Prussian blue cathode material with high sodium content, preparation method and applications thereof, and sodium ion battery

A technology of Prussian blue and cathode materials, applied in the field of Prussian blue cathode materials with high sodium content and its preparation, and sodium ion batteries, can solve the problems of difficult control of reaction speed, influence on electrochemical performance, and difficulty in solid-liquid separation, and achieve easy industrial Large-scale production, excellent electrochemical performance, simple and easy-to-operate preparation method

Active Publication Date: 2019-09-13
LIAONING STARRY SKY SODIUM BATTERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above synthesis method simply mixes the transition metal salt and sodium ferrocyanide solution, and the reaction speed is difficult to control, resulting in poor crystallinity of the material and low sodium content, and the Prussian blue material with small nano-particles will also make the solid-liquid process in the production process Separation is difficult and production efficiency is low. At the same time, the size of nanoparticles will also cause difficulties in the coating process of the pole piece, which will affect the electrochemical performance

Method used

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  • Prussian blue cathode material with high sodium content, preparation method and applications thereof, and sodium ion battery
  • Prussian blue cathode material with high sodium content, preparation method and applications thereof, and sodium ion battery
  • Prussian blue cathode material with high sodium content, preparation method and applications thereof, and sodium ion battery

Examples

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Effect test

Embodiment 1

[0045] Preparation of Prussian blue cathode material:

[0046] (1) Nitrogen gas was blown into container A at 25°C, and 100ml of deionized water was added, followed by dissolving 0.1g of ascorbic acid, 6mmol of ferrous sulfate heptahydrate, 12mmol of citric acid, and 6mmol of sodium sulfate in container A, and adding ammonia water Adjust the pH of the solution in container A = 6.5. Nitrogen gas was passed into container B at 25°C, 100ml of deionized water was added, and then 0.1g of ascorbic acid, 4mmol of sodium ferrocyanide decahydrate, and 6mmol of sodium sulfate were dissolved in container B in turn, and the pH of the solution in container B = 6.5.

[0047] (2) Nitrogen gas is passed into container C at 25°C, and then the solutions in container A and container B are simultaneously added dropwise to container C at a speed of 2ml / min through a peristaltic pump, and the stirring speed in container C is 1000 Turn per hour, after all the solutions in container A and container...

Embodiment 2

[0052] Preparation of Prussian blue cathode material:

[0053] (1) At 25°C, blow nitrogen into container A, add 100ml of deionized water, then dissolve 0.1g of ascorbic acid, 6mmol of ferrous sulfate heptahydrate, 12mmol of citric acid, and 8mmol of sodium sulfate in container A, and add ammonia water Adjust the pH of the solution in container A = 6.5. Nitrogen gas was passed into container B at 25°C, 100ml of deionized water was added, and then 0.1g of ascorbic acid, 4mmol of sodium ferrocyanide decahydrate, and 8mmol of sodium sulfate were dissolved in container B in turn, and the pH of the solution in container B = 6.5.

[0054] (2) Nitrogen gas is passed into container C at 25°C, and then the solutions in container A and container B are simultaneously added dropwise to container C at a speed of 2ml / min through a peristaltic pump, and the stirring speed in container C is 1000 Turn per hour, after all the solutions in container A and container B are added to container C, c...

Embodiment 3

[0059] Preparation of Prussian blue cathode material:

[0060] (1) Nitrogen gas was passed into container A at 25°C, and 100ml of deionized water was added, followed by dissolving 0.1g of ascorbic acid, 4mmol of ferrous sulfate heptahydrate, 2mmol of manganese sulfate monohydrate, 12mmol of citric acid, and 10mmol of sodium sulfate in In container A, add ammonia water to adjust the pH of the solution in container A=6.5. Nitrogen gas was blown into container B at 25°C, 100ml of deionized water was added, and then 0.1g of ascorbic acid, 4mmol of sodium ferrocyanide decahydrate, and 10mmol of sodium sulfate were dissolved in container B in sequence, and the pH of the solution in container B = 6.5.

[0061] (3) Nitrogen gas is passed into container C at 25°C, and then the solutions in container A and container B are simultaneously dripped into container C at a speed of 2ml / min through a peristaltic pump, and the stirring speed in container C is 1000 Turn per hour, after all the ...

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Abstract

The invention belongs to the technical field of novel energy storage materials, and relates to a Prussian blue cathode material with a high sodium content, a preparation method and applications thereof, and a sodium ion battery. The molecular formula of the Prussian blue cathode material is Na<x>MNFe(CN)<6>; wherein M and N represent a same transition metal or different transition metals andcan be Fe, Co, Mn, Ni, Cu, Zn, Cr, V, Zr, or Ti; 1.8<x<2; 0<a<1; 0<b<1; and a+b=1. The cathode material has millimeter cubic morphology and excellent electrochemical properties. The preparation method has the advantages that the crystallization is slow, the sodium content of the cathode material is high, the preparation method is simple and easy to perform, the production efficiency and the yieldare high, the raw materials are cheap, and industrial production and enlarged production are easy to realize.

Description

technical field [0001] The invention belongs to the technical field of new energy storage materials, and more specifically relates to a Prussian blue positive electrode material with high sodium content, a preparation method and application thereof, and a sodium ion battery. Background technique [0002] Due to the intensification of the greenhouse effect and environmental problems in recent years, the development and utilization of clean energy has become an effective means to improve the environment. Wind energy, solar energy, and tidal energy can be stored and utilized through battery energy storage devices. Lithium-ion batteries have dominated the market for the past two decades. However, the global lithium resources are limited and the price keeps rising, so the development and utilization of sodium-ion batteries with abundant resources and low prices has become the next goal and task. Due to the similar chemical properties of sodium and lithium, sodium-ion batteries ar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58H01M10/054C01C3/12
CPCH01M4/58H01M10/054C01C3/12H01M2004/028Y02E60/10
Inventor 王晚林李用成李东祥宫毅涛李亚书其他发明人请求不公开姓名
Owner LIAONING STARRY SKY SODIUM BATTERY CO LTD
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