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Electrochemical device and electric equipment

An electrochemical and isolation layer technology, applied in the field of electrochemical devices and electrical equipment, can solve the problems of low safety performance, large adhesion between the isolation layer and the pole piece, etc., to improve energy density, improve lithium deposition phenomenon, improve The effect of the cyclic expansion phenomenon

Active Publication Date: 2021-07-09
NINGDE AMPEREX TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In view of this, the present application provides an electrochemical device and electrical equipment to improve the problem of low safety performance caused by the strong adhesion between the isolation layer and the pole piece

Method used

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  • Electrochemical device and electric equipment
  • Electrochemical device and electric equipment
  • Electrochemical device and electric equipment

Examples

Experimental program
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Effect test

preparation example Construction

[0086] The embodiment of the present application further provides a method for preparing an isolation layer, which is used to prepare at least one of the aforementioned isolation layers. In the following, the material of the isolation layer contains at least polymer fibers as an example, combined with Figure 7 As shown, the preparation method of the isolation layer is described.

[0087] S11: Spraying a solution containing at least a polymer on at least one surface of the positive electrode sheet or the negative electrode sheet by using a spinning process, and drying to form a separation layer.

[0088] S12: Assembling the positive electrode sheet and the negative electrode sheet into an electrochemical device after predetermined treatment.

[0089] The preparation process and materials of the positive electrode sheet and the negative electrode sheet are not limited in the embodiments of the present application.

[0090] In some examples, negative electrode active material ...

Embodiment 1

[0117] (1) Preparation of negative electrode sheet: Mix negative electrode active material graphite, conductive carbon black, and styrene-butadiene rubber in a weight ratio of 96:1.5:2.5, add deionized water, prepare a slurry with a solid content of 0.7, and stir evenly , and then evenly coat the slurry on one surface of the negative electrode collector (such as copper foil), and dry it at 110°C to obtain a negative electrode active material layer, and then use the same process on the other surface of the negative electrode collector Another negative electrode active material layer was formed. Further, after cutting the pieces and welding the tabs, the negative electrode sheet is obtained.

[0118] (2) Preparation of the positive electrode sheet: mix the positive electrode active material lithium cobaltate, conductive carbon black, and polyvinylidene fluoride according to a weight ratio of 97.5:1.0:1.5, add N-methylpyrrolidone as a solvent, and prepare a solid content of 0.75...

Embodiment 2

[0133] The difference from Example 1 is that the polymer fiber on the second surface of the positive electrode sheet is polyimide (PI). The second surface is the surface on which the positive electrode sheet is attached to the solution B, and the first surface is opposite to the second surface.

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Abstract

The invention discloses an electrochemical device and electric equipment. The same pole piece and the isolating layers on the two sides have different binding power, and the positive and negative pole pieces can move relatively during expansion, so that the risks of structural deformation and current collector breakage can be reduced, and the mechanical safety performance of the battery is improved; and the binding power on one side is reduced, so that the dynamic advantage of the battery can be maintained, the deformation rate of the battery cell is reduced, and the rate performance is improved.

Description

technical field [0001] The present application relates to the field of battery technology, in particular to an electrochemical device and electrical equipment. Background technique [0002] In an electrochemical device (such as a lithium-ion battery), the isolation layer is arranged between the positive electrode and the negative electrode. Its main function is to isolate the positive electrode and the negative electrode to prevent the direct conduction of electrons between the positive and negative electrodes and cause the battery to short circuit. At the same time, the ions in the electrolyte are allowed to pass freely. [0003] One of the mainstream technologies for preparing the isolation layer in the industry is the non-diaphragm technology, that is, the material for preparing the isolation layer is directly formed on the surface of the pole piece by a doctor blade method. However, the adhesive force between the separator and the electrode sheet made by the separator-f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/13H01M10/0525H01M10/0587
CPCH01M4/13H01M10/0525H01M10/0587Y02P70/50
Inventor 翁秋燕张益博魏红梅
Owner NINGDE AMPEREX TECH