Preparation method of Prussian blue based sodium ion battery positive electrode material

A technology of sodium ion battery and Prussian blue is applied in the field of preparation of positive electrode material of Prussian blue-based sodium ion battery, which can solve the problems of large sodium atomic weight and low chemical potential, and achieve the effects of simple preparation process, good stability and reduction of defects.

Inactive Publication Date: 2017-05-10
DONGGUAN JIAQIAN NEW MATERIAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the atomic weight of sodium is larger than that of lithium, and the standard electrochemical potential is lower than that of lithium. The energy density of current sodium-ion batteries is still difficult to match that of lithium-ion batteries, and research on sodium-ion battery systems is still needed.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] A preparation method of Prussian blue-based sodium ion battery cathode material, comprising the following steps:

[0021] (1) After mixing ferrous oxalate and sodium oxalate evenly, add a surfactant to the solution and water, stir it ultrasonically, and after defoaming, use a peristaltic pump to add the aqueous solution of sodium ferrocyanide dropwise into it. , stirred at a speed of 120rpm, after the dropwise addition, continued to stir for 36h to obtain a blue precipitate, which was centrifugally washed with deionized water for several times, washed twice with absolute ethanol, and then vacuum-dried to obtain Prussian blue;

[0022] (2) After mixing the prepared Prussian blue and the conductive agent, place it in a marble grinder jar, add deionized water to it, add zirconium dioxide grinding balls, rotate at a speed of 200rpm, and dry the prepared powder , dispersed in absolute ethanol, added dropwise with a binder, mixed uniformly, dried in vacuum, and pressed into ...

Embodiment 2

[0025] A preparation method of Prussian blue-based sodium ion battery cathode material, comprising the following steps:

[0026] (1) After mixing ferrous oxalate and sodium oxalate evenly, add a surfactant to the solution and water, stir it ultrasonically, and after defoaming, use a peristaltic pump to add the aqueous solution of sodium ferrocyanide dropwise into it. , stirred at a speed of 300rpm, after the dropwise addition, continued to stir for 48h to obtain a blue precipitate, which was centrifugally washed with deionized water for several times, washed 3 times with absolute ethanol, and then vacuum-dried to obtain Prussian blue;

[0027] (2) After mixing the prepared Prussian blue and the conductive agent, place it in a marble grinding tank, add deionized water therein, add zirconia grinding balls, rotate at a speed of 450rpm, and dry the obtained powder , dispersed in absolute ethanol, added dropwise with a binder, mixed uniformly, dried in vacuum, and pressed into tab...

Embodiment 3

[0030] A preparation method of Prussian blue-based sodium ion battery cathode material, comprising the following steps:

[0031] (1) After mixing ferrous oxalate and sodium oxalate evenly, add a surfactant to the solution and water, stir it ultrasonically, and after defoaming, use a peristaltic pump to add the aqueous solution of sodium ferrocyanide dropwise into it. , stirred at a speed of 200rpm, after the dropwise addition, continued to stir for 40h to obtain a blue precipitate, which was centrifugally washed with deionized water for several times, washed twice with absolute ethanol, and then vacuum-dried to obtain Prussian blue;

[0032] (2) After mixing the prepared Prussian blue and the conductive agent, place it in a marble grinder tank, add deionized water to it, add zirconia grinding balls, rotate at a speed of 350rpm, and dry the prepared powder , dispersed in absolute ethanol, added dropwise with a binder, mixed uniformly, dried in vacuum, and pressed into tablets,...

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Abstract

The invention discloses a preparation method of a Prussian blue based sodium ion battery positive electrode material. The preparation method takes ferrous oxalate and sodium oxalate as raw materials, and makes the raw materials react with sodium ferrocyanide; a reaction speed can be slower and the production speed of a Prussian blue mono-crystal becomes slow, so that the aim of reducing defects in a Prussian blue crystal is realized. A sodium ion battery positive electrode prepared from the Prussian blue crystal can still keep good stability after being subjected to a plurality of times of charge-discharge cycles, and the service life is long. The method is simple in preparation process, easy to implement and suitable for large-scale production.

Description

technical field [0001] The invention relates to the field of batteries, in particular to a preparation method of a positive electrode material for a Prussian blue-based sodium ion battery. Background technique [0002] With the rapid development of large-scale smart grids and the popularization and application of electric vehicles, lithium resources cannot meet the huge demand of lithium-ion batteries, so it is necessary to develop energy storage technologies that can replace lithium-ion batteries. Sodium is abundant in the earth's crust and widely distributed. It belongs to the same group of elements as lithium, and is a feasible battery raw material to replace lithium. However, the atomic weight of sodium is larger than that of lithium, and the standard electrochemical potential is lower than that of lithium. The energy density of current sodium-ion batteries is still difficult to match that of lithium-ion batteries, and research on sodium-ion battery systems is still need...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58H01M10/054C01C3/12
CPCC01C3/12H01M4/58H01M10/054Y02E60/10
Inventor 王海燕
Owner DONGGUAN JIAQIAN NEW MATERIAL TECH CO LTD
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