Method for preparing Prussian blue positive electrode material, and sodium ion battery

A positive electrode material, Prussian blue technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of low specific capacity and inability to effectively solve the problem of synthesis of high-sodium Prussian blue materials, and achieve high specific capacity and small polarization , a high degree of practicality

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

AI Technical Summary

Problems solved by technology

[0004] Prussian blue is a positive electrode material for sodium-ion batteries with an open framework structure, and Na 2-x m y Fe(CN) 6 structure, but it is still unable to effectively solve the synthesis problem of high-sodium Prussian blue materials, and the specific capacity is generally low

Method used

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  • Method for preparing Prussian blue positive electrode material, and sodium ion battery
  • Method for preparing Prussian blue positive electrode material, and sodium ion battery
  • Method for preparing Prussian blue positive electrode material, and sodium ion battery

Examples

Experimental program
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Effect test

Embodiment 1

[0026] Preparation of Prussian blue cathode material:

[0027] (1) 0.08mol of Na 4 Fe(CN) 6 10H 2 O was dissolved in 200ml deionized water, named solution ①; 0.16mol MnCl 4H 2 O and 0.4 mol of NaCl were dissolved in 200ml of deionized water, and the pH of the solution was adjusted with sodium dihydrogen phosphate to keep it at 6-7, named as solution ②. Heat No. ② solution to 90°C, slowly drop No. ① solution into No. ② solution with a peristaltic pump, and keep it warm for 4 hours;

[0028] (2) Suction filtration, vacuum drying at 100°C for 24 hours, 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) 0.08mol of Na 4 Fe(CN) 6 10H 2 O was dissolved in 200ml deionized water, named solution ①; 0.16mol MnCl 4H 2 O and 0.8 mol of NaCl were dissolved in 200ml of deionized water, and the pH of the solution was adjusted with sodium dihydrogen phosphate to keep it at 6-7, named as solution ②. Heat No. ② solution to 90°C, slowly drip No. ① solution into No. ② solution with a peristaltic pump, and keep warm for 4 hours;

[0034] (2) Suction filtration, vacuum drying at 100°C for 24 hours, the molecular formula is Na 1.8 mn 0.4 Fe(CN) 6 Prussian blue cathode material.

[0035] Preparation of Na-ion battery:

[0036] 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

[0038] Preparation of Prussian blue cathode material:

[0039] (1) 0.08mol of Na 4 Fe(CN) 6 10H 2 O was dissolved in 200ml deionized water, named solution ①; 0.16mol MnCl 4H 2 O and 0.4 mol of NaCl were dissolved in 200ml of deionized water, and the pH of the solution was adjusted with sodium bicarbonate to keep it at 6-7, named as solution ②. Heat No. ② solution to 90°C, slowly drop No. ① solution into No. ② solution with a peristaltic pump, and keep warm for 4 hours

[0040] (2) Suction filtration, vacuum drying at 100°C for 24 hours, the molecular formula is Na 1.8 mn 0.4 Fe(CN) 6 Prussian blue cathode material.

[0041] Preparation of Na-ion battery:

[0042] 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 method for preparing a Prussian blue positive electrode material, and a sodium ion battery, wherein the molecular formula of the Prussian blue positive electrode material is Na2-xMyFe(CN)6, x is more than o 0 and is less than 2, y is more than 0 and is less than 1, and M is a transition metal. The preparation method comprises: adding a Na4Fe(CN)6 solution into a solution 2 containing the salt solution of M, a sodium salt and a pH value adjusting agent in a dropwise manner, maintain the pH value of the mixed solution at 6-7, and heating for a certain time in a protection atmosphere to obtain the Prussian blue positive electrode material. According to the present invention, the method has characteristics of simple process, easy control and continuous and scale production, and can be used for preparing the high sodium content Prussian blue positive electrode material; and the prepared Prussian blue positive electrode material as the sodium ion battery positive electrode material can improve the specific capacity of the battery, can reduce the polarization in the battery charging and discharging process, and has wide application prospects in the field of electric energy storage in the power grid.

Description

technical field [0001] The invention relates to a new energy storage material, in particular to a method for preparing a Prussian blue cathode material by adjusting pH and its application. Background technique [0002] Electric vehicles, smart grids, and energy Internet are profoundly affecting the development of human society and the ways of energy generation, acquisition, and utilization, and energy storage technology is the key supporting technology. The focus of energy researchers is to develop low-cost, high-performance energy storage technologies. Because the sodium element reserves are abundant in the earth's crust, reaching 2.3%-2.8%, and the cost of the key materials of the corresponding sodium-ion battery is relatively low, so the sodium-ion battery is considered to be one of the technologies that are expected to be used for large-scale energy storage in the next generation. [0003] At present, sodium-ion batteries are still in the stage of prototype device devel...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01C3/12H01M4/58H01M10/054
CPCC01C3/12C01P2006/40H01M4/58H01M10/054Y02E60/10
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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