Insulating tape, pole piece and electro-chemical device

A technology of insulating tape and pole piece, applied in the direction of electrode carrier/collector, circuit, adhesive, etc., can solve the problems of easy shrinkage and nail penetration failure

Pending Publication Date: 2021-05-14
NINGDE AMPEREX TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, because the green glue is easy to shrink at high temperature, it cannot solve the

Method used

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  • Insulating tape, pole piece and electro-chemical device
  • Insulating tape, pole piece and electro-chemical device
  • Insulating tape, pole piece and electro-chemical device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0062] (1) Preparation of insulating tape

[0063] Using PI film as the base material, the aluminum oxide ceramic particles are mixed with carboxymethyl cellulose adhesive and coated on one side of the PI film to form a coating, and the side of the coating away from the base material is coated with polyacrylate glue A glue layer is formed, and an insulating tape is obtained after curing. Wherein, the thickness of the substrate is 6 μm, the thickness of the adhesive layer is 1 μm, the viscosity of the adhesive layer is 20 N / m, the thickness of the coating is 19 μm, and the mass percentage of the ceramic particles in the coating is 85%.

[0064] (2) Preparation of cathode sheet

[0065] The cathode active material lithium cobaltate, the conductive agent acetylene black, and the binder polyvinylidene fluoride (PVDF) are fully stirred and mixed in the N-methylpyrrolidone solvent system according to the mass ratio of 94:3:3, and then coated on On the anode current collector Al fo...

Embodiment 2

[0073] The preparation method is the same as in Example 1, except that in Example 2, the thickness of the adhesive layer is 4 μm, the thickness of the coating is 3 μm, and the mass percentage of ceramic particles in the coating is 95%.

Embodiment 3

[0075] The preparation method is the same as in Example 1, except that in Example 3, PET film is used as the substrate, the viscosity of the adhesive layer is 100 N / m, and the mass percentage of ceramic particles in the coating is 95%.

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Abstract

The invention provides an insulating tape, and a pole piece and an electro-chemical device using the insulating tape. The insulating tape comprises a base material and a coating. The base material comprises a first surface and a second surface which are oppositely arranged. The coating is disposed on the first surface. The coating comprises hard particles and an adhesive, wherein the weight of the hard particles accounts for 30-99% of the total weight of the coating. According to the application, the hard particles are adopted in the coating, so that the insulating tape does not shrink when the electro-chemical device is subjected to a nail penetration test, and the nail penetration test passing rate of the electro-chemical device can be improved.

Description

technical field [0001] The present application relates to the field of electrochemical devices, in particular to an insulating tape, a pole piece and an electrochemical device using the insulating tape. Background technique [0002] Lithium-ion batteries have many advantages such as large volume and mass energy density, long cycle life, high nominal voltage, low self-discharge rate, small size, and light weight, and have a wide range of applications in the field of consumer electronics. With the rapid development of electric vehicles and mobile electronic devices in recent years, people have higher and higher demands on the energy density, safety, and cycle performance of lithium-ion batteries. [0003] The nail penetration test is a relatively stringent safety test for lithium-ion batteries, which is used to test the internal short-circuit withstand capacity of lithium-ion batteries. Due to the empty foil area in the inner ring of the lithium-ion battery, an aluminum-anode...

Claims

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Application Information

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IPC IPC(8): C09J7/20C09J7/30H01M4/66
CPCC09J7/201C09J7/30H01M4/667C09J2203/33Y02E60/10
Inventor 戴志芳龙海
Owner NINGDE AMPEREX TECH
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