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Preparation method of polydopamine-coated sodium-iron-based Prussian blue electrode material

A polydopamine, Prussian blue technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of structural instability, affecting cycle stability and rate performance, poor electronic conductivity, etc. Chemical properties, the effect of easy availability of raw materials

Active Publication Date: 2020-05-05
HENAN NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, NaFe-based Prussian blue electrode materials still have some disadvantages, such as poor electronic conductivity and unstable structure during cycling, which affect their cycle stability and rate performance.

Method used

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  • Preparation method of polydopamine-coated sodium-iron-based Prussian blue electrode material
  • Preparation method of polydopamine-coated sodium-iron-based Prussian blue electrode material
  • Preparation method of polydopamine-coated sodium-iron-based Prussian blue electrode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] (1) Put 1.94g of sodium ferrocyanide in a container, add 200mL of deionized water and stir to dissolve to obtain solution A; put 1.67g of ferrous sulfate and 5g of sodium citrate into a container, add 200mL of deionized water and stir to dissolve Obtain solution B; mix solution A and solution B evenly, age at 75°C for 24 hours, wash with water three times, wash with alcohol three times, and dry to obtain sodium-iron-based Prussian blue material (NFF).

[0030] (2) Put 0.005mol dopamine hydrochloride in a container, add 40mL deionized water and 2.1mL concentrated hydrochloric acid to dissolve, and use a 50mL volumetric flask to obtain a dopamine solution with a molar concentration of 0.1mol / L; take the prepared NFF sample Put 0.1g in a container, add 30mL of deionized water to dissolve to obtain NFF solution; put 2.5mL of dopamine solution and 0.5g of sodium citrate in a container, add 30mL of deionized water to dissolve, and mix the solution with NFF solution evenly, at ...

Embodiment 2

[0033] (1) Put 1.94g of sodium ferrocyanide in a container, add 200mL of deionized water and stir to dissolve to obtain solution A; put 1.67g of ferrous sulfate and 5g of sodium citrate into a container, add 200mL of deionized water and stir to dissolve Obtain solution B; mix solution A and solution B evenly, age at 75°C for 24 hours, wash with water three times, wash with alcohol three times, and dry to obtain sodium-iron-based Prussian blue material (NFF).

[0034] (2) Put 0.005mol dopamine hydrochloride in a container, add 40mL deionized water and 2.1mL concentrated hydrochloric acid to dissolve, and use a 50mL volumetric flask to obtain a dopamine solution with a molar concentration of 0.1mol / L; take the prepared NFF sample 0.1g was placed in a container, and 30mL of deionized water was added to dissolve to obtain NFF solution; 5mL of dopamine solution and 0.5g of sodium citrate were placed in a container, and 30mL of deionized water was added to dissolve, and the solution ...

Embodiment 3

[0037] (1) Put 1.94g of sodium ferrocyanide in a container, add 200mL of deionized water and stir to dissolve to obtain solution A; put 1.67g of ferrous sulfate and 5g of sodium citrate into a container, add 200mL of deionized water and stir to dissolve Obtain solution B; mix solution A and solution B evenly, age at 75°C for 24 hours, wash with water three times, wash with alcohol three times, and dry to obtain sodium-iron-based Prussian blue material (NFF).

[0038](2) Put 0.005mol dopamine hydrochloride in a container, add 40mL deionized water and 2.1mL concentrated hydrochloric acid to dissolve, and use a 50mL volumetric flask to obtain a dopamine solution with a molar concentration of 0.1mol / L; take the prepared NFF sample 0.1g was placed in a container, and 30mL of deionized water was added to dissolve to obtain NFF solution; 10mL of dopamine solution and 0.5g of sodium citrate were placed in a container, and 30mL of deionized water was added to dissolve, and the solution ...

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Abstract

The invention discloses a preparation method of a polydopamine coated sodium iron base Prussian blue electrode material. The preparation method of the polydopamine coated sodium iron base Prussian blue electrode material comprises the following steps: adding a soluble metal salt containing iron cyanogen ions into water to obtain a solution A; adding the soluble metal salt or the soluble metal salt and complexing agent to water to obtain a solution B; performing ageing treatment at 50-150 degrees centigrade to obtain the sodium iron base Prussian blue material after mixing the solution A with the solution B evenly; adding the dopamine hydrochloride to deionized water and concentrated hydrochloric acid to obtain a dopamine solution; adding the sodium iron base Prussian blue material to water to obtain a solution C; adding the dopamine solution and the complexing agent to water to obtain a solution D; adding the solution D into the solution C and mixing evenly; and then standing at room temperature to obtain the polydopamine coated sodium iron base Prussian blue electrode material. According to the preparation method of the polydopamine coated sodium iron base Prussian blue electrode material, the raw materials are cheap and easy to obtain, the preparation method is simple, the process route is simple, and the industrialized continuous production is easy to realize.

Description

technical field [0001] The invention belongs to the technical field of synthesis of positive electrode materials for sodium ion batteries, and in particular relates to a preparation method of polydopamine-coated sodium-iron-based Prussian blue electrode materials. Background technique [0002] With the rapid development of renewable energy and the vigorous promotion of smart grids, advanced electrochemical energy storage technology is particularly important. At present, among various technologies for electrochemical energy storage, lithium-ion batteries are widely used in the portable electronics market due to their advantages such as high energy density, long cycle life, and no memory effect, and are also used in the electric vehicle industry. However, due to the shortage of lithium resources and high cost and price, the practical application of lithium-ion batteries in the field of electrochemical energy storage has been greatly challenged. Compared with lithium, sodium i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M10/054
CPCH01M4/366H01M4/58H01M4/624H01M4/628H01M10/054Y02E60/10
Inventor 刘阳何丹丹乔芸
Owner HENAN NORMAL UNIV