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Prussian blue positive electrode material and sodium ion battery

A cathode material, Prussian blue technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problem of internal vacancies, high content of crystal water and coordination water, imperfect crystal structure of Prussian blue materials, and cathode materials for sodium ion batteries. Problems such as low capacity, to achieve the effect of good battery stability, less defects and water content, less moisture content

Inactive Publication Date: 2017-11-21
GLOBAL ENERGY INTERCONNECTION RES INST CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the crystal structure of the Prussian blue material obtained by a single co-precipitation method is not perfect, and the internal vacancies, crystal water and coordination water content are more, and the material obtained by this method has low capacity and poor cycle performance. The size is small, the coating process is difficult, and it is difficult to achieve large-scale application

Method used

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  • Prussian blue positive electrode material and sodium ion battery
  • Prussian blue positive electrode material and sodium ion battery
  • Prussian blue positive electrode material and sodium ion battery

Examples

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Effect test

Embodiment 1

[0025] Preparation of Prussian blue cathode material:

[0026] (1) Take 0.16mol MnCl 4H 2 O was dissolved in 200ml deionized water, named solution ①; take 0.08molNa 4 Fe(CN) 6 10H 2 O and 0.4mol of NaCl were dissolved in 200ml of deionized water, and named solution ②. Heat No. ② solution to 90°C, slowly pump No. ① solution into No. ② solution with a peristaltic pump, and keep warm for 4 hours.

[0027] (2) Transfer the solution to the reaction kettle and heat it at 120°C for 8h

[0028] (3) Suction filtration, vacuum drying at 100°C for 24h, the molecular formula is Na 1.8 mn 0.4 Fe(CN) 6 Prussian blue cathode material.

[0029] Preparation of Na-ion battery:

[0030] The obtained positive electrode material is assembled with a diaphragm, metallic sodium and an organic electrolyte to obtain a battery based on the prepared Prussian blue positive electrode material.

Embodiment 2

[0032] Preparation of Prussian blue cathode material:

[0033] (1) 0.16mol MnCl 4H 2 O was dissolved in 200ml deionized water, named solution ①; 0.08 mol Na 4 Fe(CN) 6 10H 2 O and 0.4mol of NaCl were dissolved in 200ml of deionized water, and named solution ②. Heat No. ② solution to 50°C, slowly pump No. ① solution into No. ② solution with a peristaltic pump, and keep warm for 4 hours;

[0034] (2) Transfer the solution to a reaction kettle, heat and keep it warm at 150°C for 8h;

[0035] (3) Suction filtration, vacuum drying at 100°C for 24h, the molecular formula is Na 1.8 mn 0.4 Fe(CN) 6 Prussian blue cathode material.

[0036] Preparation of Na-ion battery:

[0037] The obtained positive electrode material is assembled with a diaphragm, metallic sodium and an organic electrolyte to obtain a battery based on the prepared Prussian blue positive electrode material.

Embodiment 3

[0039] Preparation of Prussian blue cathode material:

[0040] (1) 0.16mol MnCl 4H 2 O was dissolved in 200ml deionized water, named solution ①; 0.08 mol Na 4 Fe(CN) 6 10H 2 O and 0.4mol of NaCl were dissolved in 200ml of deionized water, and named solution ②. Heat No. ② solution to 90°C, slowly pump No. ① solution into No. ② solution with a peristaltic pump, and keep warm for 4 hours

[0041] (2) Pump the solution into the spray dryer, and set the temperature of the spray dryer to 120°C

[0042] (3) The obtained powder is vacuum dried at 100°C for 24 hours, and the molecular formula is Na 1.8 mn 0.4 Fe(CN) 6 Prussian blue cathode material.

[0043] Preparation of Na-ion battery:

[0044] The obtained positive electrode material is assembled with a diaphragm, metallic sodium and an organic electrolyte to obtain a battery based on the prepared Prussian blue positive electrode material.

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Abstract

The invention discloses a Prussian blue positive electrode material and a sodium ion battery. The preparation method comprises that the salt solution of M creeps to the mixed solution of Na4Fe(CN)6 and a sodium salt, the obtained solution is heated in a protective atmosphere to obtain a Prussian blue intermediate, the intermediate solution is transferred into a high-pressure reaction kettle, and a heating reaction is performed at a certain temperature to obtain the Prussian blue positive electrode material, or the intermediate solution is subjected to high-temperature spray drying to obtain the Prussian blue material powder. According to the present invention, through the high-temperature and normal pressure reaction and the high-pressure and high-pressure heating reaction, the prepared material has advantages of perfect crystal structure, less defect and low water content, and can improve the specific capacity and the stability of the battery in the application as the sodium ion battery positive electrode material; and the preparation method is simple, and is suitable for continuous large-scale production.

Description

technical field [0001] The invention relates to a new energy storage material, in particular to a preparation method of a Prussian blue positive electrode material and a sodium ion battery. Background technique [0002] The sodium element in the earth's crust is abundant, and the cost of the key materials of the corresponding sodium-ion battery is relatively low. Sodium-ion battery is expected to become one of the next-generation large-scale energy storage technologies. There are many types of electrode materials for sodium-ion batteries, including olivine-type phosphate, layered manganate, and Prussian blue materials with open framework structures. Among many positive electrode materials, Prussian blue positive electrode materials have an open The material is transported rapidly, and has excellent rate performance and cycle stability. [0003] The typical preparation method of Prussian blue cathode material is to use the co-precipitation method to combine Na 4 Fe(CN) 6 P...

Claims

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Application Information

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IPC IPC(8): C01C3/12H01M4/58H01M10/054
CPCH01M4/58H01M10/054C01C3/12C01P2006/40Y02E60/10
Inventor 刘双宇徐丽陈新韩钰马光祝志祥王博刘海镇盛鹏赵广耀高洁
Owner GLOBAL ENERGY INTERCONNECTION RES INST CO LTD
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