Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Prussian blue and analogue thereof, and defect repair method and application thereof

A Prussian blue and defect repairing technology, applied in the direction of ferricyanide, metal cyanide, active material electrodes, etc., can solve the problems of low yield, long reaction time, clogged iron base, etc., and achieve the improvement of charge-discharge specific capacity and cycle The effect of stability improvement and vacancy defect reduction

Active Publication Date: 2021-09-07
HUAZHONG UNIV OF SCI & TECH
View PDF5 Cites 7 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In 2014, researcher Guo Yuguo and his colleagues used Na 4 Fe(CN) 6 As the sole iron source, low-defect Na 0.61 Fe[Fe(CN) 6 ] 0.94 Cathode material for sodium storage, showing very high specific capacity of sodium storage and good cycle stability (Ya You, Xing-Long Wu, Ya-Xia Yin, and Yu-Guo Guo, High-quality prussian blue crystals as superior cathode materials forroom-temperature sodium-ion batteries, Energy&Environmental Science, 2014, 7, 1643); in 2015, the team of Professor Goodenough, the Nobel Laureate in Chemistry, used Na 4 Fe(CN) 6 As a single iron source, a sodium-rich sodium-storage cathode Na was obtained via a hydrothermal synthesis method 1.92 Fe[Fe(CN) 6 ], which can provide a specific capacity of 157 mA / g at a current density of 15 mA / g (L.Wang, J.Song, R.Qiao, L.A.Wray, M.A.Hossain, Y.D.Chuang, W.Yang, Y.Lu, D.Evans, J.J.Lee, S.Vail, X.Zhao, M.Nishijima, S.Kakimoto and J.B.Goodenough, Rhombohedral Prussian White as Cathode for RechargeableSodiumIon Batteries, Journal of the American Chemical Society, 2015, 137, 2548 -2554.). However, the single iron source solution method is not suitable for large-scale preparation of iron-based Prussian blue due to the release of toxic ions and low yield during the preparation process
[0004] Among the above-mentioned methods, the single-iron source solution method generates larger product particles and high quality, but the yield is low, the reaction time is very long, and it is easy to release toxic substances; the double-iron source co-precipitation method has a higher yield, but There is often a large amount of [Fe(CN) 6 ] 4- Vacancy defects and coordinated water, which can seriously affect the structural integrity of the material
Coordinated water may occupy vacancies and block the three-dimensional open channels of iron-based Prussian blue, especially when used as an electrode material, coordinated water may move during the electrochemical process, resulting in the collapse of the Prussian blue structure

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Prussian blue and analogue thereof, and defect repair method and application thereof
  • Prussian blue and analogue thereof, and defect repair method and application thereof
  • Prussian blue and analogue thereof, and defect repair method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] This embodiment provides a method for repairing defects of Prussian blue and its analogs, the repaired Prussian blue and its analogs obtained through the repair, and using the Prussian blue and its analogs as anode materials for sodium-ion batteries. The method comprises the steps of:

[0034] S1 Add 48.4 grams of sodium ferrocyanide powder with a purity greater than 99.5% into 100 ml of deionized water, and stir at a temperature of 40°C until a nearly saturated yellow solution of sodium ferrocyanide is formed 1;

[0035] S2 prepared the original material of Prussian blue by traditional dual-iron source co-precipitation method. Specifically, 1.112 grams of ferrous sulfate and 20 grams of sodium ferrocyanide were added to 100 milliliters of deionized water to prepare solution A, and then 0.484 grams of sodium ferrocyanide was dissolved in 100 milliliters of deionized water to be solution B. The AB solution was mixed, stirred for 1 hour, and stood at room temperature for...

Embodiment 2

[0044] This embodiment provides a method for repairing defects of Prussian blue and its analogs, the repaired Prussian blue and its analogs obtained through the repair, and using the Prussian blue and its analogs as anode materials for sodium-ion batteries. The method comprises the steps of:

[0045] S1 Add 48.4 grams of sodium ferrocyanide powder with a purity greater than 99.5% into 100 ml of deionized water, and stir at a temperature of 40°C until a nearly saturated yellow solution of sodium ferrocyanide is formed 1;

[0046] S2 prepared the original material of Prussian blue by traditional dual-iron source co-precipitation method. Specifically, 1.112 grams of ferrous sulfate and 20 grams of sodium ferrocyanide were added to 100 milliliters of deionized water to prepare solution A, and then 0.484 grams of sodium ferrocyanide was dissolved in 100 milliliters of deionized water to be solution B. The AB solution was mixed, stirred for 1 hour, and stood at room temperature for...

Embodiment 3

[0052] This embodiment provides a method for repairing defects of Prussian blue and its analogs, the repaired Prussian blue and its analogs obtained through the repair, and using the Prussian blue and its analogs as anode materials for sodium-ion batteries. The method comprises the steps of:

[0053] S1 Add 48.4 grams of sodium ferrocyanide powder with a purity greater than 99.5% into 100 ml of deionized water, and stir at a temperature of 40°C until a nearly saturated yellow solution of sodium ferrocyanide is formed 1;

[0054] S2 uses commercial sodium-free Prussian blue as the raw material, CAS: 14038-43-8, manufacturer: Aladdin, specification: 25 grams;

[0055] S3 Take 0.5 g of the original powder of S2 Prussian blue and add it to solution 1, stir at 40°C for 12 hours and then let it stand for 2 hours to obtain a precipitate;

[0056] S4 collects the precipitate obtained in step S3 by centrifugation, and rinses with deionized water and absolute ethanol for 3 times;

[0...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
sizeaaaaaaaaaa
Login to View More

Abstract

The invention discloses Prussian blue and an analogue thereof, and a defect repairing method and an application thereof. The method comprises the steps: (1) dissolving salt containing ferrous cyanide ions into a deionized water solution to obtain a salt solution; and (2) soaking the Prussian blue and the analogue thereof in the salt solution, continuously stirring for a preset time, standing to obtain a precipitate, and cleaning and drying the precipitate to obtain the Prussian blue and the analogue thereof which are subjected to defect repair. According to the method, the [Fe(CN)6]<4-> vacancy defect existing in traditional Prussian blue and the analogue thereof is directly repaired by using the salt solution containing ferrous cyanide anions, and anion regulation is realized, so that the vacancy defects of the Prussian blue and the analogue thereof are reduced, the crystal water is reduced, and the phase structure is more complete. The repaired Prussian blue material can be used as a sodium-ion battery positive electrode material, and the cycling stability and the charge-discharge specific capacity of the sodium-ion battery positive electrode material are greatly improved.

Description

technical field [0001] The invention belongs to the field of Prussian blue and its analogs, and more specifically relates to a Prussian blue and its analogs, a defect repairing method and applications thereof. Background technique [0002] The simple preparation process is an important feature of the Prussian blue material. The main synthesis methods of iron-based Prussian blue can be divided into single iron source solution method and double iron source co-precipitation method. In 2014, researcher Guo Yuguo and his colleagues used Na 4 Fe(CN) 6 As the sole iron source, low-defect Na 0.61 Fe[Fe(CN) 6 ] 0.94 Cathode material for sodium storage, showing very high specific capacity of sodium storage and good cycle stability (Ya You, Xing-Long Wu, Ya-Xia Yin, and Yu-Guo Guo, High-quality prussian blue crystals as superior cathode materials forroom-temperature sodium-ion batteries, Energy&Environmental Science, 2014, 7, 1643); in 2015, the team of Professor Goodenough, the ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): C01C3/12H01M10/054H01M4/58
CPCC01C3/12H01M10/054H01M4/58H01M2004/028C01P2006/40Y02E60/10
Inventor 黄云辉万忞
Owner HUAZHONG UNIV OF SCI & TECH
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com