Prussian blue positive electrode material, sodium ion battery and preparation method and application thereof

A sodium-ion battery and cathode material technology, applied in the direction of positive electrodes, battery electrodes, secondary batteries, etc., can solve problems such as poor cycle performance, imperfect crystal structure, and low capacity of sodium-ion batteries

Active Publication Date: 2020-07-07
浙江钠创新能源有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve defects such as imperfect crystal structure of Prussian blue materials in the prior art, low capacity and poor cycle performance when used as anode m

Method used

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  • Prussian blue positive electrode material, sodium ion battery and preparation method and application thereof
  • Prussian blue positive electrode material, sodium ion battery and preparation method and application thereof
  • Prussian blue positive electrode material, sodium ion battery and preparation method and application thereof

Examples

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Effect test

Embodiment 1

[0046] Preparation of Prussian blue positive electrode material sodium ferrocyanide manganese:

[0047] (1) Weigh 0.01 mol of disodium manganese edetate and sodium ferrocyanide and dissolve them in 200mL of deionized water to prepare solution A, wherein disodium manganese edetate and ferrocyanide The concentration of sodium is 0.05mol / L;

[0048] (2) Weigh 0.02mol ascorbic acid, dissolve it in 100mL deionized water, and prepare solution B, wherein the concentration of ascorbic acid is 0.2mol / L;

[0049] (3) Place solution A on a magnetic stirrer and stir, and use a peristaltic pump to add solution B dropwise to solution A stirred at high speed. During the dropping process, white precipitates are formed, and the dropping time is about 3.5 hours. mixture;

[0050] (4) Continue to stir the mixed solution at room temperature for 0.5h and then let it stand for 6h;

[0051] (5) Centrifuge the mixed solution after standing to obtain a white precipitate, and dry the white precipita...

Embodiment 2

[0053] Preparation of Prussian blue positive electrode material sodium ferrocyanide manganese:

[0054] Step (2) Weigh 0.05 mol of sodium dihydrogen phosphate, dissolve it in 100 mL of deionized water, and prepare solution B, wherein the concentration of sodium dihydrogen phosphate is 0.5 mol / L. The rest of the steps were the same as in Example 1 to obtain sodium manganese ferrocyanide, a positive electrode material of Prussian blue type. The content of each element was measured by inductively coupled plasma emission spectrometer (ICP-AES), and its molecular formula was calculated as Na 1.88 Mn[Fe(CN) 6 ] 0.97 1.3H 2 O.

Embodiment 3

[0056] Preparation of Prussian blue positive electrode material cobalt ferrocyanide sodium:

[0057] The disodium manganese EDTA in Example 1 was replaced with disodium cobalt EDTA, and the rest of the steps were the same as in Example 1 to obtain the Prussian blue positive electrode material sodium manganese ferrocyanide. The content of each element was measured by inductively coupled plasma emission spectrometer (ICP-AES), and its molecular formula was calculated as Na 1.88 Co[Fe(CN) 6 ] 0.97 1.1H 2 O.

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Abstract

The invention discloses a prussian blue positive electrode material, a sodium ion battery, and a preparation method and application thereof. The molecular formula of the prussian blue positive electrode material is NaxM [Fe (CN) 6] y.nH2O, wherein M is transition metal, x is less than or equal to 2 and greater than or equal to 1.8; y is less than or equal to 1 and greater than or equal to 0.95; and n is less than or equal to 2 and greater than or equal to 0. The prussian blue positive electrode material has low lattice defect and stable performance; and the sodium ion battery prepared from thematerial is high in capacity and good in cycle performance. The preparation method comprises the following steps of: S1, adding an aqueous solution of weak acid into an aqueous solution of sodium ferrocyanide and transition metal ethylenediamine tetraacetic acid sodium salt to obtain a precipitate; and S2, drying the precipitate. The preparation method can be adopted to control the crystallization speed, and has advantages of simple process, low production cost, non-toxicity, harmlessness and short production period.

Description

technical field [0001] The invention relates to a Prussian blue positive electrode material, a sodium ion battery and a preparation method and application thereof. Background technique [0002] With the continuous expansion of the global demand for large-scale energy storage, the resource-rich and environmentally friendly sodium-ion battery technology has become a research hotspot. The key to the development of sodium-ion batteries is to seek and develop high-capacity electrode materials with fast sodium intercalation and desorption capabilities. Prussian blue materials have a wide source of raw materials, simple preparation, and a theoretical capacity of up to 170mAh / g, which has a good application prospect. This material was first reported by Goodenough's research group and then studied in depth. [0003] Prussian blue materials are generally prepared by liquid phase precipitation. The existing liquid phase precipitation method is to combine easily ionized transition met...

Claims

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Application Information

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IPC IPC(8): C01C3/12H01M4/58H01M10/054
CPCC01C3/12H01M4/58H01M10/054H01M2004/028Y02E60/10
Inventor 彭方威马紫峰廖小珍袁思齐车海英王红廖建平
Owner 浙江钠创新能源有限公司
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