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PVDF ceramic modified diaphragm and preparation method thereof

A ceramic modified layer and ceramic technology, applied in the direction of electrical components, electrochemical generators, circuits, etc., can solve the problem of reducing battery charge and discharge efficiency, cycle life and other performance and safety performance, battery electrical performance and safety performance decline, extreme Solve problems such as poor sheet adhesion, achieve good electrolyte affinity, eliminate the risk of falling off, and achieve the effect of strong adhesion

Inactive Publication Date: 2020-06-02
JIANGSU HORIZON NEW ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Due to the poor electrolyte affinity of the lithium-ion battery diaphragm, poor adhesion to the pole piece, and poor heat resistance, the internal resistance is large during the charging and discharging process of the lithium-ion battery, the diaphragm and the pole piece are easily separated, and internal short circuits are easy to occur. Reduced battery charge and discharge efficiency, cycle life and other performance and safety performance
Most of the industry uses ceramic coatings to increase the heat resistance of the base film and the affinity for the electrolyte, and coating PVDF (polyvinylidene fluoride) coatings on the ceramic coatings to improve the adhesion between the base film and the pole piece, but By accumulating multiple coatings through the binder, when the binder becomes invalid in the electrolyte for a long time, the coating will fall off, and then the electrical performance and safety performance of the battery will be greatly reduced

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] This embodiment 1 provides a PVDF ceramic modified diaphragm, comprising: a base film layer and a PVDF ceramic modified layer positioned on the surface of the base film layer; wherein the PVDF ceramic modified layer is suitable for being grafted to basement membrane surface. The PVDF ceramic modified diaphragm eliminates the risk of peeling off of the PVDF ceramic modified layer by changing the PVDF and ceramics to modify the base film together, and using chemical bonds to connect instead of adhesive bonding.

[0021] Specifically, the base film layer includes a polyolefin diaphragm containing a C-H bond; the cross-linking method includes: the C atom of the C-H bond in the base film layer forms a C-C bond with the C atom in the cross-linking agent; The C atoms in the PVDF ceramic modified layer form C-C bonds with the C atoms in the PVDF ceramic modified layer, that is, the PVDF ceramic modified layer is grafted to the surface of the base film layer; Bond connection to...

Embodiment 2

[0040] This embodiment 2 provides a method for preparing a PVDF ceramic modified diaphragm, including: preparing a PVDF ceramic modified emulsion; coating the PVDF ceramic modified emulsion on the base film, and forming a PVDF ceramic modified layer after drying, thereby obtaining PVDF ceramic modified diaphragm.

[0041] Optionally, the PVDF ceramic modified emulsion includes the following raw materials in parts by mass: PVDF particles: 1-30 parts; ceramic particles: 5-45 parts; crosslinking agent: 0.1-30 parts; solvent: 50-95 parts ; Other additives: 0.1-20 parts. The other auxiliary agents include one or more of dispersants, wetting agents, stabilizers, and defoamers. The raw materials are mechanically mixed and stirred evenly to obtain a PVDF ceramic modified emulsion.

[0042] In this embodiment, the coating method used includes but not limited to top coating, and the top coating process includes but not limited to microgravure coating and dip coating.

[0043] In this...

Embodiment 3

[0045] Mix 1kg of PVDF particles, 10kg of ceramic particles, 30kg of crosslinking agent, 50kg of deionized water, 5kg of dispersant, and 10kg of wetting agent to form a PVDF ceramic modified emulsion. The PVDF ceramic modified emulsion is coated on the base film through a micro-gravure plate, and the PVDF ceramic modified layer is formed after drying to obtain a PVDF ceramic modified diaphragm; the three-dimensional network structure of the PVDF ceramic modified diaphragm has the following characteristics: The porosity of the three-dimensional network structure is 30%, the pore diameter of the three-dimensional network structure is 0.03 μm, and the thickness of the three-dimensional network structure is 0.8 μm.

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Abstract

The invention belongs to the technical field of lithium battery diaphragms, and particularly relates to a PVDF ceramic modified diaphragm and a preparation method thereof. The PVDF ceramic modified diaphragm comprises a base membrane layer and a PVDF ceramic modified layer positioned on the surface of the base membrane layer, wherein the PVDF ceramic modified layer is suitable for being grafted tothe surface of the base membrane layer in a cross-linking manner. According to the PVDF ceramic modified diaphragm and the preparation method thereof, the base membrane is modified by changing PVDF and ceramic, and chemical bond connection is used for replacing adhesive bonding, so that the risk that the PVDF ceramic modified layer falls off is eliminated, the heat resistance, the electrolyte affinity and the bonding force with a pole piece of the modified diaphragm are ensured, and a guarantee is provided for good and stable electrical properties of the lithium ion battery.

Description

technical field [0001] The invention belongs to the technical field of lithium battery diaphragms, and in particular relates to a PVDF ceramic modified diaphragm and a preparation method thereof. Background technique [0002] Lithium-ion batteries are more and more widely used in power fields, such as electric vehicles; in 3C fields, such as mobile phones and tablet computers; in the field of power tools, such as various hand-held power tools. With the expansion of the application range, the market has higher and higher requirements for the performance of lithium-ion batteries, which in turn puts forward higher requirements for lithium-ion battery separators. [0003] Due to the poor electrolyte affinity of the lithium-ion battery diaphragm, poor adhesion to the pole piece, and poor heat resistance, the internal resistance is large during the charging and discharging process of the lithium-ion battery, the diaphragm and the pole piece are easily separated, and internal short...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/14H01M2/16H01M10/0525
CPCH01M10/0525H01M50/403H01M50/446Y02E60/10
Inventor 张立斌李正林贡晶晶翁星星张翰林
Owner JIANGSU HORIZON NEW ENERGY TECH CO LTD
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