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A kind of preparation method of nano microsphere phosphotungstate/sulfur cathode material

A technology of microsphere phosphotungstate and sulfur cathode material, applied in battery electrodes, structural parts, electrical components, etc., to achieve the effect of safe reaction conditions, simple preparation process and strong chemical adsorption

Active Publication Date: 2019-12-17
INST OF APPLIED CHEM JIANGXI ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is, in order to solve some inherent defects in lithium-sulfur batteries, the present invention proposes a preparation method of nano-microsphere phosphotungstate / sulfur cathode material

Method used

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  • A kind of preparation method of nano microsphere phosphotungstate/sulfur cathode material
  • A kind of preparation method of nano microsphere phosphotungstate/sulfur cathode material
  • A kind of preparation method of nano microsphere phosphotungstate/sulfur cathode material

Examples

Experimental program
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Effect test

Embodiment 1

[0026] Preparation of nano-microsphere potassium phosphotungstate / sulfur cathode material and electrode sheet:

[0027] (1) Preparation of nano-microsphere potassium phosphotungstic acid: take 50ml, 0.19mol / L potassium chloride solution, slowly add potassium chloride solution into 100ml, 0.09mol / L phosphotungstic acid solution, and the reaction temperature is 50°C, magnetic stirring speed 500r / min. The reaction time is 4h. Cool to room temperature after the reaction, wash and dry. Potassium phosphotungstate was prepared with nanometer microspheres. Its scanning electron microscope image is shown in figure 2 .

[0028] (2) Preparation of nano-microsphere potassium phosphotungstate / sulfur composites. Weigh 0.6g of nano-microsphere potassium phosphotungstate and 1.4g of elemental sulfur, put them into an agate ball mill jar, fill the agate ball mill jar with high-purity argon in the glove box and place it on a planetary ball mill for 1 hour. The speed is 300 r / min. Then, ...

Embodiment 2

[0032] Preparation of nano-microsphere ammonium phosphotungstate / sulfur cathode material and electrode sheet:

[0033] The potassium chloride solution in step (1) in Example 1 was replaced with ammonium chloride solution, and the reaction time of (1) in Example 1 was replaced from 4h to 8h. In the step (2) of Example 1, the nano-microsphere potassium phosphotungstate was replaced by the nano-microsphere ammonium phosphotungstate, and the others were the same as in Example 1. Under different current densities such as 160mA / g, 320mA / g, 800mA / g, 1600mA / g, 3200mA / g, 8000mA / g, etc., the ladder discharge test results are as follows Figure 4 shown.

Embodiment 3

[0035] Preparation of nano-microsphere cesium phosphotungstate / sulfur cathode material:

[0036] Replace the potassium chloride solution in step (1) in Example 1 with cesium chloride solution, replace the reaction temperature in (1) in Example 1 with 50°C to 60°C, and react (1) in Example 1 The time is 4h replaced by 8h. In the step (2) of Example 1, the nano-microsphere potassium phosphotungstate was replaced by the nano-microsphere cesium phosphotungstate, and the others were the same as in Example 1. Under the current density of 1600mA / g, the test results of charge and discharge cycle life are as follows: Figure 5 shown.

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Abstract

The invention provides a preparation method of a nanosphere phosphowolframate / sulfur cathode material. The cathode material is obtained by mixing a nanosphere phosphowolframate / sulfur composite material, a conductive agent and a binder according to a certain mass ratio, adding the mixture into a dispersing agent, fully stirring and making the mixture uniform, and coating and drying the mixture and then an electrode slice is prepared. The preparation method comprises the following steps: step 1), preparation of the nanosphere phosphowolframate: mixing an inorganic salt solution with a phosphotungstic acid aqueous solution, and obtaining a solid phase nanosphere phosphowolframate material; step 2), preparation of the nanosphere phosphowolframate / sulfur composite material: mixing the nanosphere phosphowolframate with sublimed sulfur or sulphur powder according to a certain mass ratio, ball milling uniformly, and after that, carrying out heat treatment and then the nanosphere phosphowolframate / sulfur composite material is prepared; and step 3), preparation of an electrode material: mixing and dispersing the nanosphere phosphowolframate / sulfur cathode material, the conductive agent and the binder into a solvent, stirring evenly, coating the slice, and drying the slice for standby. The preparation method of the nanosphere phosphowolframate / sulfur cathode material provided by the invention has the advantages of being low in cost, and capable of realizing large scale production and so on.

Description

technical field [0001] The invention relates to a preparation method of a nano-microsphere phosphotungstate / sulfur cathode material, which belongs to the technical field of lithium batteries. Background technique [0002] The global environmental pollution is serious, and the shortage of fossil energy supply has been restricting the rapid development of human beings. It is imminent to seek renewable and clean energy. Clean energy such as solar energy and wind energy needs to be converted into electrochemical energy to be effectively used by humans. These electrochemical energy need to be stored by electrochemical energy storage devices with high reliability, low price, large storage capacity, and relatively friendly environment. In recent years, the rapid development of industries such as electric vehicles and portable electronic devices has also put forward higher requirements for the energy density of secondary batteries. Lithium-sulfur battery is a battery system with h...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/052
CPCH01M4/362H01M4/38H01M4/62H01M10/052Y02E60/10
Inventor 晏南富崔红敏石劲松柳跃伟翁雅青尹敬群
Owner INST OF APPLIED CHEM JIANGXI ACAD OF SCI
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