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Slow-release electrolyte, preparation thereof and application of slow-release electrolyte in lithium ion battery

An electrolyte and slow-release technology, which is applied in the field of lithium-ion batteries, can solve the problems of difficulty in electrolyte replenishment, achieve the effects of increasing performance, maintaining wetness, and slowing down collapse

Active Publication Date: 2021-09-17
ZHUHAI COSMX BATTERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to improve the difficulty of replenishing the electrolyte in the prior art, the present invention provides a slow-release electrolyte and its preparation and application in lithium-ion batteries

Method used

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  • Slow-release electrolyte, preparation thereof and application of slow-release electrolyte in lithium ion battery
  • Slow-release electrolyte, preparation thereof and application of slow-release electrolyte in lithium ion battery
  • Slow-release electrolyte, preparation thereof and application of slow-release electrolyte in lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] (1) slow release electrolyte

[0048] Mix a formaldehyde solution with a mass concentration of 37% (including 150g formaldehyde) and 200g melamine, add 5gNaOH, heat up to 60°C, react for 240min, remove water under low pressure (less than 0.1Pa), and prepare a melamine formaldehyde resin with a molecular weight of 50,000 to 100,000;

[0049] Mix 37% formaldehyde aqueous solution (including 100g formaldehyde) and 200g melamine, add 5gNaOH, heat up to 60°C, react for 240min, remove water under low pressure (less than 0.1Pa), and prepare melamine formaldehyde resin with a molecular weight of 100000-150000;

[0050] Mix 300 g of the melamine formaldehyde resin with a molecular weight of 50,000 to 100,000 prepared above and 100 g of electrolyte (EC:DEC:PP=3:3:4 (volume ratio), lithium hexafluorophosphate whose lithium salt is 1 mol / L) in a reactor , place the whole reactor in an environment with humidity <30% RH and temperature <20°C, then raise the temperature of the reactor...

Embodiment 2

[0061] Other operations are with embodiment 1, difference is in the step (4):

[0062] Disperse 25wt% of the above-mentioned slow-release electrolyte, 64wt% alumina, 7wt% binder SBR, and 4wt% dispersant CMC in water, stir and coat evenly on the surface of one side of a 5 μm thick polyethylene diaphragm substrate, Dry to obtain a diaphragm coated with a ceramic layer with a thickness of 2 μm on one side; disperse the binder PVDF in water, stir and coat evenly on both sides of the diaphragm coated with a ceramic layer on one side, and dry to obtain a single-sided coating A diaphragm coated with a ceramic layer and coated with an adhesive layer on both sides (the thickness of the adhesive layer on one side is 1 μm).

Embodiment 3

[0064] Other operations are with embodiment 1, difference is in the step (4):

[0065] Disperse 5wt% of the above-mentioned slow-release electrolyte, 84wt% alumina, 7wt% binder SBR, and 4wt% dispersant CMC in water, stir and evenly coat one side of the polyethylene diaphragm substrate with a thickness of 5 μm. Dry to obtain a diaphragm coated with a ceramic layer with a thickness of 2 μm on one side; disperse the binder PVDF in water, stir and coat evenly on both sides of the diaphragm coated with a ceramic layer on one side, and dry to obtain a single-sided coating Separator with ceramic layer and double-sided adhesive layer (the thickness of the adhesive layer on one side is 1 μm).

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Abstract

The invention provides a slow-release electrolyte, a preparation thereof and the application of the slow-release electrolyte in a lithium ion battery. The slow-release electrolyte has the property of slowly releasing the internal electrolyte along with temperature rise, and the melamine formaldehyde resin not only can coat the electrolyte, but also can continuously and slowly release the electrolyte in a high-temperature environment for a long time, so that the capability of continuously releasing the electrolyte is achieved. The lithium ion loss in a high-temperature environment can be supplemented in time, the capacity loss caused by the lithium ion loss is reduced, the service life and the circulation capability of the battery cell can be prolonged by supplementing the electrolyte in time, and the capacity of the battery cell is maintained at a relatively high level.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion batteries, and in particular relates to a slow-release electrolyte, its preparation and application in lithium-ion batteries. Background technique [0002] At present, under the first formation and cycle of lithium-ion batteries, lithium ions will be consumed continuously as long as the battery cells are charged and discharged. As the number of charge-discharge cycles increases, the electrolyte and lithium ions will be continuously consumed, resulting in the loss of the entire battery system. The number of movable lithium ions in the battery decreases. If the battery system cannot replenish the electrolyte in time, the negative electrode will not be able to embed enough lithium metal, and a large area of ​​black spots will appear (such as figure 1 As shown, black spots with irregular shapes appear on the surface of the negative electrode, and the main location is on the single side of the nega...

Claims

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Application Information

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IPC IPC(8): H01M10/0566H01M50/449H01M10/0525
CPCH01M10/0566H01M50/449H01M10/0525H01M2300/0025Y02E60/10
Inventor 赵君义李素丽
Owner ZHUHAI COSMX BATTERY CO LTD
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