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Prussian blue material, and preparation method and application thereof

A technology of Prussian blue and reaction, applied in the direction of structural parts, electrical components, metal cyanide, etc., can solve the problems of affecting the cycle life and low actual capacity, and achieve the effect of long cycle life, high capacity and low energy consumption

Active Publication Date: 2020-03-27
ELECTRIC POWER RES INST OF STATE GRID ZHEJIANG ELECTRIC POWER COMAPNY +5
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, Prussian blue materials are generally synthesized in water, which contains more defects and crystal water, so the actual capacity is low; in addition, the released crystal water is easy to react with sodium salt to form hydrogen fluoride to corrode the material, which affects the cycle life

Method used

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  • Prussian blue material, and preparation method and application thereof
  • Prussian blue material, and preparation method and application thereof
  • Prussian blue material, and preparation method and application thereof

Examples

Experimental program
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Embodiment 1

[0031] Dissolve sodium ferrocyanide decahydrate in 50 ml of deionized water, stir evenly to obtain solution I with a concentration of 0.06 mol / L; dissolve ferrous sulfate, ascorbic acid, and sodium citrate in 50 ml of deionized water to obtain the concentration Solution II of 0.066mol / L, 0.04mol / L, and 1.4mol / L respectively; Add solution I and solution II to 100ml deionized water at the same time, and undergo co-precipitation reaction at 20℃, then wash and centrifuge Na is obtained after separation and vacuum drying x FeFe(CN) 6 .

[0032] figure 1 The XRD of the Prussian blue material prepared in this embodiment was analyzed as a monoclinic phase. figure 2 The SEM photo of the Prussian blue material prepared in this example shows that the particles exhibit a stepped cubic hierarchical structure, and the particle size is 3 to 5 microns. The Prussian blue material prepared in this example is used as the positive electrode, sodium metal is used as the negative electrode, glass fib...

Embodiment 2

[0044] Dissolve sodium ferrocyanide decahydrate in 50 ml of deionized water, stir evenly to obtain a solution I with a concentration of 0.01 mol / L; dissolve ferrous chloride, ascorbic acid, and sodium citrate in 50 ml of deionized water to obtain Solution II with concentrations of 0.0105 mol / L, 0.005 mol / L, and 0.1 mol / L; solution I and solution II were added to 100 ml of deionized water at the same time, co-precipitation reaction at 20 ℃, and then washing, Na is obtained after centrifugal separation and vacuum drying x FeFe(CN) 6 . After electrochemical test, when the current density is 15mA / g, the initial discharge capacity of the product can reach 115mAh / g.

Embodiment 3

[0046] Dissolve sodium ferrocyanide decahydrate in 50 ml of deionized water, stir evenly to obtain a solution I with a concentration of 0.1 mol / L; dissolve ferrous nitrate, ascorbic acid, and sodium citrate in 50 ml of deionized water to obtain the concentration 0.115mol / L, 0.1mol / L, and 5mol / L solution II; add solution I and solution II to 100ml of deionized water at the same time, after co-precipitation reaction at 20℃, then washing and centrifugal separation , Get Na after vacuum drying x FeFe(CN) 6 . After electrochemical testing, when the current density is 15mA / g, the initial discharge capacity of the product can reach 118mAh / g.

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Abstract

The invention discloses a Prussian blue material, and a preparation method and an application thereof. The preparation method comprises the steps: mixing sodium ferrocyanide or a hydrate of sodium ferrocyanide with deionized water to obtain a solution I; mixing soluble ferrous salt, ascorbic acid and sodium citrate with deionized water to obtain a solution II; dropwise adding the solution I and the solution II into deionized water at the same time, and carrying out a coprecipitation reaction to obtain a suspension of a Prussian blue material; and aging and post-processing the suspension to obtain the micron-sized Prussian blue material with a cubic stepped structure. The prepared Prussian blue material is applied to a positive electrode of a sodium ion battery, so that the capacity and thecycling stability of the sodium ion battery can be remarkably improved.

Description

Technical field [0001] The invention relates to the field of low-cost energy storage battery materials, in particular to a Prussian blue material and a preparation method and application thereof. Background technique [0002] With the increasingly serious energy and environmental problems on a global scale, the development of sustainable clean energy, such as solar, tidal energy, and wind energy, has received increasing attention. The effective use of these clean energy depends on high performance, sustainability, low cost and environmental friendliness. Energy storage battery. On the other hand, with the development of smart grids, energy storage batteries also play a key role in order to effectively use the grid. [0003] At present, common energy storage batteries include lithium-ion batteries, lead-acid batteries, and flow batteries. Lithium-ion batteries have high energy density and long life, but they are costly and subject to lithium resources, and they also face safety ri...

Claims

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Application Information

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IPC IPC(8): C01C3/12H01M4/58H01M10/054
CPCC01C3/12C01P2002/72C01P2004/03C01P2006/40H01M4/58H01M10/054Y02E60/10
Inventor 裘吕超曾挺健梅简谢健张杰王炯耿周正强赵洲峰熊建国杨帆黄弘扬贾成杰孙燕军聂建波张旭鲁旷达周宇通徐冬梅胡洁梓刘春丽李小英董栋易永利邹君文孙庆峰周桢
Owner ELECTRIC POWER RES INST OF STATE GRID ZHEJIANG ELECTRIC POWER COMAPNY
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