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Mixed coating diaphragm and preparation method and application thereof

A polymer coating and coating technology, which is applied in the direction of hybrid capacitor separators, electrical components, circuits, etc., can solve the problems of insufficient liquid absorption rate and heat resistance of the diaphragm, and achieve simple preparation methods, easy industrialization, Effect of improving specific discharge capacity

Inactive Publication Date: 2017-05-10
NINGBO CRRC NEW ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The coating surface of the diaphragm made by this patent is smooth, has high air permeability, and has good mechanical properties and thermal shrinkage at the same time, but the diaphragm made of this patent has only ceramic coating, no polymer coating, and the liquid absorption of the diaphragm Insufficient performance such as high efficiency and heat resistance, mainly used in lithium batteries

Method used

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  • Mixed coating diaphragm and preparation method and application thereof
  • Mixed coating diaphragm and preparation method and application thereof
  • Mixed coating diaphragm and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Weigh 2g of CMC, use 100g of deionized water as the dispersion medium, and stir under vacuum conditions to prepare a dispersion glue. Weigh 15g of 50nm aluminum oxide in the dispersion glue, and vacuum stir to obtain a ceramic slurry. Then, the ceramic slurry is coated on both sides of a 10 μm PP / PE base film by a micro-gravure coating method, and dried to obtain a ceramic particle-coated separator, and the thickness of the single-sided coating of the ceramic particles is controlled at 2 μm.

[0041] Weigh 6g of PVDF in 30g of NMP and stir under vacuum to obtain PVDF glue. Then, PVDF glue is coated on both sides of the above-mentioned ceramic particle-coated diaphragm by dip coating, and dried. The thickness of the single-sided coating of PVDF is 4 μm, and finally cut to form a mixed-coated diaphragm. Mixed coating The structure of the membrane is as figure 1 shown.

Embodiment 2

[0043] Weigh 4g of LA133, use 100g of deionized water as the dispersion medium, and stir under vacuum conditions to prepare a dispersion glue. Weigh 20g of 100nm silica into the dispersion glue, and vacuum stir to obtain a ceramic slurry. Then, the ceramic slurry was coated on one side of the 10 μm PP base film by brushing, and dried to obtain a ceramic particle-coated diaphragm, and the coating thickness of the ceramic particle was controlled at 4 μm.

[0044] Weigh 3g of P(VDF-HFP) and 2g of PVDF in 60g of NMP, and stir under vacuum to obtain a mixed glue of PVDF and P(VDF-HFP). Then, the mixed glue is coated on the other side of the ceramic particle coating diaphragm made above by spraying method, and dried. The thickness of the mixed coating of PVDF and P(VDF-HFP) is 4 μm, and finally cut into a mixed Coated separators, hybrid coated separators have a structure such as figure 2 shown.

Embodiment 3

[0046] Weigh 3g of Gelatin, use 10g of deionized water as the dispersion medium, and stir under vacuum conditions to prepare a dispersion glue, weigh 10g of 80nm silicon dioxide and 10g of 50nm titanium dioxide in the dispersion glue, and stir in vacuum to obtain a mixed ceramic slurry. Then, the mixed ceramic slurry is coated on one side of the 20 μm PP / PE / PP base film by brushing method, and dried to obtain a ceramic particle-coated diaphragm, and the coating thickness of the ceramic particle is controlled at 2 μm.

[0047] Weigh 3g of P(VDF-HFP) and 3g of P(VDF-TrFE) in 80g of NMP, and stir under vacuum to obtain a mixed glue of P(VDF-TrFE) and P(VDF-HFP). Then, the mixed glue solution is coated on both sides of the above-mentioned ceramic particle coating diaphragm by spraying method, and dried. The thickness of the single side of the mixed coating of P (VDF-TrFE) and P (VDF-HFP) is 2 μm, and finally divided Cut into a hybrid coated separator, the structure of the hybrid ...

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Abstract

The invention relates to a mixed coating diaphragm and a preparation method and an application thereof, and belongs to the technical field of an energy storage element. The mixed coating diaphragm comprises a base film, a ceramic granule coating layer and a polymer coating layer, wherein the ceramic granule coating layer is formed on one or two sides of the base film; and the polymer coating layer is formed on the base film and / or the ceramic granule coating layer. By forming the ceramic granule coating layer and the polymer coating layer on the base film concurrently, the mixed coating diaphragm provided by the invention obtains safety of a pure ceramic coating diaphragm as well as obtains advantages of a fluorine-containing polymer coating diaphragm, so that the wettability, ionic conductivity, high-temperature resistance, cycle life, rate capability and the like of the diaphragm can be improved; and when the mixed coating diaphragm is applied to a battery capacitor or a lithium ion battery, the discharge specific capacity, the cycle life and the safety of the battery capacitor or the lithium ion battery can be effectively improved.

Description

technical field [0001] The invention relates to a diaphragm, in particular to a hybrid coating diaphragm coated with ceramic particles and a polymer, a preparation method and application thereof, and belongs to the technical field of energy storage elements. Background technique [0002] Battery capacitor is a new type of energy storage component. It is composed of lithium-ion battery active materials and super capacitor active materials as electrode materials. Therefore, it has both the high energy density of lithium-ion batteries and the high power density and long cycle of super capacitors. The characteristics of life can meet the development of hybrid electric vehicles. [0003] Like lithium-ion batteries, battery capacitors are mainly composed of five parts: positive electrode materials, negative electrode materials, electrolytes, separators, and packaging materials. Among them, the separators generally use polyolefin separators for lithium-ion batteries. The separator...

Claims

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Application Information

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IPC IPC(8): H01M2/14H01M2/16H01G11/52
CPCH01G11/52H01M50/403H01M50/449Y02E60/10Y02E60/13
Inventor 阮殿波李林艳周洲乔志军黄益
Owner NINGBO CRRC NEW ENERGY TECH CO LTD
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