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Lithium ion battery and diaphragm thereof

A lithium-ion battery and separator technology, applied in battery pack parts, circuits, electrical components, etc., can solve the problems of insufficient cell hardness, poor dimensional consistency, cell deformation, etc., to ensure the appearance of winding, Good fit and increased friction

Active Publication Date: 2014-06-18
NINGDE AMPEREX TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] One of the purposes of the present invention is to provide a diaphragm that can improve the problems of battery deformation, insufficient hardness of the battery and poor dimensional consistency, and improve the safety performance of the battery in view of the deficiencies of the prior art.

Method used

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  • Lithium ion battery and diaphragm thereof
  • Lithium ion battery and diaphragm thereof
  • Lithium ion battery and diaphragm thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] The preparation of negative pole piece: take graphite as the negative electrode active material, and its weight content is 95%; With styrene-butadiene rubber (SBR) as binding agent, its weight content is 2%; With carbon black as conductive agent, its weight content is 3%; the above materials were added to deionized water and stirred evenly to make negative electrode slurry; the negative electrode slurry was evenly coated on copper foil, dried and compacted, and then cut into pieces and welded with negative electrode lugs to obtain negative electrode sheets .

[0048] Preparation of positive electrode sheet: lithium cobalt oxide (LiCoO 2 ) is positive electrode active material, and its weight content is 96%; With polyvinylidene fluoride (PVDF) as binding agent, its weight content is 2%; With carbon black as conductive agent, its weight content is 2%; Above-mentioned material Add it into N-methylpyrrolidone (NMP) and stir evenly to make a positive electrode slurry; sprea...

Embodiment 2

[0056] Different from Example 1, there is preparation of rough surface diaphragm:

[0057] The first step, the preparation of treatment solution: dissolve polyvalent alcohol surfactant inducer (fluffing agent FS-202, milky white liquid) in ethyl acetate and acetone, the mass fraction of inducer is between 1.0~5%, acetic acid The mass ratio of ethyl ester and acetone is 0.4:1~5:1;

[0058] The second step is to treat the diaphragm by dipping: put the non-woven polyethylene terephthalate diaphragm to be treated (thickness: 15 μm, tensile strength: 50 kPa, porosity: 40%) in the above-mentioned treatment solution After half an hour of treatment, the separator was taken out and dried in a humidity and temperature controlled drying oven to obtain a separator with a rough surface. In order to realize industrialization, multi-cylinder continuous impregnation can be adopted, and a drying oven with controllable temperature and humidity is set above each cylinder.

[0059] Observing th...

Embodiment 3

[0062] The difference from Example 1 is that the preparation of the diaphragm with a rough surface is by utilizing high-speed particles to impact the diaphragm (polyimide / polypropylene / polyimide composite structure, its thickness is 10 μm, the tensile strength is 20 kPa, and the porosity is 30%), and supplemented by the control of the disturbance field, all the other are the same as in Example 1.

[0063] Observing the obtained separator with a scanning electron microscope, it can be found that there are many fluffy and rough micro-protrusions on the surface of the treated separator. The surface roughness measured by Mitutoyo SJ-201 surface roughness tester is about 1 μm.

[0064] The rest are the same as in Embodiment 1, and will not be repeated here.

[0065] The batteries obtained in Comparative Examples 1 to 3 and Examples 1 to 3 are compared as follows:

[0066] One, compare the appearance of the diaphragm with rough surface prepared in Examples 1 to 3 and the diaphragm...

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Abstract

The invention belongs to the technical field of lithium ion batteries, in particular to a diaphragm with a rough surface. At least one surface of the diaphragm is the rough surface subjected to roughening; and the roughness of the rough surface is 0.5 to 5 mum. Compared with the prior art, the diaphragm has a relatively large surface friction coefficient and a relatively large static friction force; during coiling, the phenomenon of relative deviation caused by relative sliding between a coiling core of a coiling machine and the diaphragm is avoided; the width consistency and the coiling alignment are improved, and the problem of deformation of an electric core is solved; and moreover, the hardness of the electric core is improved due to the variation of the surface interface property. Furthermore, the invention also provides a lithium ion battery with the diaphragm.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a diaphragm with a rough surface and a lithium ion battery comprising the diaphragm. Background technique [0002] With the advancement of industry and the development of society, the excessive exploitation and use of natural resources, especially non-recyclable and difficult-to-renewable resources, will soon exhaust natural resources such as coal and oil. In this context, people are constantly Find new green alternative energy sources. [0003] With the continuous progress and development of energy alternative products, lithium-ion batteries have gradually become the focus of attention. Lithium-ion battery is a non-polluting green secondary energy that can be reused many times. It meets the requirements of environmental protection and sustainable development. Therefore, it is more and more favored by people in the industry and has broad application pro...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M2/18H01M2/16
CPCY02E60/12Y02E60/10
Inventor 路超何平彭业军曾毓群
Owner NINGDE AMPEREX TECH
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