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Electrochemical devices and electrical equipment

An electrochemical and isolation layer technology, which is applied in the field of electrochemical devices and electrical equipment, can solve the problems of high adhesion between the isolation layer and the pole piece, and low safety performance, so as to improve the phenomenon of lithium analysis, increase the energy density, and improve the The effect of interface performance

Active Publication Date: 2022-07-26
NINGDE AMPEREX TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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 devices and electrical equipment
  • Electrochemical devices and electrical equipment
  • Electrochemical devices and electrical equipment

Examples

Experimental program
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Effect test

preparation example Construction

[0086] Embodiments of the present application further provide a method for preparing an isolation layer for preparing at least one of the foregoing isolation layers. In the following, the material of the isolation layer at least contains polymer fibers as an example, combined with Figure 7 As shown, the method of making the isolation layer is described.

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

[0088] S12: Assemble 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, the negative electrode active material graphite, conductive carbon...

Embodiment 1

[0117] (1) Preparation of negative electrode sheet: The negative electrode active material graphite, conductive carbon black, and styrene-butadiene rubber are mixed according to the weight ratio of 96:1.5:2.5, deionized water is added, and the slurry with a solid content of 0.7 is prepared and stirred evenly , and then uniformly coat the slurry on one surface of the negative electrode current 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 current collector. Another negative electrode active material layer is formed. Further, through cutting pieces and welding tabs, a negative electrode piece is obtained.

[0118] (2) Preparation of positive electrode sheet: The positive electrode active material lithium cobalt oxide, conductive carbon black, and polyvinylidene fluoride are mixed according to the weight ratio of 97.5:1.0:1.5, and N-methylpyr...

Embodiment 2

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

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Abstract

The present application discloses an electrochemical device and electrical equipment. The bonding force between the same pole piece and the isolation layers on both sides is different, and the positive and negative pole pieces can move relative to each other when they expand, which can reduce the risk of structural deformation and current collector breakage, and improve the mechanical safety performance of the battery; The reduced junction force maintains the battery kinetic advantage, reduces the deformation rate of the cell, and improves its rate performance.

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 sheet and the negative electrode sheet. Its main function is to isolate the positive electrode sheet and the negative electrode sheet, so as to prevent the direct conduction of electrons between the positive and negative electrodes and cause a short circuit of the battery. 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 the blade coating method. However, the adhesive force between the separator and the pol...

Claims

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Application Information

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Patent Type & Authority Patents(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