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Membrane and secondary battery

A diaphragm and anti-static technology, which is applied to battery components, separators/films/diaphragms/spacers, circuits, etc., can solve problems affecting the normal operation of the winding machine, diaphragm winding, and diaphragm wrinkling. Achieve good electrolyte diffusion performance, eliminate static electricity problems, and improve the effect of absorption capacity

Active Publication Date: 2017-01-04
DONGGUAN AMPEREX TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, the anti-static rod needs to be installed near the winding needle of the winding machine. During the travel and rotation of the winding needle, it may cause the diaphragm to wind or wrinkle, hindering the normal production of winding
The use of anti-static rope may also cause the diaphragm to wrinkle or knot, which will affect the normal operation of the winding machine

Method used

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  • Membrane and secondary battery
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Examples

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Effect test

preparation example Construction

[0041] The present application also relates to the preparation method of the lithium-ion battery diaphragm, at least including the following steps: adding binder, antistatic additive and ceramic material particles to an organic solvent to prepare a coating solution, and coating the coating solution on a substrate and then immersed in the coagulation solution to form a coated substrate, the thickness of the coating is 1-3 μm, and preferably 1.4-2.2 μm.

[0042] This application uses the principle of phase inversion method to prepare the coating of the diaphragm, wherein the coating liquid solvent used is oily, PVDF can be dissolved in the solvent; the coagulation liquid contains non-solvent, PVDF is insoluble in the non-solvent; and the solvent and the non-solvent are mutually soluble . After PVDF is dissolved in an oily solvent, it is mixed with ceramic material particles and antistatic additives to form a coating liquid. The coating solution is coated on the isolation membra...

Embodiment

[0049] 1. Using 2801 type PVDF produced by Arkema Company as a polymer, adding ceramic granular materials and antistatic additives, so that the solid content of the slurry is 18%, and preparing a coating liquid. The parameters of ceramic particle materials and antistatic additives are shown in Table 1;

[0050] Among them, the particle size of ceramic material particles is 2 μm, the particle size of Super P is 60 nm, the length of carbon nanotubes is 100 nm to 10 μm, and the diameter is 20 nm; the diameter of graphene is 3 μm to 60 μm, and the thickness is 0.6 μm to 4 μm;

[0051] 2. Coating the coating solution on a polyolefin porous substrate (produced by Toray, 12 μm thickness, 40% porosity, 250s / 100cc, TN12 for Gurley) with a scraper to form a coating wet film, the thickness of the coating is the same as that of ceramics The ratio of material particles is shown in Table 1;

[0052] 3. Immerse the coating liquid coating / porous substrate into the coagulation liquid containi...

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Abstract

The application relates to the field of secondary batteries and particularly relates to a membrane and a secondary battery thereof. The membrane of the application comprises a base material and a coating adhered to the surface of the base material, wherein the coating contains an anti-static additive, a bonding agent and ceramic material particles; a carbon material is selected as the anti-static additive; the ratio of the thickness of the coating to the median particle diameter of the ceramic material particles is 1 to (0.5-1.5). The coating of the membrane has high porosity, is of a porous configuration with vertical macropores, and has good electrolyte diffusion and pole piece interface bonding force, so that the rigidity and safety performances of a battery core are improved. Since the carbon material is added as the anti-static additive, the electronic conductivity of the coating is improved, the static electricity problem of the coating is eliminated, the electrolyte absorption capacity of the coating can be further improved, and the dynamic performance of the battery core is improved.

Description

technical field [0001] The present application relates to the field of secondary batteries, in particular, to a diaphragm and a secondary battery thereof. Background technique [0002] Secondary batteries, especially lithium-ion secondary batteries, are widely used to power portable electronic devices such as notebook computers, digital cameras, video cameras, and mobile phones due to their high energy density and good rate performance. In recent years, lithium-ion secondary batteries have been widely developed as power supplies for new energy vehicles. In recent years, in order to further increase the energy density, aluminum composite pouch batteries have been used. However, during the cycle, as the charge and discharge progress, a gap will be formed between the electrode and the separator, resulting in a decrease in cycle capacity and affecting life. In order to solve the problem of the gap between the separator and the electrode, a non-aqueous coated separator can be u...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/16H01M50/44
CPCH01M50/409H01M50/431H01M50/44Y02E60/10
Inventor 易建建张磊
Owner DONGGUAN AMPEREX TECH
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