Negative plate and battery comprising same

A technology of negative electrode sheet and negative electrode, which is applied in the field of negative electrode sheet and batteries including the negative electrode sheet, can solve the problems of low utilization rate of negative electrode sheet, etc., achieve the goal of improving rate performance and energy density, improving concentration polarization, and improving utilization rate Effect

Pending Publication Date: 2022-05-17
ZHUHAI COSMX BATTERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to improve the problems existing in the prior art, the present invention provides a negative electrode sheet and a battery including the negative electrode sheet, the negative electrode sheet can improve the rate performance and energy density of the battery, and can effectively solve the problem of high energy density batteries Under fast charging conditions, the utilization rate of the negative electrode sheet is low, and the problem of lithium precipitation on the surface

Method used

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  • Negative plate and battery comprising same
  • Negative plate and battery comprising same
  • Negative plate and battery comprising same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0084] Mix 80wt% garnet-type solid electrolyte LLZO, 5wt% conductive carbon black and 15wt% polyvinylidene fluoride, add N-methylpyrrolidone to stir and disperse to form a slurry, that is, electrolyte supplement layer slurry.

[0085] The graphite that particle diameter Dv50 is 15 μ m prepares negative electrode slurry as negative electrode active material: according to negative electrode active material 96.8%, conductive agent (conductive carbon black) 1.2%, binder (styrene-butadiene rubber) 2% mass ratio and water Mixing and stirring to prepare negative electrode active material layer slurry, the viscosity of the slurry is 2000-5000 mPa·s, and the solid content is 40%-50%.

[0086] The electrolyte replenishment layer slurry and the negative electrode active material layer slurry are coated on the negative electrode current collector using a double-layer coating device, wherein the electrolyte replenishment layer is coated on the negative electrode current collector, and the n...

Embodiment 2～3

[0090] Other operations were the same as in Example 1, except that the thickness H of the negative electrode active material layer and the radius R of the first alignment hole after drying and rolling were different, as shown in Table 1 for details.

Embodiment 4

[0092] The other operations are the same as in Example 1, the difference is that the first orientation hole with a radius R of 25 μm is constructed on the negative electrode active material layer, and the first orientation hole with a radius R of 25 μm is constructed on the electrolyte replenishment layer by using the method of arranging the nail plate in an array and rolling. The second orientation hole, the third orientation hole with a radius L of 25 μm is constructed on the negative electrode current collector, the specific structure is as follows figure 2 shown.

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Abstract

The invention provides a negative plate and a battery comprising the negative plate. The negative plate comprises a negative current collector, an electrolyte supplementing layer and a negative active material layer, the electrolyte supplementing layer is positioned on the surface of one side or two sides of the negative electrode current collector, and the negative electrode active material layer is positioned on the surface of the electrolyte supplementing layer; the negative electrode active material layer is provided with a first orientation hole. By using the negative plate, the rate capability and the energy density of the battery can be improved at the same time, and the lithium separation risk is reduced, the utilization rate of the electrode plate is improved and the energy density is improved by constructing an orientation hole rapid ion channel on the surface of the electrode plate.

Description

technical field [0001] The invention belongs to the technical field of batteries, and in particular relates to a negative electrode sheet and a battery including the negative electrode sheet. Background technique [0002] Batteries have been widely used in mobile phones, notebook computers, new energy vehicles and other fields due to their advantages such as high energy density, high working voltage, and good cycle storage performance. [0003] As the current requirements for the energy density and fast charging performance of lithium-ion batteries are getting higher and higher, the traditional method of improving the energy density of lithium-ion batteries is to make a compromise between the surface density of the electrode and the fast charging performance, which means When increasing the rate performance, the energy density of the battery will inevitably be sacrificed. [0004] Not only that, high energy density lithium-ion batteries under fast charging conditions, due t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M4/133H01M10/0525
CPCH01M4/133H01M4/628H01M10/0525H01M2004/027H01M2004/021
Inventor 胡典洋李素丽
Owner ZHUHAI COSMX BATTERY CO LTD
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