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Iron-based Prussian blue, and preparation method and application thereof

A Prussian blue, iron-based technology, used in ferricyanide, structural parts, metal cyanide, etc., can solve the problems of insufficient specific energy of electrode materials, restricting the large-scale application of materials, and easy to release toxic substances, and achieve safe production process. Non-toxicity, cycle stability, improved charge-discharge specific capacity, and fewer product defects

Active Publication Date: 2021-10-08
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Among the above methods, the single iron source solution method produces a product with a larger particle size and high quality, but the yield is low, the reaction time is long, and it is easy to Toxic substances are released; the yield of the dual-iron source co-precipitation method is high, but when the obtained product is used as a sodium storage cathode material, the actual specific capacity provided by it is often far lower than the theoretical specific capacity, especially the capacity of high potential is poor. As a result, the specific energy of the electrode material is insufficient, which seriously restricts the actual large-scale application of the material.

Method used

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  • Iron-based Prussian blue, and preparation method and application thereof
  • Iron-based Prussian blue, and preparation method and application thereof
  • Iron-based Prussian blue, and preparation method and application thereof

Examples

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Embodiment 1

[0032] This embodiment provides a preparation method of iron-based Prussian blue, the iron-based Prussian blue prepared by the preparation method and the iron-based Prussian blue as a positive electrode material for a sodium ion battery. The method comprises the steps of:

[0033] Add 48.4 grams of sodium ferrocyanide powder with a purity greater than 99.5% into 100 ml of deionized water, and stir at 40°C until a nearly saturated yellow solution of sodium ferrocyanide is formed 1;

[0034] S2 Add 0.556 g of ferrous sulfate powder with a purity greater than 99.5% and 5 g of trisodium citrate into 100 ml of deionized water, and stir until a clear solution 2 is formed;

[0035] In S3, the solution 1 obtained in the above steps is directly poured into the solution 2, and the mixed solution is continuously stirred for 0.5 hours, and then left to stand at a temperature of 25°C for 24 hours to obtain a light blue precipitate;

[0036] S4 collects the blue precipitate obtained in ste...

Embodiment 2

[0041] This embodiment provides a preparation method of iron-based Prussian blue, the iron-based Prussian blue prepared by the preparation method and the iron-based Prussian blue as a positive electrode material for a sodium ion battery. The method comprises the steps of:

[0042] Add 48.4 grams of sodium ferrocyanide powder with a purity greater than 99.5% into 100 ml of deionized water, and stir at 40°C until a nearly saturated yellow solution of sodium ferrocyanide is formed 1;

[0043] S2 Add 0.446 grams of manganese sulfate powder with a purity greater than 99.5% and 5 grams of trisodium citrate into 100 milliliters of deionized water, and stir until a clear solution 2 is formed;

[0044] In S3, the solution 1 obtained in the above steps is directly poured into the solution 2, and the mixed solution is continuously stirred for 0.5 hours, and then left to stand at a temperature of 25° C. for 24 hours to obtain a white precipitate;

[0045] S4 collects the blue precipitate...

Embodiment 3

[0060] This embodiment provides a preparation method of iron-based Prussian blue, the iron-based Prussian blue prepared by the preparation method and the iron-based Prussian blue as a positive electrode material for a sodium ion battery. The method comprises the steps of:

[0061] Add 30 grams of sodium ferrocyanide powder with a purity greater than 99.5% into 100 milliliters of deionized water, and stir at a temperature of 40°C until a nearly saturated yellow solution 1 of sodium ferrocyanide is formed; the salt solution 1 has a concentration of 0.62 mol / L nearly saturated solution;

[0062] S2 Add 0.556 g of ferrous sulfate powder with a purity greater than 99.5% and 5 g of trisodium citrate into 100 ml of deionized water, and stir until a clear solution 2 is formed;

[0063] In S3, the solution 1 obtained in the above steps is directly poured into the solution 2, and the mixed solution is continuously stirred for 0.5 hours, and then left to stand at a temperature of 25°C f...

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Abstract

The invention discloses iron-based prussian blue, and a preparation method and application thereof. The method comprises the following steps: (1) dissolving salt containing ferrous cyanide ions into a deionized water solution to obtain a first salt solution, wherein the content of ferrocyanide ions in the first salt solution exceeds the content of ferrocyanide ions calculated according to the stoichiometric ratio required by the iron-based Prussian blue; (2) dissolving salt containing ferrous ions or manganese ions into a deionized water solution, and adding trisodium citrate to obtain a second salt solution; and (3) pouring the first salt solution into the second salt solution, stirring and standing to obtain a precipitate, and cleaning and drying the precipitate to obtain the iron-based prussian blue. A large amount of Na<+> and Fe(CN)6<4-> are introduced into the precursor solution, the [Fe(CN)6]<4-> vacancy defect and coordination water which are prone to occurring in the product obtained through a coprecipitation method are reduced, the preparation process is simple, and the technical problems that the synthesis condition of iron-based Prussian blue is harsh, the sodium content in the product is low, and the volume is low are solved.

Description

technical field [0001] The invention belongs to the field of iron-based Prussian blue, and more specifically relates to an iron-based Prussian blue, a preparation method and an application thereof. Background technique [0002] The synthetic methods of iron-based Prussian blue and its analogues mainly focus on the single-iron source hydrothermal method and the double-iron source co-precipitation method using water as a solvent: (1) the single iron source solution method is mainly based on Na 4 Fe(CN) 6 As a raw material, dissolved in a certain amount of deionized water to form Na 4 Fe(CN) 6 Aqueous solution, using a weak acid to adjust the pH value of the solution, and then transfer the solution into a high-pressure reactor, and conduct a hydrothermal reaction at 140°C for 20 hours. In 2015, John B. Goodenough synthesized iron-iron Prussian blue analog crystals using a single-iron source hydrothermal method (L.Wang, J.Song, R.Qiao, L.A.Wray, M.A.Hossain, Y.D.Chuang, W.Yan...

Claims

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Application Information

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IPC IPC(8): C01C3/12H01M4/58H01M10/054
CPCC01C3/12H01M4/58H01M10/054H01M2004/028C01P2002/72C01P2004/03C01P2006/40C01P2004/62Y02E60/10
Inventor 黄云辉万忞
Owner HUAZHONG UNIV OF SCI & TECH
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