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Preparation method of prussian white analogue with low defects and low water content

An analog, low-defect technology, applied in the direction of ferricyanide, metal cyanide, etc., can solve the problems of high water content and many defects, and achieve the effects of increasing active potassium content, good thermal stability, and simple process

Active Publication Date: 2020-11-17
BEIHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problems of more defects and higher water content in Prussian white analogues at present, the present invention adopts a complexation-assisted synthesis method to prepare Prussian white analogues with low defects and low water content, thereby improving the material's Thermal Stability and Its Electrochemical Cycling Stability in Potassium-ion Batteries

Method used

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  • Preparation method of prussian white analogue with low defects and low water content
  • Preparation method of prussian white analogue with low defects and low water content
  • Preparation method of prussian white analogue with low defects and low water content

Examples

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Effect test

Embodiment 1

[0034] A method for preparing a Prussian white analog with low defects and low water content, comprising the following steps:

[0035] Step 1: Preparation of Solution A

[0036] Weigh 2.11g K 4 Fe(CN) 6 ·3H 2 O was dissolved in 100mL of water and stirred until dissolved to obtain solution A.

[0037] Step 2: Preparation of Solution B

[0038] Weigh 0.85g MnSO 4 ·H 2 O and 2.02g EDTA-2K 2H 2 O was dissolved in 100mL of water and stirred until dissolved to obtain solution B.

[0039] Step 3: Under nitrogen atmosphere, add solution B to solution A while stirring to produce a white precipitate. After adding solution B, let it stand for 24 hours, filter and wash the resulting white precipitate, and dry it at 80°C for 24 hours. A Prussian white analogue with low defects and low water content was obtained as the final target product.

[0040] Step 4: Characterize the morphology of the prepared Prussian white analog using scanning electron microscope (SEM), X-ray diffractomet...

Embodiment 2

[0043] Step 1 is the same as Example 1

[0044] Step 2: Preparation of Solution B

[0045] Weigh 0.99g MnCl 2 4H 2 O and 2.02g EDTA-2K 2H 2 O was dissolved in 100mL of water and stirred until dissolved to obtain solution B.

[0046] Steps 3 and 4 are the same as in Example 1

[0047] The Prussian white analog prepared in this example is the same as that in Example 1, and the Prussian white analog has the characteristics of low defects and low water content.

Embodiment 3

[0049] Step 1 is the same as Example 1

[0050] Step 2: Preparation of Solution B

[0051] Weigh 0.99g MnCl 2 4H 2 O and 1.86g EDTA-2Na·2H 2 O was dissolved in 100mL of water and stirred until dissolved to obtain solution B.

[0052] Steps 3 and 4 are the same as in Example 1

[0053] The Prussian white analog prepared in this example is the same as that in Example 1, and the Prussian white analog has the characteristics of low defects and low water content.

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Abstract

The invention discloses a preparation method of a prussian white analogue with low defects and low water content, the chemical formula of the prussian white analogue is KxMn[Fe(CN)6]1-y.zH2O, the value range of x is 1.7-2.0, the value range of y is 0-0.05, and the value range of z is 0.05-0.3. The preparation method comprises the following steps: dissolving potassium ferrocyanide in water to obtain a solution A; dissolving a soluble divalent manganese salt and a complexing agent ethylenediamine tetraacetic acid salt in water to obtain a solution B; and adding the solution B into the solution Aunder the conditions of reaction atmosphere and stirring the mixed solution at room temperature, and carrying out standing, filtering, washing and drying treatment to obtain the low-defect and low-water-content Prussian white analogue. According to the invention, the Prussian white analogue with low defect and low water content is prepared by adopting a complexing-assisted synthesis method, so that the thermal stability of the material and the electrochemical cycling stability of the material in a potassium ion battery are improved.

Description

technical field [0001] The invention belongs to the field of preparation of Prussian white analogues, in particular to a method for controllable preparation of Prussian white analogues with low defects and low water content. Background technique [0002] Metal organic frameworks (MOFs) have been widely studied due to their wide variety, tunable pore size, and easy functionalization. MOFs materials have good application prospects in the fields of gas adsorption and separation, catalysis, biomedicine, and energy. Among them, ferromanganese-based Prussian white analogs are a class of compounds with an open three-dimensional pore structure, and their chemical formula can be expressed as A x Mn[Fe(CN) 6 ] 1-y ·zH 2 O, where A is Na or K ion, x≤2.0, y≤1, z>0. Ferromanganese-based Prussian white analogues show high working voltage and large reversible capacity when used as cathode materials for sodium and potassium ion batteries. At present, the capacity fading of such mate...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01C3/12
CPCC01C3/12C01P2002/72
Inventor 朱禹洁邓乐庆
Owner BEIHANG UNIV
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