, stir until fully dispersed, and obtain mixed solution B;

[0040] (3) Weigh iron acetylacetonate according to the mass volume ratio g:mL of iron acetylacetonate and ethanol aqueous solution g:mL is 10:100, add 48g iron acetylacetonate and 3.36g surfactant fatty acid polyoxyethylene ester (AE) to In the 480mL ethanol aqueous solution, the ethanol aqueous solution is obtained by mixing equal volumes of ethanol and water, and is pre...

Embodiment 3

[0045] A liquid-phase method for synthesizing FeF 3 / CNTs positive electrode material method, the specific steps are:

[0046] (1) Disperse 3g of carbon nanotubes in a mixture of 40mL of nitric acid with a mass fraction of 68% and 20mL of sulfuric acid with a mass fraction of 98% according to the mass volume ratio g:mL of 5:100. Stir magnetically at room temperature for 6 h to obtain a mixed solution A;

[0047] (2) Measure hydrofluoric acid equal to the volume of mixed solution A with a mass fraction of 30%, slowly add it to mixed solution A, stir until fully dispersed, and obtain mixed solution B;

[0048] (3) According to the mass volume ratio of iron acetylacetonate and ethanol aqueous solution g:mL is 20:100, iron acetylacetonate is weighed, and 72g iron acetylacetonate and 4.32g surfactant alkylphenol polyoxyethylene ether (APEO) Add it into 360mL ethanol aqueous solution, which is obtained by mixing equal volumes of ethanol and water, and prepare mixed solution C;

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Abstract

The invention discloses a method for synthesizing a FeF3/CNTs positive electrode material by a liquid phase method and belongs to the technical field of lithium ion batteries. The method comprises dispersing carbon nanotubes in a mixed solution of nitric acid and sulfuric acid through magnetic stirring to obtain a mixed solution A, adding hydrofluoric acid into the mixed solution A to obtain a mixed solution B, dissolving a surfactant and ferric acetylacetonate in an aqueous solution of ethanol to obtain a mixed solution C, adding the mixed solution C into the mixed solution B drop by drop, carrying out magnetic stirring for a reaction, after dropwise addition, carrying out stirring for 15-24h, filtering and washing the reaction product, carrying out drying through a vacuum drying oven, and carrying out calcination in an inert atmosphere at a temperature of 300 to 500 DEG C to obtain the FeF3/CNTs positive electrode material. The FeF3/CNTs positive electrode material has the characteristics of small particle size, good particle dispersibility and good electrical conductivity, can be used for preparation of a lithium ion battery, and has a high charge-discharge ratio capacity, goodcirculation stability and high rate performance.

Description

technical field [0001] The invention relates to a liquid phase method for synthesizing FeF 3 The invention discloses a method for CNTs cathode material, which belongs to the technical field of lithium ion batteries. Background technique [0002] With the continuous development of modern industry and the continuous improvement of human living standards, human beings are also facing the depletion of traditional fossil energy and environmental pollution while enjoying the convenience brought by industrial development. In order to protect the natural resources that human beings rely on, researchers from all over the world are trying to find and develop new energy materials with environmental protection, high energy and high safety. After continuous research and exploration by human beings, various primary and secondary new energy sources have been developed and utilized. The emergence of lithium-ion secondary batteries meets people's needs for battery electrochemical performan...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58H01M4/1397
CPCH01M4/1397H01M4/58Y02E60/10
Inventor 张正富汤梦云
Owner KUNMING UNIV OF SCI & TECH
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