Pyrophosphate assisted method used for synthesis of high performance prussian blue analogous

A pyrophosphate, Prussian blue technology, applied in ferricyanide, metal cyanide, structural parts, etc., can solve the problems affecting the electrochemical sodium storage performance of Prussian blue, poor crystallinity of Prussian blue, etc., to achieve regular morphology and price. Low cost, simple and convenient synthesis process

Inactive Publication Date: 2018-02-09
HUAZHONG UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the Prussian blue prepared by the traditional aqueous solution precipitation method has poor crystallinity, and Fe(CN) exists in the lattice. 6 The lack of structure, these defects seriously affect the electrochemical sodium storage performance of Prussian blue

Method used

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  • Pyrophosphate assisted method used for synthesis of high performance prussian blue analogous
  • Pyrophosphate assisted method used for synthesis of high performance prussian blue analogous
  • Pyrophosphate assisted method used for synthesis of high performance prussian blue analogous

Examples

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Embodiment 1

[0025] Embodiment one: if figure 1 , figure 2 Shown, a kind of preparation method of pyrophosphate assisted synthesis high-performance Prussian blue analogue, comprises the steps:

[0026] S100. Weigh 1mM (0.237g) nickel chloride and dissolve it in 20ml deionized water, stir until clarified, add 1mM sodium pyrophosphate, and continue stirring to obtain solution A;

[0027] S200. Weigh 0.5mM (0.165g) of potassium ferricyanide and add it into 50ml of deionized water and stir until clarified, then add 0.3g of PVP-K30 (polyvinylpyrrolidone-K30) and 10mM (0.584g) of sodium chloride and stir to obtain solution B;

[0028] S300. Use a peristaltic pump to add solution A dropwise to solution B while stirring at a rate of 1ml / min. After the addition is complete, stop stirring to obtain suspension C;

[0029] S400. Leave the suspension C to stand and age for 48 hours, filter out the light yellow precipitate obtained from aging, and use deionized water and absolute ethanol to alternate...

Embodiment 2

[0037] Embodiment two: a kind of preparation method of pyrophosphate assisted synthesis high-performance Prussian blue analogue, comprises the following steps:

[0038] S100. Weigh 0.5mM copper pyrophosphate and disperse it in 20ml deionized water, then add 0.5mM sodium pyrophosphate, and stir to obtain solution A;

[0039] S200. Weigh 0.3 g of sodium ferrocyanide and add it to 50 ml of deionized water, stir until clarified, then add 0.3 g of PVP-K30 and 10 mM (0.584 g) of sodium chloride, and stir to obtain solution B;

[0040] S300. Use a peristaltic pump to add solution A dropwise to solution B while stirring at a rate of 1ml / min. After the addition is complete, stop stirring to obtain suspension C;

[0041] S400. Leave the suspension C to stand and age for 120 hours, filter out the brick-red precipitate obtained from aging, and alternately wash the brick-red precipitate twice with deionized water and absolute ethanol, and then dry it at 80° C. for 12 hours. A golden-yello...

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Abstract

The invention relates to a pyrophosphate assisted method used for synthesis of high performance prussian blue analogous. The pyrophosphate assisted method used for synthesis of high performance prussian blue analogous comprises following steps: a pyrophosphate is mixed with a solvent so as to obtain a solution A; sodium ferrocyanide or potassium ferricyanide, sodium chloride, PVP, and water are mixed so as to obtain a solution B; the solution A is mixed with the solution B so as to obtain a suspension C; the suspension C is allowed to stand for aging, and a precipitate obtained via aging is collected via filtering so as to obtain the target product. The beneficial effects are that: the raw materials are cheap; the synthesis method is simple and convenient; experimental reproducibility is high; the obtained high performance prussian blue analogous is uniform in morphology and excellent in crystallinity; and it is confirmed via electrochemical tests that product crystallinity is increased effectively, and capacity is increased.

Description

technical field [0001] The invention relates to the technical field of manufacturing electrode materials for sodium ion batteries, in particular to a preparation method for pyrophosphate-assisted synthesis of high-performance Prussian blue analogues. Background technique [0002] Since the beginning of the 20th century, with the rapid development of economy, environmental pollution, greenhouse effect and energy crisis have become the focus of people's attention. Human society's demand for clean and renewable energy is increasing, so energy storage batteries have received extensive attention. Looking forward to the future power system, it uses solar energy, wind energy, water energy, and hydrogen fusion nuclear energy to generate electricity, and then transmits these electricity to cities through smart grids for production and living use. However, these natural energy sources are intermittently unstable, and if they are directly integrated into the grid, it will have a huge ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01C3/12H01M4/58H01M10/054
CPCC01C3/12C01P2002/72C01P2004/03C01P2006/40H01M4/58H01M10/054Y02E60/10
Inventor 韩建涛徐月
Owner HUAZHONG UNIV OF SCI & TECH
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