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

A cathode material, Prussian blue technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of high lattice vacancy and water content, poor crystal integrity, poor cycle performance, etc., to reduce water content and Effects of vacancy content, good cycle stability, and complete crystallinity

Active Publication Date: 2019-04-09
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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  • 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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Embodiment 1

[0031] The precursor solution required for this reaction is 0.01 mol L-1 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, and dissolve them in deionized water added with a small amount of ascorbic acid and Ketjen 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) Flow the two solutions to the spray head at a constant speed of 3mL h-1, control the temperature of the substrate at 100°C, adjust the distance from the needle to the substrate to 3cm, and adjust the DC voltage between the spray head and the substrate to 15kV, Obtain uniform and stable aerosol spray between the nozzle and the substrate, control the spray time to 200min, and obtain the Prussian blue complex film material on the substrate

[0035] Result detection:

[0036] 1. Adopt powde...

Embodiment 2

[0043] The preparation method of this embodiment is the same as that of Example 1, but the reducing agent is sodium borohydride. Wherein the precursor solution required for the reaction is 0.01mol L-1 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, and dissolve them in deionized water with a small amount of sodium borohydride and Ketjen 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) Flow the two solutions to the spray head at a constant speed of 3mL h-1, control the temperature of the substrate at 100°C, adjust the distance from the needle to the substrate to 3cm, and adjust the DC voltage between the spray head and the substrate to 15kV, A uniform and stable aerosol spray is obtained between the nozzle and the substrate, and the sprayin...

Embodiment 3

[0049] The preparation method of this embodiment is the same as that of Example 1, but the reducing agent is sodium borohydride. Wherein the precursor solution required for the reaction is 0.02mol L-1 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, and dissolve them in deionized water with a small amount of sodium borohydride and Ketjen 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) Flow the two solutions to the spray head at a constant speed of 4mL h-1, control the temperature of the substrate at 140°C, adjust the distance from the needle to the substrate to 4cm, and adjust the DC voltage between the spray head and the substrate to 17kV, A uniform and stable aerosol spray is obtained between the nozzle and the substrate, and the spray time ...

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Abstract

The invention discloses a method for preparing Prussian blue positive electrode material and a sodium ion battery. The method comprises the following steps of (1) preparing a precursor solution with concentration being (0.01-0.02)mol / L; (2) performing ultrasonic cleaning on a substrate; and (3) atomizing the cleaned substrate by the precursor solution, and performing deposition to prepare the positive electrode material. According to the method, the thickness of a thin film is adjusted by adjusting the atomizing time, the prepared thin film positive electrode can be directly used for assemblyof the sodium ion battery without the step of pasting, and the process is simple; the prepared thin film positive electrode does not contain other impurity, is more excellent in uniformity and more complete in crystallinity, the water content and the vacancy content are reduced, the sodium content of the material is improved, and favorable cycle stability and high specific capacity are shown whenthe thin film positive electrode is used as a positive electrode of the sodium ion battery.

Description

technical field [0001] The invention relates to a new energy storage material, in particular to a method for preparing a Prussian blue positive electrode material and its application. Background technique [0002] Lithium-ion batteries have been widely used in portable electronic devices and electric vehicles due to their excellent electrochemical performance and environmental friendliness. However, the shortage of lithium resources hinders the further development of lithium-ion batteries. The sodium element and lithium element belong to the same main group and are adjacent to each other in the periodic table, and have similar physical and chemical properties, and the sodium element reserves in the earth's crust are abundant, reaching 2.3%-2.8%, and the corresponding key material cost of sodium-ion batteries is relatively low. , So Na-ion batteries are considered to be the next-generation energy storage system that is expected to replace Li-ion batteries. [0003] At prese...

Claims

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Application Information

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Patent Type & Authority Applications(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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