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High-entropy Prussian blue material and preparation method thereof

Active Publication Date: 2021-11-23
ZHEJIANG UNIV HANGZHOU GLOBAL SCI & TECH INNOVATION CENT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] Therefore, the object of the present invention is to: solve the technical problems of short cycle life and poor rate performance when existing Prussian blue materials are used as positive electrode materials for sodium-ion batteries, It is proposed to provide a high-entropy Prussian blue-like sodium-ion battery cathode material and its preparation method

Method used

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  • High-entropy Prussian blue material and preparation method thereof
  • High-entropy Prussian blue material and preparation method thereof
  • High-entropy Prussian blue material and preparation method thereof

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Embodiment 1

[0048] This embodiment provides a method for preparing a high-entropy Prussian blue-like sodium-ion battery cathode material, comprising the following steps:

[0049] Dissolve 3 mol of sodium ferrocyanide decahydrate, 10 g of polyvinylpyrrolidone, and 2 mol of sodium citrate in a mixed solvent consisting of 1 L of deionized water and 100 mL of absolute ethanol to obtain a precursor solution A;

[0050]Dissolve 0.3 mol manganese sulfate, 0.3 mol copper sulfate, 0.3 mol nickel acetate, 0.3 mol cobalt chloride, 0.3 mol ferric nitrate and 2 mol sodium citrate in a mixed solvent composed of 1L deionized water and 100mL absolute ethanol to obtain a precursor solution B;

[0051] use figure 1 The device shown is for co-precipitation reaction, wherein container A contains precursor solution A, container B contains precursor solution B, and the precursor solution B is slowly dripped into container A at a rate of 1 mL / min through a silicone tube using a peristaltic pump , and the temp...

Embodiment 2

[0060] This embodiment provides a method for preparing a high-entropy Prussian blue-like sodium-ion battery cathode material, comprising the following steps:

[0061] 4mol sodium ferrocyanide decahydrate, 20g cetyltrimethylammonium bromide, and 1mol1-10-phenanthroline were dissolved in a mixed solvent composed of 1L deionized water and 300mL anhydrous n-butanol, Obtain precursor solution A;

[0062] Dissolve 0.4mol manganese chloride, 0.4mol copper oxalate, 0.4mol nickel acetate, 0.4mol ethylenediaminetetraacetic acid cobalt, 0.4mol ferric nitrate, 0.4mol titanium chloride and 1mol 1-10-phenanthroline in 1L deionized Precursor solution B is obtained in a mixed solvent composed of water;

[0063] use figure 1 The device shown is for co-precipitation reaction, wherein container A contains precursor solution A, container B contains precursor solution B, and the precursor solution B is slowly added dropwise to container A at a rate of 5 mL / min through a silicone tube using a per...

Embodiment 3

[0071] This embodiment provides a method for preparing a high-entropy Prussian blue-like sodium-ion battery cathode material, comprising the following steps:

[0072] Dissolve 1mol of sodium ferrocyanide decahydrate, 300g of sodium dodecylbenzenesulfonate, and 0.1mol of disodium edetate in a mixed solvent consisting of 1L of deionized water and 100mL of anhydrous methanol to obtain a precursor solution A;

[0073] Dissolve 0.2mol manganese sulfate, 0.1mol copper sulfate, 0.1mol nickel acetate, 0.2mol titanium chloride, 0.2mol vanadium chloride, 0.2mol chromium chloride and 0.001mol edetate disodium in 1L deionized water and Precursor solution B was obtained in a mixed solvent composed of 500mL absolute ethanol;

[0074] use figure 1 The device shown is for co-precipitation reaction, wherein container A contains precursor solution A, container B contains precursor solution B, and uses a peristaltic pump to slowly drop precursor solution B to container A at a rate of 50 mL / min...

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Abstract

The invention discloses a high-entropy Prussian blue material, and the molecular formula of the high-entropy Prussian blue material is NaxMIN[Fe(CN)6]zwH2O, wherein M is n different transition metal elements, n is greater than or equal to 5, yn is greater than or equal to 0.01 and less than or equal to 0.90, y1 + y2 + y3 + y4 + y5+... + yn = 1, w is less than or equal to 4.0, x is greater than or equal to 1.40 and less than or equal to 1.95, and z is greater than or equal to 0.90 and less than or equal to 0.98. The high-entropy Prussian blue material is of a monoclinic phase structure, the microstructure of the high-entropy Prussian blue material is large-size crystal particles, and the crystal particles are uniform in size, single in shape and regular in polyhedral morphology. The invention also provides application of the high-entropy Prussian blue material as a positive electrode material in a sodium-ion battery and a preparation method of the high-entropy Prussian blue material. A coprecipitation method is adopted, and the high-entropy Prussian blue material with high specific capacity, good rate capability and excellent cycle performance is obtained through selection of source materials, technological process design and selection and control of technological parameters in preparation.

Description

technical field [0001] The invention relates to the technical field of energy materials, in particular to a positive electrode material for a Prussian blue sodium-ion battery and a preparation method thereof. Background technique [0002] Due to the excessive use of fossil energy, environmental and energy problems have become more and more severe, such as the greenhouse effect, air pollution and energy depletion are gradually affecting human production and life. The emergence of new clean energy can alleviate the above-mentioned crisis to a great extent, so it has attracted the attention of researchers all over the world. However, new clean energy, represented by solar energy, tidal energy, wind energy and thermal energy, is severely limited by time and space conditions, and it is difficult to directly generate high-quality energy supply. Therefore, energy storage equipment is needed to solve the energy throughput problem. Among them, the development of large-scale and low-...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58H01M10/054H01M4/1397C01C3/12
CPCH01M4/58H01M10/054H01M4/1397C01C3/12Y02E60/10
Inventor 姜银珠黄瑶
Owner ZHEJIANG UNIV HANGZHOU GLOBAL SCI & TECH INNOVATION CENT
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