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Composite ferromanganese-based Prussian blue material and its preparation method and application

A composite ferromanganese-based, Prussian blue technology, applied in nanotechnology, ferricyanide, structural parts, etc. for materials and surface science, can solve the problem that the stability of materials has not been significantly improved and the precipitation reaction speed varies greatly , uniform mixing and other issues, to achieve the effect of improving cycle stability and rate performance, easy large-scale operation, and uniform particle size distribution

Active Publication Date: 2022-05-10
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Although the electrochemical performance of the disclosed Na-K composite Prussian blue cathode has been improved, the K + It will also be de-embedded in the framework structure with the electrochemical process, causing certain structural distortions and irreversible changes
In addition, the Na-K composite ferromanganese-based Prussian blue with better performance is mainly formed in situ during the electrochemical process, while the stability of the material prepared by direct co-precipitation has not been significantly improved, the reason is mainly due to the sub- The precipitation reaction rates of potassium ferricyanide manganese and sodium ferrocyanide manganese are quite different, and the two phase structures formed are difficult to mix uniformly at the microscopic scale

Method used

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  • Composite ferromanganese-based Prussian blue material and its preparation method and application
  • Composite ferromanganese-based Prussian blue material and its preparation method and application
  • Composite ferromanganese-based Prussian blue material and its preparation method and application

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Embodiment 1

[0103] A composite ferrocyanide-based Prussian blue material in which sodium ferrocyanide manganese is a matrix phase and cesium ferrocyanide manganese is a quantum dot stable phase, and is used to prepare a positive electrode material for a sodium ion battery. The specific preparation process is as follows:

[0104] A. Prepare 21mL solution A containing 0.2M sodium ferrocyanide decahydrate, 2g / L PVP, 2.8M sodium chloride and 0.04M cesium nitrate, and keep the temperature of solution A at 25°C;

[0105]B. Prepare 9 mL of solution B containing 0.7M manganese sulfate monohydrate, and keep the temperature of solution B at 25°C;

[0106] C. Drop solution B into solution A at a rate of 1mL / min, keep warm at 25°C for 19h, after the reaction, wash and separate the precipitate several times, and finally dry it in an ordinary oven at 80°C for 12h to obtain sub Cesium manganese ferricyanide sodium Prussian blue material.

[0107] For comparison, a single-phase sodium ferrocyanide manga...

Embodiment 2

[0118] A composite ferrocyanide-based Prussian blue material in which cesium ferrocyanide manganese cesium is a matrix phase and sodium ferrocyanide manganese is a quantum dot, and its specific preparation process is as follows:

[0119] A. Prepare 33 mL of solution A containing 0.03M sodium ferrocyanide decahydrate, 1.2M sodium citrate decahydrate and 0.075M cesium nitrate, and keep the temperature of solution A at 85°C;

[0120] B. Prepare 17 mL of solution B comprising 0.06M manganese sulfate monohydrate, 1.2M sodium citrate decahydrate and 0.075M cesium nitrate, and keep the temperature of solution B at 85°C;

[0121] C. Drop solution B into solution A at a rate of 1mL / min, keep warm at 85°C for 24h, after the reaction, cool, wash and separate the precipitate several times, and finally dry it in an ordinary oven at 80°C for 12h , Cesium ferrocyanide manganese sodium Prussian blue material.

[0122] Figure 10 It is the X-ray diffraction spectrum of the composite material...

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Abstract

The invention discloses a composite ferromanganese-based Prussian blue material, a preparation method and application thereof, and belongs to the technical field of material synthesis. The invention provides a composite ferromanganese-based Prussian blue material with a general chemical formula of Cs x Na y Mn[Fe(CN) 6 ] 1‑z ·nH 2 O, 0

Description

technical field [0001] The invention belongs to the technical field of material synthesis, and in particular relates to a composite ferromanganese-based Prussian blue material and its preparation method and application, more specifically a quantum dot composite ferromanganese-based Prussian blue material. Background technique [0002] Prussian blue-like materials are a class of materials with rigid framework structures and large interstitial ion channels, which have the advantages of low cost, simple synthesis process, and easy mass production. In the crystal lattice of Prussian blue materials, the metal and ferrocyanide are arranged into a three-dimensional skeleton structure according to –Fe–C≡N–M–, and Fe ions and transition metal M ions are arranged in a cubic shape, which is an open metal -Organic frame structure. There are large voids in the lattice, which provide abundant sites and transport channels for the reversible deintercalation of large-scale alkali metals (so...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01C3/12B82Y40/00B82Y30/00H01M10/054H01M4/58
CPCC01C3/12B82Y40/00B82Y30/00H01M4/58H01M10/054C01P2004/82C01P2004/64C01P2004/62Y02E60/10
Inventor 周爱军程威杰郭延东李晶泽
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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