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Positive pole piece and lithium ion battery containing the positive pole piece

A technology of lithium ion battery and positive pole piece, applied in secondary battery, secondary battery repair/maintenance, non-aqueous electrolyte battery electrode, etc. The effect of extending and avoiding short circuit phenomenon

Active Publication Date: 2020-08-18
NINGDE AMPEREX TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The lithium-ion battery prepared by using the positive electrode sheet of the present application can solve the problem of failure of the lithium-ion battery through nails, and has higher safety

Method used

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  • Positive pole piece and lithium ion battery containing the positive pole piece
  • Positive pole piece and lithium ion battery containing the positive pole piece
  • Positive pole piece and lithium ion battery containing the positive pole piece

Examples

Experimental program
Comparison scheme
Effect test

no. 1 approach

[0041] The inventors of the present application have found that in the positive electrode sheet, a polymer coating is provided on the two opposite surfaces of the positive electrode current collector, which can protect the positive electrode current collector from being exposed during the nailing process, and from contact with the negative electrode active material layer and the negative electrode active material layer. Negative current collector contacts. When the battery is improperly used such as acupuncture and extrusion, it can reduce the extension of the positive electrode current collector, reduce the generation of burrs, cloaks, etc., thereby preventing the positive electrode current collector from contacting the negative electrode active material layer, and can effectively avoid positive electrode collectors. The short-circuit phenomenon occurs when the fluid contacts the negative active material layer, which improves the failure problem of the lithium-ion battery thro...

no. 2 approach

[0072] The second embodiment of the present application provides a method for preparing the positive electrode sheet of the present application, including the following steps:

[0073] Provide current collectors and raw materials including polymer compounds;

[0074] After dissolving or partially dissolving the raw materials, a slurry is obtained;

[0075] The slurry is continuously or intermittently coated on two opposite surfaces of the current collector.

[0076] Specifically, the coating method includes but is not limited to: at least one of transfer, doctor blade, extrusion, dip coating, and coating.

no. 3 approach

[0078] Such as image 3 middle Figure 3-1 As shown, the third embodiment of the present application provides a lithium ion battery, the lithium ion battery includes: a positive pole piece 1; a negative pole piece 2; a separator 3, the separator 3 is arranged on the positive pole piece 1 and the negative pole piece 2; and the electrolyte. Wherein, the positive electrode sheet 1 is any one of the positive electrode sheets 1 provided in the first embodiment of the present application.

[0079] In one or more embodiments, the negative electrode sheet 2 includes a negative electrode current collector 22 and a negative electrode active material layer 21 , and the negative electrode active material layer 21 is formed on at least one surface of the negative electrode current collector 22 . Specifically, the negative electrode collector 22 may be copper foil. The material of the negative active material layer 21 may include, but not limited to, a negative active material and a nega...

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Abstract

The application provides a positive pole piece and a lithium ion battery containing the positive pole piece. The positive electrode sheet includes: a current collector; and a polymer coating disposed on two opposite surfaces of the current collector; the polymer coating includes a polymer compound containing a polar group group. When the lithium-ion battery prepared by using the positive electrode sheet of the present application encounters improper use such as acupuncture and extrusion, the polymer coating can protect the current collector, reduce the extension of the current collector, and reduce the generation of burrs, cloaks, etc. , and form a corresponding protective layer on the surface of the aluminum foil, thereby preventing the contact between the positive electrode current collector and the negative electrode active material layer, which can effectively avoid the short circuit between the positive electrode current collector and the negative electrode active material layer, and improve the failure of lithium-ion batteries. , thereby improving the safety of lithium-ion batteries.

Description

technical field [0001] The application belongs to the field of batteries, and in particular relates to a positive pole piece and a lithium ion battery containing the positive pole piece. Background technique [0002] Safety is the most important quality of a product, and an unsafe product has no practical value. [0003] In the prior art, the safety performance of the battery is generally improved by changing the structure of the battery or thickening the ceramic coating of the separator. Among them, the battery vest structure mainly reduces the short-circuit power by increasing the Cu foil-Al foil short-circuit to share the energy of the battery cell; the thickened ceramic coating mainly reduces the risk of short-circuit failure by reducing thermal diffusion. However, these means have a limited effect on nail penetration, and the nail penetration rate is low, which cannot fundamentally solve the short circuit between the positive electrode current collector and the negativ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/13H01M10/42H01M10/0587H01M10/0525
CPCY02E60/10Y02P70/50
Inventor 林超旺杨帆钟华炜苏义松屈长明张晓振
Owner NINGDE AMPEREX TECH