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Electrode plate, preparation method thereof and secondary battery formed by electrode plate

A positive electrode plate and positive electrode technology, applied in the field of secondary batteries, can solve problems such as insufficient safety, and achieve the effects of overcoming the easy dissolution of electrodes, reducing costs, and achieving cycle stability

Pending Publication Date: 2022-05-31
SVOLT ENERGY TECHNOLOGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Therefore, the technical problem to be solved by the present invention is to overcome the defect of insufficient safety in batteries that meet the energy density requirements in the prior art, thereby providing an electrode that can not only have a higher energy density, but also ensure safety performance. Sheet and its preparation method and secondary battery constituted

Method used

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  • Electrode plate, preparation method thereof and secondary battery formed by electrode plate
  • Electrode plate, preparation method thereof and secondary battery formed by electrode plate
  • Electrode plate, preparation method thereof and secondary battery formed by electrode plate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] A positive pole piece, its specific preparation method is as follows:

[0051] 1. Weigh 500g of NCM811 ternary material, mix it with the same mass of conjugated lithium sulfonate, add it into a ball mill jar, and the ball milling time is 1h, the ball milling speed is 1200r / min, and the mixture is obtained.

[0052] 2. Put the organic solvent NMP (N-methylpyrrolidone) in a vacuum stirred tank, add PVDF (polyvinylidene fluoride, binder), carbon black, carbon nanotubes and the above-mentioned mixture in turn, and vacuumize and stir After 6 hours, a mixed slurry was obtained. The mass ratio of the components in the mixed slurry is: ternary material: conjugated lithium sulfonate: PVDF: carbon black: carbon nanotubes = 46:46:4:3.5:0.5, the solid content of the mixed slurry is controlled At 70%.

[0053] 3. Coating on an aluminum current collector with a thickness of 12 microns, the thickness of the coating is 70 microns, drying and hot pressing to obtain the positive electr...

Embodiment 2

[0056] A positive pole piece, its specific preparation method is as follows:

[0057] 1. Weigh 500g of lithium cobaltate material, mix it with the same mass of conjugated lithium sulfonate, add it to a ball mill jar, and the ball milling time is 1h, and the ball milling speed is 1200r / min to obtain the mixture.

[0058] 2. Put NMP in a vacuum stirred tank, add PVDF, carbon black, carbon nanotubes and the above-mentioned mixture in sequence, and stir under vacuum for 6 hours to obtain a mixed slurry. The mass ratio of the components in the mixed slurry is: ternary material: conjugated lithium sulfonate: PVDF: carbon black: carbon nanotubes=46:46:4:3.5:0.5, the solid content of the mixed slurry is controlled At 70%.

[0059] 3. Coating on a 12-micron aluminum current collector with a coating thickness of 70 microns, drying and hot-pressing to obtain the positive electrode sheet.

[0060] A pouch battery with a rated capacity of 5Ah was assembled using the same negative electro...

Embodiment 3

[0062] A positive pole piece, its specific preparation method is as follows:

[0063] 1. Weigh 500g of lithium iron phosphate material, mix it with the same mass of conjugated lithium sulfonate, add it into a ball mill jar, and the ball milling time is 1h, the ball milling speed is 1200r / min, and the mixture is obtained.

[0064] 2. Put NMP in a vacuum stirred tank, add PVDF, carbon black, carbon nanotubes and the above-mentioned mixture in sequence, and stir under vacuum for 6 hours to obtain a mixed slurry. The mass ratio of the components in the mixed slurry is: ternary material: conjugated lithium sulfonate: PVDF: carbon black: carbon nanotubes=46:46:4:3.5:0.5, the solid content of the mixed slurry is controlled At 70%.

[0065] 3. Coating on a 12-micron aluminum current collector with a coating thickness of 70 microns, drying and hot-pressing to obtain the positive electrode sheet.

[0066] A pouch battery with a rated capacity of 5Ah was assembled using the same negati...

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Abstract

The invention discloses an electrode plate, a preparation method of the electrode plate and a secondary battery formed by the electrode plate, and the electrode plate comprises a current collector and a positive electrode material, the positive electrode material is loaded on a current collector and comprises a lithium-containing organic positive electrode raw material and an inorganic positive electrode raw material. And the organic positive electrode raw material is conjugated lithium sulfonate and derivatives thereof. The organic positive electrode raw material and the inorganic positive electrode raw material are used as active components of the positive electrode plate at the same time, so that high energy density is achieved, cycle stability is guaranteed, and safety performance of a battery prepared from the positive electrode plate is remarkably improved.

Description

technical field [0001] The invention relates to the field of lithium ion batteries, in particular to an electrode pole piece, a preparation method thereof, and a secondary battery formed therefrom. Background technique [0002] Compared with traditional secondary batteries such as lead-acid batteries and nickel-hydrogen batteries, lithium-ion batteries have the advantages of high energy density, wide voltage window and long service life, and are widely used in high-value consumer electronics and power batteries. However, the global reserves of lithium resources are limited, and the content of lithium in the earth's crust is only 0.0065%. With the development of new energy vehicles, the demand for batteries has risen sharply, and the bottleneck of resources has gradually emerged. The high cost limits the use of lithium-ion batteries. large-scale application. Therefore, it is necessary to try to find a more suitable material system. [0003] At present, the positive electrod...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/13H01M4/139H01M10/0525
CPCH01M4/13H01M4/139H01M10/0525Y02P70/50
Inventor 沈晓帆郑军华
Owner SVOLT ENERGY TECHNOLOGY CO LTD
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