Method for preparing micro-nano structure Prussian blue sodium battery positive electrode material through ultrasonic spray pyrolysis

A technology of Prussian blue and positive electrode materials, which is applied in the field of preparing micro-nano-structured sodium-ion battery positive electrode materials, can solve the problems of reduced tap density of electrode materials, unfavorable practical application, increased specific surface area of ​​solid electrolyte membrane membrane, etc., and meets equipment requirements The effect of low, high tap density and simple process

Inactive Publication Date: 2021-05-28
SHENGJIAN NO 83 FACTORY SHANDONG PROV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although there are various preparation methods, most of the preparation methods can only solve the problem of nanoparticle preparation, and it is difficult to control the further assembly of nanoparticles.
In fact, nanonization is still a double-edged sword, and there are some disadvantages that cannot be ignored: 1) It leads to a decrease in the tap density of electrode materials, which is not conducive to practical applications; 2) Increasing the specific surface area of ​​electrode materials leads to an increase in the membrane area of ​​the solid electrolyte membrane (SEI). , reducing the Coulombic efficiency and cycle life of the electrode material

Method used

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  • Method for preparing micro-nano structure Prussian blue sodium battery positive electrode material through ultrasonic spray pyrolysis
  • Method for preparing micro-nano structure Prussian blue sodium battery positive electrode material through ultrasonic spray pyrolysis
  • Method for preparing micro-nano structure Prussian blue sodium battery positive electrode material through ultrasonic spray pyrolysis

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] In this example, uniformly mixed LiOH and electrode materials of equal mass are used for spray pyrolysis at 250°C. The specific operation steps are as follows:

[0030] (1) Precursor dispersion preparation: First prepare a certain concentration of CoCl 2 and Na 4 Fe(CN) 6 , and then slowly mix the two solutions. After a period of reaction, precipitation will occur. Wash the precipitation with water and ethanol three times, and then redisperse it in the aqueous solution.

[0031] (2) Ultrasonic spray pyrolysis: add an equal mass of LiOH to the dispersion prepared in step (1), put the suspension in an ultrasonic atomizer after dissolution, and then pass the atomized solution into the preheating Pyrolysis was performed in a tube furnace at 250°C, and powder samples were finally collected. Soak in deionized water for 1 hour, filter, then rinse with deionized water until neutral, and dry to obtain the required electrode material.

[0032] Adopt scanning electron microsco...

Embodiment 2

[0034] In this example, uniformly mixed KOH and electrode materials of equal mass are used for spray pyrolysis at 250°C. The specific operation steps are as follows:

[0035] (1) Precursor dispersion preparation: First prepare a certain concentration of CoCl 2 and Na 4 Fe(CN) 6 , and then slowly mix the two solutions. After a period of reaction, precipitation will occur. Wash the precipitation with water and ethanol three times, and then redisperse it in the aqueous solution.

[0036] (2) Ultrasonic spray pyrolysis: Add an equal mass of KOH to the dispersion prepared in step (1), put the suspension in an ultrasonic atomizer after dissolving, and then pass the atomized solution into the preheating Pyrolysis was performed in a tube furnace at 250°C, and powder samples were finally collected. Soak in deionized water for 1 hour, filter, then rinse with deionized water until neutral, and dry to obtain the required electrode material.

[0037] Adopt scanning electron microscope ...

Embodiment 3

[0039] This embodiment utilizes the Na of equal mass uniformly mixed 2 CO 3 And electrode material spray pyrolysis at 250 ℃, the specific operation steps are as follows:

[0040] (1) Precursor dispersion preparation: First prepare a certain concentration of CoCl 2 and Na 4 Fe(CN) 6 , and then slowly mix the two solutions. After a period of reaction, precipitation will occur. Wash the precipitation with water and ethanol three times, and then redisperse it in the aqueous solution.

[0041] (2) Ultrasonic spray pyrolysis: add an equal mass of Na to the dispersion prepared in step (1) 2 CO 3, after being dissolved, the suspension was placed in an ultrasonic atomizer, and then the atomized solution was passed into a tube furnace preheated to 250°C for pyrolysis, and finally the powder sample was collected. Soak in deionized water for 1 hour, filter, then rinse with deionized water until neutral, and dry to obtain the required electrode material.

[0042] Adopt scanning elec...

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Abstract

The invention provides a method for preparing a micro-nano structure Prussian blue sodium ion battery positive electrode material through ultrasonic spray pyrolysis. The method particularly relates to the following process: (1) preparation of a precursor: firstly preparing a nano-particle morphology electrode material by using a precipitation method, mixing the nano-particle morphology electrode material with deionized water, stirring, standing, filtering and re-dispersing the nano-particle morphology electrode material into the deionized water; and (2) ultrasonic spray pyrolysis: mixing the suspension prepared in the step (1) with LiOH, KOH, Na2CO3 and the like), putting the mixture into an ultrasonic atomizer, introducing the atomized solution into a high-temperature tubular furnace (heating to a target temperature of 200-400 DEG C), and collecting a product, thereby preparing the mesoporous spherical electrode material which has a proper specific surface area and is relatively uniform in size distribution and consists of nanoparticles. The preparation method disclosed by the invention is simple, low in raw material price and suitable for industrial production.

Description

technical field [0001] The invention relates to a method for preparing anode material of a sodium-ion battery with a micro-nano structure, belonging to the technical field of battery material preparation. Background technique [0002] Research on sodium-ion batteries began around the 1970s, almost at the same time as lithium-ion batteries. Although lithium and sodium are both alkali metal elements and have many similar physical and chemical properties, the development of sodium-ion batteries has been relatively slow. This is mainly due to the fact that the radius of Na ions (97 pm) is much larger than that of Li ions (68 pm), resulting in fewer electrode materials suitable for intercalation / extraction of Na ions, and most electrode materials exhibit poor kinetic performance, which limits the potential of Na ions. Selection of electrode materials for ion batteries and performance of batteries. To solve the above problems, a breakthrough must be made in the research of elect...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58H01M10/054
CPCH01M4/58H01M10/054H01M2004/028H01M2004/021Y02E60/10
Inventor 金兴会张晋陈维宪刘炳强赵修富崔振华唐永贵张俊邱萌黄震
Owner SHENGJIAN NO 83 FACTORY SHANDONG PROV
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