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Lithium battery diaphragm

A battery diaphragm and diaphragm technology, which is applied in the direction of lithium batteries, battery pack components, non-aqueous electrolyte batteries, etc., can solve problems such as weak binding force, achieve the effects of increasing service life, promoting rapid fusion, and ensuring service life

Inactive Publication Date: 2018-07-06
成都格力钛新能源有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is to overcome the defects of the weak bonding force between the conductive coating and the ceramic coating of the battery diaphragm for lithium batteries in the prior art and the diaphragm matrix, and then provide a method that can simultaneously enhance the electrical conductivity and mechanical properties. And heat-resistant performance as an organic battery separator

Method used

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  • Lithium battery diaphragm

Examples

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Effect test

Embodiment 1

[0041] The battery separator provided in this example adopts vinylidene fluoride-hexafluoropropylene copolymer (PVDF-HFP) as the material of the membrane base, and there are conductive layers and reinforcing layers on both sides of the membrane base, wherein conductive layers are dispersed in the conductive layer. Particle acetylene black, particle reinforcement nano-alumina is dispersed in the reinforcement layer. Both the conductive layer and the reinforcement layer of this battery separator had a thickness of 15 μm, and the thickness of the center portion was 25 μm.

[0042] The improved battery separator provided in this example is prepared by the following steps:

[0043] Dissolve 5g of PVDF-HFP in 200mL of acetone, heat, seal and stir until PVDF-HFP is completely dissolved, then use an automatic film applicator to coat a glass plate, and dry it in an oven at 110°C to obtain a PVDF-HFP base film ;

[0044] Dissolve 2g of PVDF-HFP in 200mL of acetone, heat, seal and stir...

Embodiment 2

[0048] The battery separator provided in this example adopts polyvinylidene fluoride as the material of the membrane substrate, and there are conductive layers and reinforcing layers on both sides of the membrane substrate, wherein conductive carbon black is dispersed in the conductive layer, and particle reinforcement is dispersed in the reinforcing layer. bulk titanium dioxide. In this battery separator, the thickness of the conductive layer was 10 μm, the thickness of the reinforcing layer was 25 μm, and the thickness of the center portion was 20 μm.

[0049] The improved battery separator provided in this example is prepared by the following steps:

[0050] Dissolve 5g of polyvinylidene fluoride (PVDF) in 200mL of N-methylpyrrolidone, heat, seal and stir until PVDF is completely dissolved, then use an automatic film applicator to coat a glass plate, and dry it in an oven to obtain PVDF basement membrane;

[0051] Dissolve 2g of PVDF in 200mL of N-methylpyrrolidone, heat,...

Embodiment 3

[0055] The battery separator provided in this embodiment adopts polyvinylpyrrolidone (PVP) as the material of the film base, and there are conductive layers and reinforcing layers on both sides of the film base, wherein carbon nanotubes are dispersed in the conductive layer, and carbon nanotubes are dispersed in the reinforcing layer. Granular reinforced silica. In this battery separator, the thickness of the conductive layer was 25 μm, the thickness of the reinforcing layer was 25 μm, and the thickness of the central portion was 50 μm.

[0056] The improved battery separator provided in this example is prepared by the following steps:

[0057] Dissolve 5g of PVP in 200mL of N-methylpyrrolidone, heat, seal and stir until the PVP is completely dissolved, then use an automatic film applicator to coat a glass plate, and dry it in an oven to obtain a PVP base film;

[0058] Dissolve 2g of PVP in 200mL of N-methylpyrrolidone, heat and seal it and stir until the PVP is completely d...

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Abstract

The invention belongs to the technical field of lithium batteries, and particularly relates to a battery diaphragm. The invention creatively and firstly provides the battery diaphragm organically integrating improved conductivity, puncture resistance and heat stability. The battery diaphragm comprises a diaphragm base layer, and a conductive layer and a reinforcement layer that are located on thetwo sides of the diaphragm base layer, wherein a layer matrix of the conductive layer, a layer matrix of the reinforcement layer and the diaphragm base layer are a whole; an internal interface does not exist; and the problem of influence on a battery life due to falling-off of the conductive layer and the reinforcement layer in a composite diaphragm in the prior art is avoided.

Description

technical field [0001] The invention belongs to the technical field of lithium batteries, and in particular relates to a battery diaphragm. Background technique [0002] Lithium batteries include lithium-sulfur batteries that are currently a research hotspot and lithium-ion batteries that have been widely used, both of which are composed of positive electrodes, negative electrodes, separators and electrolytes. The diaphragm used in lithium batteries has a microporous structure, which allows lithium ions to pass through smoothly but electrons cannot pass through. It is the movement of lithium ions between the positive and negative electrodes that realizes the charging and discharging of the battery. Performance and security have very important implications. [0003] Excellent separators for lithium batteries require good electrolyte wettability, and the existing lithium battery separators are usually made of insulating polymers, which often have weak wettability to the elect...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/16H01M2/14H01M10/052H01M50/403H01M50/451H01M50/457H01M50/489
CPCH01M10/052H01M50/403H01M50/446Y02E60/10
Inventor 李静国海超
Owner 成都格力钛新能源有限公司
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