Positive electrode sheet, electrochemical device, and electronic device

A positive pole piece, electrochemical technology, applied in the field of electronics, can solve the problems of insufficient adhesion between the positive pole piece and the separator, weak adhesion between the positive pole piece and the separator, and deformation of the electrode assembly, so as to avoid chemical reactions. Destructive effect, improve adhesion, improve deformation effect

Inactive Publication Date: 2020-09-18
DONGGUAN POWERAMP TECH LTD
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  • Abstract
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  • Claims
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Problems solved by technology

[0003] However, for the electrode assembly structure of a positive electrode sheet containing an active material (for example, a ternary material) that is alkaline on the surface, the surface of the positive electrode sheet containing the active material is relatively strong, causing the active material to be isolated from some

Method used

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  • Positive electrode sheet, electrochemical device, and electronic device
  • Positive electrode sheet, electrochemical device, and electronic device
  • Positive electrode sheet, electrochemical device, and electronic device

Examples

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Example Embodiment

[0039] Example 1

[0040] The preparation of the negative pole piece: The current collector adopts copper foil with a thickness of 10 μm. The negative electrode active material uses graphite, the conductive agent uses acetylene black, and the binder uses styrene butadiene rubber and sodium carboxymethyl cellulose. The negative electrode active material, acetylene black, styrene-butadiene rubber and sodium carboxymethyl cellulose are mixed in a mass percentage ratio of 96:1:1.5:1.5 and then dispersed in deionized water to form a slurry, which is evenly stirred and then coated on copper foil It is dried to form a negative electrode active material layer. The thickness of the negative electrode active material layer is 45 μm. After cold pressing and slitting, a negative electrode piece is obtained.

[0041] Preparation of positive pole piece: take the second active material LiNi 0.5 Co 0.2 Mn 0.3 O 2 , Acetylene black, binder polyvinylidene fluoride (PVDF) according to the mass perce...

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Abstract

The embodiment of the invention provides a positive pole piece, an electrochemical device and an electronic device. The positive pole piece comprises a current collector, a first layer and a second layer. The first layer includes at least one selected from a ceramic material, a carbon-based material, a first active material, and an organic material. The second layer is disposed between the currentcollector and the first layer, the second layer includes a second active material, and the surface of the second layer is alkaline. According to the invention, the second layer is arranged between the current collector and the first layer, direct contact between the second layer with the alkaline surface and a diaphragm coating is avoided, such that the chemical damage effect of the second activematerial of the second layer on the diaphragm coating is avoided, the adhesion force between a positive electrode sheet and a diaphragm is improved, deformation of the electrode assembly during use is improved, and the service life of the electrochemical device is prolonged.

Description

technical field [0001] The present application relates to the field of electronic technology, in particular to a positive pole piece, an electrochemical device and an electronic device. Background technique [0002] In the existing electrode assembly structure, the positive pole piece is in direct contact with the separator with an adhesive layer, especially in some electrode assemblies, the surface of the separator substrate is coated with polyacrylate material. It has been confirmed that the polyacrylate coating of the separator has strong adhesion to the negative electrode active material (for example, graphite), and the polyacrylate coating is coated with an aqueous solution, which is coated on both sides of the separator substrate. , low processing cost, environmentally friendly, and conducive to industrial production, so it is an industry trend to coat polyacrylate coatings on the isolation film. [0003] However, for the electrode assembly structure of a positive ele...

Claims

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Application Information

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IPC IPC(8): H01M4/131H01M2/16H01M4/1391H01M4/62H01M10/0525H01M10/058
CPCH01M4/131H01M4/1391H01M4/622H01M10/0525H01M10/058H01M2004/028Y02E60/10Y02P70/50
Inventor 王慧鑫丰炳梅卞春花汪颖
Owner DONGGUAN POWERAMP TECH LTD
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