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Positive plate and battery

A technology of positive electrode sheet and positive electrode current collector, which is applied in the field of positive electrode sheet and battery, can solve the problem of low battery cycle performance, achieve the effect of improving battery cycle performance and high temperature stability

Pending Publication Date: 2021-08-03
ZHUHAI COSMX BATTERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Embodiments of the present invention provide a positive electrode sheet and a battery to solve the problem of low cycle performance of batteries in the prior art

Method used

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Examples

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preparation example Construction

[0063] See Figure 4 , Figure 4 It is a flowchart of a method for preparing a positive electrode sheet provided by an embodiment of the present invention. Such as Figure 4 As shown, the preparation method of the positive electrode sheet comprises:

[0064] Step 401, forming a positive electrode current collector, the positive electrode current collector includes a first side and a second side opposite to each other;

[0065] Step 402, sequentially coating a first active material layer and a second active material layer on at least one of the first side and the second side;

[0066] Wherein, the content of aluminum element in the first active material layer is smaller than the content of aluminum element in the second active material layer.

[0067] In the embodiment of the present invention, by setting the aluminum element content of the first active material layer close to the positive electrode current collector to be lower than the aluminum element content of the seco...

Embodiment 1

[0086] Example 1: Take the above-mentioned A slurry and B slurry, and use a double-layer coating method to coat A slurry on the bottom layer and B slurry on the surface layer, according to the ratio of A:B=4:6 The ratio is coated, and the others are the same as Comparative Example 1.

Embodiment 2

[0087] Example 2: Take the above-mentioned A slurry and B slurry, and use a double-layer coating method to coat A slurry on the bottom layer and B slurry on the surface layer, according to the ratio of A:B=5:5 Ratio is coated, and others are identical with embodiment 1.

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Abstract

The invention provides a positive plate and a battery, the positive plate comprises a positive current collector, the positive current collector comprises a first side surface and a second side surface which are opposite to each other, and at least one of the first side surface and the second side surface is provided with a first active material layer and a second active material layer; the first active material layer is positioned between the second active material layer and the positive electrode current collector; and the aluminum element content in the first active material layer is smaller than the aluminum element content in the second active material layer. The embodiment of the invention can improve the cycle performance of the battery.

Description

technical field [0001] The invention relates to the technical field of batteries, in particular to a positive electrode sheet and a battery. Background technique [0002] Nowadays, lithium-ion batteries have become energy storage devices for mainstream electronic products. With people's demand for energy density of lithium-ion batteries, it has become an industry trend to combine high-voltage lithium cobalt oxide with a positive electrode sheet with a larger surface density to ensure a large surface density positive electrode The stability of the sheet in the high-voltage system and high-temperature cycling process is the key to improving battery performance. [0003] In the prior art, a lithium-ion battery is mainly composed of five parts: a positive electrode, a negative electrode, an electrolyte, a separator, and a casing. Due to the uneven distribution of delithiation of the positive electrode sheet, the inner layer of the positive electrode sheet close to the separator...

Claims

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Application Information

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IPC IPC(8): H01M4/131H01M4/1391H01M4/36H01M4/525H01M10/0525
CPCH01M4/131H01M4/1391H01M4/525H01M4/366H01M10/0525H01M2004/028Y02E60/10
Inventor 韦世超彭冲陈博李俊义
Owner ZHUHAI COSMX BATTERY CO LTD
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