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Lithium-sulfur battery binder, preparation method thereof, cathode slurry and preparation method thereof

A lithium-sulfur battery and positive electrode slurry technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of easy shuttle, poor battery cycle performance, easy dissolution, etc., and achieve the goal of improving easy dissolution and improving battery cycle performance Effect

Active Publication Date: 2019-05-24
桑德新能源技术开发有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The main purpose of the present invention is to provide a lithium-sulfur battery binder and its preparation method, positive electrode slurry and its preparation method, to solve the problem of lithium-sulfur batteries in the prior art due to the easy dissolution and shuttle of polysulfides. poor performance problem

Method used

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  • Lithium-sulfur battery binder, preparation method thereof, cathode slurry and preparation method thereof
  • Lithium-sulfur battery binder, preparation method thereof, cathode slurry and preparation method thereof
  • Lithium-sulfur battery binder, preparation method thereof, cathode slurry and preparation method thereof

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preparation example Construction

[0036] According to another aspect of the present invention, a kind of preparation method of above-mentioned binder is provided, and it comprises the following steps: mixing carboxymethyl cellulose, polyethyleneimine, cross-linking agent and solvent to obtain raw material mixed liquid; The mixed solution undergoes a cross-linking reaction to obtain a lithium-sulfur battery binder. The binder prepared by the method contains a three-dimensional network macromolecule formed by a crosslinking reaction of carboxymethyl cellulose and polyethyleneimine under the action of a crosslinking agent. This three-dimensional network macromolecular skeleton can bind polysulfides, and the many polar groups (such as amino groups) carried on the molecules can also adsorb polysulfides, preventing them from dissolving in the electrolyte and avoiding other A shuttle effect occurs into the negative terminal of the battery. For the above reasons, the binder provided by the present invention can effec...

Embodiment 1

[0052] Take 20g of distilled water, add 1g of carboxymethyl cellulose (CMC, average relative molecular weight 800~1200), and obtain a uniform CMC aqueous solution after mechanical stirring; then continue to add 1g of polyethyleneimine with a mass concentration of 30% to the CMC aqueous solution (PEI, weight-average molecular mass 3000-3500) aqueous solution, mechanically stirred to obtain a uniformly dispersed CMC-PEI mixed solution (CMC:PET mass ratio 1:0.3).

[0053] Get 2g S / C compound, 0.25g CNT (carbon nanotube) and 4.231g CMC-PEI mixed solution (CMC-PEI accounts for 10% of the dry weight mass of the total substance of the three), after grinding uniformly, dropwise add mass concentration 0.5 g of 10% glutaraldehyde aqueous solution, the slurry was stirred at high speed during the dropwise addition, and after in-situ cross-linking at room temperature of 25° C., the positive electrode slurry was obtained.

[0054] The obtained positive electrode slurry was coated on an alum...

Embodiment 2

[0056] Get 20g distilled water, add 1g carboxymethylcellulose (CMC, average relative molecular mass 800~1200), obtain uniform CMC aqueous solution after mechanical stirring; Then continue to add 3.333g mass concentration to CMC aqueous solution and be 30% polyethylene Amine (PEI, weight average molecular weight 3000-3500) aqueous solution, mechanically stirred to obtain a uniformly dispersed CMC-PEI mixed solution (CMC:PET mass ratio 1:1).

[0057] Get 2g S / C composite, 0.25g CNT (carbon nanotube) and 3.042g CMC-PEI mixed solution (CMC-PEI accounts for 10% of the dry weight mass of the total substance of the three), after grinding uniformly, dropwise add mass concentration 0.5 g of 10% glutaraldehyde aqueous solution, the slurry was stirred at high speed during the dropwise addition, and after in-situ cross-linking at room temperature of 25° C., the positive electrode slurry was obtained.

[0058] The obtained positive electrode slurry was coated on an aluminum foil, and dried...

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Abstract

The invention provides a lithium-sulfur battery binder, a preparation method thereof, cathode slurry and a preparation method thereof. The lithium-sulfur battery binder comprises three-dimensional network macromolecules, wherein the three-dimensional network macromolecules are obtained by the cross-linking reaction of carboxymethyl cellulose, polyethyleneimine and a cross-linking agent. The binderprovided by the invention can effectively improve the problems of high dissolubility and each shuttle of polysulfide, and thus can effectively improve the cycle performance of the battery when the sulfur-based active material is used as an active substance of a cathode material of the lithium-sulfur battery.

Description

technical field [0001] The invention relates to the technical field of batteries, in particular to a lithium-sulfur battery binder and a preparation method thereof, a cathode slurry and a preparation method thereof. Background technique [0002] With the rapid development of electronic equipment, electric vehicles, and space equipment, higher and higher requirements are placed on batteries. It is of great significance to develop batteries with high specific energy, low cost, and environmental friendliness. Lithium-sulfur battery is an important member of lithium-ion batteries. Its specific capacity is as high as 1675mAh / g, and its specific energy density is as high as 2500Wh / kg, which is 4 to 5 times the theoretical specific capacity of commercial lithium-ion batteries. It has broad application prospects. . [0003] However, the lithium-sulfur battery still has the following problems in the process of commercialization: (1) the active material S and the reaction product Li ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M10/0525C08J3/24C08L1/28C08L79/02
CPCY02E60/10
Inventor 柯菲苗力孝霍晓梅池子翔
Owner 桑德新能源技术开发有限公司
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