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A 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 high lattice vacancies and water content, poor crystallization integrity, poor cycle performance, etc., to reduce water content and The effects of vacancy content, good cycle stability, and complete crystallinity

Active Publication Date: 2022-06-07
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

[0005] But the existing Prussian blue complexes have the following deficiencies: 1) the crystallization integrity of the Prussian blue complexes prepared by the existing methods is not good, the sodium content is too low, and the vacancies and water content in the crystal lattice are partial. High, resulting in its actual specific capacity is far lower than the theoretical capacity, poor cycle performance, can not be applied to the full battery; 2) The powder materials prepared by the existing method are all Prussian blue complexes, which need to be used before assembling the battery After the slurry preparation and slurry coating process, the process is cumbersome, and the substances in the electrode are difficult to mix uniformly, resulting in insufficient mutual contact, and at the same time, impurities are introduced, which greatly affects the intrinsic properties of the Prussian blue complex.

Method used

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  • A method for preparing Prussian blue positive electrode material and sodium ion battery
  • A method for preparing Prussian blue positive electrode material and sodium ion battery
  • A method for preparing Prussian blue positive electrode material and sodium ion battery

Examples

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Embodiment 1

[0031] The precursor solution required for this implementation reaction is 0.01mol L-1 of Na4Fe (CN) 6 and FeCl2 aqueous solution. The specific steps are:

[0032] 1) Take a certain amount of sodium ferrocyanide decahydrate and ferrous chloride tetrahydrate, respectively, dissolved in deionized water with a small amount of ascorbic acid and kochen black, respectively, to form a precursor solution with a concentration of 0.01mol L-1;

[0033] 2) Before deposition, ultrasonically clean the substrate;

[0034]3) The two solutions flow to the spray head at a rate of 3mL h-1 at a uniform speed, the control substrate temperature is constant at 100 ° C, the distance from the adjustment needle to the substrate is 3cm, the DC voltage between the spray head and the substrate is 15kV, and a uniform and stable aerosol spray is obtained between the nozzle and the substrate, the spraying time is controlled for 200min, and the Prussian blue complex film material is obtained on the substrate

[0...

Embodiment 2

[0043] The preparation method of the present embodiment is the same as Example 1, but the reducing agent is sodium borohydride. The precursor solution required for the reaction is 0.01mol L-1 of Na4Fe (CN) 6 and MnCl2 aqueous solution. The specific steps are:

[0044] 1) Take a certain amount of sodium ferrocyanide decahydrate and manganese chloride tetrahydrate, respectively, dissolved in deionized water with a small amount of sodium borohydride and kochen black, respectively, to form a precursor solution with a concentration of 0.01mol L-1;

[0045] 2) Before deposition, ultrasonically clean the substrate;

[0046] 3) The two solutions flow to the spray head at a rate of 3mL h-1 at a uniform speed, the control substrate temperature is constant at 100 ° C, the distance from the adjustment needle to the substrate is 3cm, the DC voltage between the adjustment spray head and the substrate is 15kV, and a uniform and stable aerosol spray is obtained between the nozzle and the substrat...

Embodiment 3

[0049] The preparation method of the present embodiment is the same as Example 1, but the reducing agent is sodium borohydride. The precursor solution required for the reaction is 0.02mol L-1 of Na4Fe (CN) 6 and CoCl2 aqueous solution. The specific steps are:

[0050] 1) Take a certain amount of sodium ferrocyanide decahydrate and cobalt chloride hexahydrate, respectively, dissolved in deionized water with a small amount of sodium borohydride and kochen black, respectively, to form a precursor solution with a concentration of 0.02mol L-1;

[0051] 2) Before deposition, ultrasonically clean the substrate;

[0052]3) The two solutions flow to the spray head at a uniform speed of 4mL h-1, the control substrate temperature is constant at 140 ° C, the distance from the adjustment needle to the substrate is 4cm, the DC voltage between the spray head and the substrate is 17kV, and a uniform and stable aerosol spray is obtained between the spray head and the substrate, the control spray t...

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Abstract

The invention discloses a method for preparing Prussian blue cathode material and a sodium ion battery. The method comprises the following steps: (1), preparing a precursor solution with a concentration of 0.01 to 0.02 mol / L; (2), ultrasonically cleaning the substrate; (3), spraying and cleaning the substrate with the precursor solution, depositing and preparing Cathode material. The method regulates the thickness of the film by adjusting the spray time, and the prepared thin film positive electrode can be directly used in the assembly of sodium ion batteries without steps such as slurry coating, and the process is simple; the prepared thin film positive electrode does not contain other impurities and has better uniformity , the crystallinity is more complete, the water content and vacancy content are reduced, the sodium content of the material is increased, and it shows good cycle stability and high specific capacity when used as a cathode for a sodium ion battery.

Description

Technical field [0001] The present invention relates to a new material for energy storage, specifically to a method for preparing a Prussian blue cathode material and its use. Background [0002] Lithium-ion batteries are widely used in portable electronic devices and electric vehicles because of their excellent electrochemical properties and environmental friendliness. However, the lack of lithium resources has hindered the further development of lithium-ion batteries. The sodium element and lithium element belong to the same main group and adjacent in the periodic table, have similar physical and chemical properties, and the reserves of sodium in the earth's crust are abundant, reaching 2.3%-2.8%, and the corresponding sodium-ion battery key material cost is low, so the sodium-ion battery is considered to be the next generation of energy storage system that is expected to replace lithium-ion batteries. [0003] At present, sodium-ion batteries are still in the prototype device ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/58H01M10/054
CPCH01M4/58H01M10/054Y02E60/10
Inventor 刘双宇李慧徐丽陈新韩钰马光王博刘海镇盛鹏赵广耀
Owner GLOBAL ENERGY INTERCONNECTION RES INST CO LTD
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