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Prussia white composite material and preparation method and application thereof

A composite material, Prussian white technology, applied in the field of new energy storage batteries, can solve the problems of poor crystallinity of ferrocyanide, reduce battery energy density, low capacity of sodium ion batteries, etc. Optimizing the effect of preparation

Active Publication Date: 2018-01-19
SHANGHAI HANHANG TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this kind of compound has poor electrical conductivity and low tap density, which leads to the need to add a lot of conductive agents to make batteries, which reduces the energy density of the battery. At the same time, the addition of conductive agents and low tap density of materials will lead to poor processing properties
In addition, this type of compound is easy to decompose at high temperature, and is generally prepared at low temperature, and the synthesis temperature is lower than 200°C. Therefore, the prepared ferrocyanide generally has poor crystallinity and high water content, which leads to its assembly as a positive electrode material. The Na-ion battery has a lower capacity and a lower charge and discharge voltage

Method used

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  • Prussia white composite material and preparation method and application thereof
  • Prussia white composite material and preparation method and application thereof
  • Prussia white composite material and preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0028] Sodium ferrocyanide is dissolved in deionized water, and stirred evenly to obtain solution A whose concentration is 0.1mol / L in terms of ferrocyanide ion; manganous chloride is dissolved in deionized water to obtain 2+ A solution with a metered concentration of 0.2mol / L, wherein the molar weight of manganese chloride is 1.5 times that of sodium ferrocyanide, plus fluorinated carbon nanotubes, the fluorine content of fluorinated carbon nanotubes is 15%, and the amount added It is 6% of the theoretical weight of Prussian white, and solution B is obtained through sufficient ultrasonic dispersion; then, under continuous stirring, solution B is added dropwise to solution A, and subjected to hydrothermal reaction at 80°C for 10 hours, and then cooled, washed, and vacuum The drying temperature is not lower than 120°C, and the drying time is not less than 12 hours to obtain the Prussian white composite material.

[0029] figure 1 The X-ray diffraction spectrum of the Prussian ...

Embodiment 2

[0041] Sodium ferrocyanide is dissolved in deionized water, and stirred evenly to obtain solution A whose concentration is 0.15mol / L in terms of ferrocyanide ion; manganous sulfate is dissolved in deionized water to obtain 2+ A solution with a metered concentration of 0.3 mol / L, wherein the molar weight of manganous sulfate is twice that of sodium ferrocyanide, and then adding fluorinated carbon nanotubes in an amount of 7% of the theoretical weight of Prussian white, which is obtained by fully stirring Solution B; then, under constant stirring, add solution B dropwise to solution A, and undergo hydrothermal reaction at 90°C for 8 hours, then cool, wash, and vacuum dry at a temperature not lower than 120°C, and the drying time is not less than 12 hours Then get the Prussian white composite material. XRD shows that the product is sodium ferromanganese cyanide in the rhombohedral phase. Scanning electron microscopy shows that the particle size of Prussian white is 300-500nm, and...

Embodiment 3

[0044] Dissolve sodium ferrocyanide in deionized water, stir evenly to obtain a solution A with a concentration of 0.2 mol / L in terms of ferrocyanide ions; dissolve manganese nitrate in deionized water to obtain 2+ A solution with a metered concentration of 0.4mol / L, wherein the molar weight of manganese nitrate is 2.5 times that of sodium ferrocyanide, then add fluorinated carbon nanotubes, the fluorine content of fluorinated carbon nanotubes is 10%, and the addition amount is 5% of the theoretical weight of Prussian white, after fully stirring to obtain solution B; then under continuous stirring, solution B was added dropwise to solution A, and subjected to hydrothermal reaction at 60°C for 6h, then cooled, washed, and vacuumed at 120°C A Prussian white composite was obtained after drying for 12 hours. XRD shows that the product is sodium ferromanganese cyanide in the rhombohedral phase. Scanning electron microscopy shows that the particle size of Prussian white is 300-500nm...

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Abstract

The invention discloses a Prussia white composite material and a preparation method and application thereof. The Prussia white composite material comprises the following steps of: (1) mixing sodium ferrocyanide or a hydrate thereof with deionized water to obtain solution A with concentration of 0.1 to 0.5mol / L; (2) mixing soluble salt containing divalent Mn2+ with deionized water, then adding fluoridized carbon nano-tubes, and by sufficiently dispersing, obtaining solution B, wherein concentration of Mn2+ in the solution B is 0.2 to 1.0mol / L; and (3) dropwise adding the solution B obtained inthe step (2) into the solution A obtained in the step (1), and by a hydrothermal reaction and post processing, obtaining the Prussia white composite material. According to the Prussia white compositematerial prepared by the method, the composite material is applied in a sodium-ion battery. The preparation method disclosed by the invention has the advantages of simple process, low cost, short period, low energy consumption, suitability for industrial production and the like.

Description

technical field [0001] The invention relates to the technical field of new energy storage batteries, in particular to a Prussian white composite material and its preparation method and application. Background technique [0002] With the development of society and economy, energy consumption is increasing day by day, traditional fossil energy continues to decrease, and human consumption of traditional fossil energy has caused serious environmental pollution. Under this environment, clean, renewable and cheap new energy It has become the object of development by governments of various countries. At present, the proportion of wind energy, solar energy and ocean energy in energy consumption is constantly increasing. However, these renewable energy sources are greatly affected by weather and time periods, and are obviously unstable, discontinuous and irresistible. control characteristics, it is necessary to develop and build supporting electric energy storage (energy storage) dev...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M10/054
CPCY02E60/10
Inventor 庄大高谢健邵博言石坚
Owner SHANGHAI HANHANG TECH CO LTD
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