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In-situ powder coating and pole plate preparation integrated method for lithium-sulfur batteries

A lithium-sulfur battery, in-situ technology, applied in battery electrodes, secondary batteries, electrochemical generators, etc., can solve the problems of complicated and cumbersome process, long preparation cycle, low production efficiency, etc., and achieve simple process flow and preparation cycle. Short, productive results

Active Publication Date: 2017-12-22
HENAN NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above-mentioned technical solutions are to first prepare the positive electrode material powder coated with polydopamine film, then make the positive electrode material powder into a slurry, and then prepare the electrode sheet. The process is complicated and cumbersome, the preparation cycle is long, the production efficiency is low, and the cost is high.

Method used

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  • In-situ powder coating and pole plate preparation integrated method for lithium-sulfur batteries
  • In-situ powder coating and pole plate preparation integrated method for lithium-sulfur batteries
  • In-situ powder coating and pole plate preparation integrated method for lithium-sulfur batteries

Examples

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Embodiment 1

[0041] This example is used in the integrated method of in-situ powder coating and electrode plate preparation for lithium-sulfur batteries (flow chart as shown in figure 1 shown), including the following steps:

[0042] 1) According to the volume ratio of absolute ethanol and deionized water of 1:2, mix absolute ethanol and water; under stirring conditions, add ammonia water drop by drop to the above system, and adjust the pH value of the system to 8.5 (detect with a pH meter) to obtain a mixed solution;

[0043] 2) Take elemental sulfur (positive electrode active material) and add it to the mixed solution obtained in step 1) (so that the concentration of elemental sulfur is 0.1g / ml), and ultrasonically disperse it for 30 minutes; then, the mass ratio of elemental sulfur to dopamine hydrochloride is 98 :2 ratio, add dopamine hydrochloride, continue to stir 2h, get suspension;

[0044] 3) Place the suspension obtained in step 2) in a blast drying oven at 80°C for 30 minutes ...

Embodiment 2

[0051] This embodiment is used for the integrated method of in-situ powder coating and electrode plate preparation for lithium-sulfur batteries, including the following steps:

[0052] 1) According to the volume ratio of absolute ethanol and deionized water of 1:2, mix absolute ethanol and water; under stirring conditions, add ammonia water drop by drop to the above system, and adjust the pH value of the system to 8.5 (detect with a pH meter) to obtain a mixed solution;

[0053] 2) Take elemental sulfur (positive electrode active material) and add it to the mixed solution obtained in step 1) (so that the concentration of elemental sulfur is 0.1g / ml), and ultrasonically disperse it for 30 minutes; then, the mass ratio of elemental sulfur to dopamine hydrochloride is 96 : The ratio of 4, add dopamine hydrochloride, continue to stir 2h, get suspension;

[0054] 3) Place the suspension obtained in step 2) in a blast drying oven at 80°C for 30 minutes to make the ammonia gas fully...

Embodiment 3

[0060] This embodiment is used for the integrated method of in-situ powder coating and electrode plate preparation for lithium-sulfur batteries, including the following steps:

[0061] 1) According to the volume ratio of absolute ethanol and deionized water of 1:2, mix absolute ethanol and water; under stirring conditions, add ammonia water drop by drop to the above system, and adjust the pH value of the system to 8.5 (detect with a pH meter) to obtain a mixed solution;

[0062] 2) Take elemental sulfur (positive electrode active material) and add it to the mixed solution obtained in step 1) (so that the concentration of elemental sulfur is 0.1g / ml), and ultrasonically disperse it for 30 minutes; then, the mass ratio of elemental sulfur to dopamine hydrochloride is 94 :6 ratio, add dopamine hydrochloride, continue to stir 2h, get suspension;

[0063] 3) Place the suspension obtained in step 2) in a blast drying oven at 80°C for 30 minutes to make the ammonia gas fully volatil...

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Abstract

The invention relates to an in-situ powder coating and pole plate preparation integrated method for lithium-sulfur batteries. The method includes: mixing an organic solvent with water, then adjusting the pH value to 8.5 with ammonia water to obtain a mixed solution; dispersing a positive active material and dopamine hydrochloride in the obtained mixed solution to obtain a suspension; heating the obtained suspension to fully volatilize ammonia, and adding a conductive agent and a binder to make a positive slurry; coating a positive current collector with the positive slurry, and performing drying to obtain a positive pole plate. The preparation method realizes integration of positive material powder coating and pole plate preparation, shortens the technological process and the preparation period, and lowers the production cost. Auto polymerization reaction is carried out on dopamine in a weak alkaline environment to form polydopamine, the good film-forming properties of polydopamine are utilized to coat the positive active material so as to improve the cycling stability of lithium-sulfur batteries. The method has the advantages of simple technological process and high production efficiency, and is suitable for large-scale industrial production.

Description

technical field [0001] The invention belongs to the technical field of lithium-sulfur batteries, and in particular relates to an integrated method for in-situ powder coating and electrode plate preparation for lithium-sulfur batteries. Background technique [0002] With the rapid development of society and economy, our lives are also undergoing rapid changes. Portable electrical appliances and power supplies are gradually entering our lives. The energy requirements of these electronic products make high specific energy storage devices more and more important. As a new type of secondary battery, lithium-ion battery is recognized as one of the most potential energy storage systems. However, due to the relatively low specific energy and high price of commercial lithium-ion batteries, they do not meet people's needs. Therefore, the development of next-generation energy storage devices with high energy, low price, long life, and safety has become the focus of extensive research...

Claims

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Application Information

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IPC IPC(8): H01M4/139H01M4/36H01M4/38H01M4/62H01M10/0525
CPCH01M4/139H01M4/366H01M4/38H01M4/624H01M4/628H01M10/0525Y02E60/10
Inventor 曹朝霞张俊董红玉张会双尹艳红杨书廷
Owner HENAN NORMAL UNIV
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