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Multilayer electrode, preparation method of multilayer electrode and lithium ion battery

A lithium-ion battery and multi-layer electrode technology, which is applied in the direction of electrode manufacturing, electrode collector coating, electrode carrier/collector, etc., can solve the problems of lithium analysis and other performance attenuation, large expansion effect of conductive layer, etc., and achieve reduction Expansion effect, high energy density and charging rate, effect of increasing charging rate

Pending Publication Date: 2020-11-10
SUNWODA ELECTRIC VEHICLE BATTERY CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In the current electrodes, the conductive layer is usually coated on the surface of the current collector by a dry method. In order to achieve a higher energy density, the conductive layer is compacted thicker or more compact, but in the case of thicker or higher compaction In this case, the conductive layer is prone to a large expansion effect, resulting in performance attenuation and safety issues such as lithium precipitation in the conductive layer.

Method used

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  • Multilayer electrode, preparation method of multilayer electrode and lithium ion battery
  • Multilayer electrode, preparation method of multilayer electrode and lithium ion battery
  • Multilayer electrode, preparation method of multilayer electrode and lithium ion battery

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preparation example Construction

[0056] The embodiment of the application of the present invention also provides a method for preparing a multilayer electrode, such as figure 2 shown, including the following steps:

[0057] S1. Dispersing the first raw material in the first dispersant to form the first slurry, coating the first slurry on the surface of the current collector 1, drying and rolling to obtain the first conductive layer;

[0058] S2. Mix the second raw materials uniformly to obtain a mixture, and apply the mixture on the side of the first conductive layer away from the current collector 1 to obtain a second conductive layer.

[0059] The first raw material includes: a first active material, a first conductive agent and a first binder; the first dispersant is selected from one of water or nitrogen methyl pyrrolidone.

[0060] The second raw material includes: a second active material, a second conductive agent and a second binder.

[0061] Further, the mass percentage of the first active materia...

Embodiment 1

[0076] The current collector is nickel foil, and one surface of the current collector is coated with the first conductive layer, the second conductive layer and the third conductive layer in sequence. At this time, the first conductive layer and the third conductive layer are made by wet process, and the second The conductive layer is made by dry process. A riveted structure is formed between the first conductive layer and the second conductive layer, and a riveted structure is formed between the second conductive layer and the third conductive layer. The riveted structure is: because the first conductive layer and the third conductive layer are prepared by a wet process , the structure is relatively fluffy, when forming a multi-layer electrode with the second conductive layer, the second conductive layer will be partially embedded in the first conductive layer and the third conductive layer.

[0077] Preliminarily mixing graphite as the first active material, carbon black as ...

Embodiment 2

[0082] The current collector is copper foil, and one surface of the current collector is coated with the first conductive layer, the second conductive layer and the third conductive layer in sequence. At this time, the first conductive layer and the third conductive layer are made by wet process, and the second conductive layer The layers are made by dry process. A riveting structure is formed between the first conductive layer and the second conductive layer, and a riveting structure is formed between the second conductive layer and the third conductive layer.

[0083] Preliminarily mixing graphite as the first active material, carbon black as the first conductive agent, and polyacrylic acid as the first binder to obtain a mixture, adding water to the mixture as the first dispersant; stirring evenly to form a mixed slurry; The obtained slurry is coated on the current collector, and dried and rolled to obtain the first conductive layer. The thickness of the first conductive l...

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Abstract

The invention discloses a multilayer electrode and a lithium ion battery. The multilayer electrode comprises a current collector, a first conductive layer and a second conductive layer, wherein the first conductive layer and the second conductive layer are sequentially stacked on the surface of the current collector, the surface density of the first conductive layer is less than that of the secondconductive layer, and the surface density of the second conductive layer is less than that of the first conductive layer. The thickness of the first conductive layer is smaller than that of the second conductive layer, and the second conductive layer is partially embedded into the first conductive layer, so the expansion effect of the conductive layer of the battery pole piece is reduced.

Description

technical field [0001] The invention relates to the technical field of batteries, in particular to a multilayer electrode, a preparation method of the multilayer electrode and a lithium ion battery. Background technique [0002] As a new type of energy storage device, lithium-ion batteries are widely used in electronic products, electric vehicles and power grids. Lithium-ion performance indicators such as energy density and charging rate are increasingly valued by product developers. However, generally speaking, there is a certain contradiction between the energy density and the charging speed, that is, the higher the energy density, the charging speed will not be too high, and the higher the charging speed, the energy density will not be too high. Therefore, how to balance and improve these two technical indicators has become a technical research point. [0003] As far as the pole piece is concerned, increasing the energy density means increasing the content of the active...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/70H01M4/78H01M4/66H01M4/04H01M10/0525
CPCH01M4/70H01M4/78H01M4/667H01M4/0404H01M10/0525Y02E60/10
Inventor 刘鹏褚春波张耀
Owner SUNWODA ELECTRIC VEHICLE BATTERY CO LTD
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