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Polyimide composite diaphragm, preparation method thereof and lithium ion battery

A technology of polyimide-based film and composite diaphragm, which is applied in the direction of secondary batteries, battery pack components, circuits, etc., can solve the problems of poor electrolyte wettability and poor heat resistance in liquid retention rate, and improve cycle stability And the effects of service life, improved safety, and simple preparation method

Pending Publication Date: 2022-04-19
EVE ENERGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the traditional polyolefin separator has the problems of poor heat resistance, poor liquid retention rate and electrolyte wettability, so it is necessary to develop a high-performance lithium-ion battery separator

Method used

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  • Polyimide composite diaphragm, preparation method thereof and lithium ion battery
  • Polyimide composite diaphragm, preparation method thereof and lithium ion battery
  • Polyimide composite diaphragm, preparation method thereof and lithium ion battery

Examples

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Embodiment 1

[0089] This embodiment provides a polyimide composite diaphragm, which includes a polyimide base film, a ceramic coating coated on one side of the polyimide base film, and a coating a meta-aramid polymer coating on the other side of the polyimide base film. The thickness of the polyimide composite diaphragm is 6 μm, the thickness of the ceramic coating is 2 μm, the thickness of the polymer coating is 2 μm, and the meta-aramid fiber glass in the meta-aramid coating The transition temperature is 400°C.

[0090] The preparation method comprises the following steps:

[0091] (1) will D 10 Particle size is 0.3μm, D 50 Particle size is 0.6μm, D 90 The particle size is 1.3μm and the specific surface area is 7m 230g boehmite (purity is 99.95%) and 45g deionized water per gram are stirred at high speed, the speed of stirring is 1000rpm, the time of stirring is 4h, and after stirring for 6h in the mode of magnetic stirring, ultrasonic dispersion 1h, at 30 After heating at ℃ for 0....

Embodiment 2

[0095] This embodiment provides a polyimide composite diaphragm, which includes a polyimide base film, a ceramic coating coated on one side of the polyimide base film, and a coating a meta-aramid polymer coating on the other side of the polyimide base film. The thickness of the polyimide composite diaphragm is 8 μm, the thickness of the ceramic coating is 2.5 μm, the thickness of the polymer coating is 2.5 μm, and the meta-aramid in the meta-aramid coating The glass transition temperature is 320°C.

[0096] The preparation method comprises the following steps:

[0097] (1) will D 10 Particle size is 0.35μm, D 50 Particle size is 0.65μm, D 90 The particle size is 1.35μm and the specific surface area is 7.5m 2 35g boehmite / g and 70g deionized water were stirred at a high speed, the stirring rate was 1000rpm, the stirring time was 6h, and then stirred by magnetic stirring for 6h, ultrasonically dispersed for 1h, and heated at 35°C for 1.5h to After dissolving, add 2.5g prop...

Embodiment 3

[0101] This embodiment provides a polyimide composite diaphragm, which includes a polyimide base film, a ceramic coating coated on one side of the polyimide base film, and a coating a meta-aramid polymer coating on the other side of the polyimide base film. The thickness of the polyimide composite diaphragm is 10 μm, the thickness of the ceramic coating is 2.2 μm, the thickness of the polymer coating is 2.2 μm, and the meta-aramid fiber in the meta-aramid coating The glass transition temperature is 260°C.

[0102] The preparation method comprises the following steps:

[0103] (1) will D 10 Particle size is 0.32μm, D 50 Particle size is 0.62μm, D 90 The particle size is 1.32μm and the specific surface area is 7.2m 2 20g alumina per gram and 60g deionized water were stirred at a high speed, the stirring rate was 800rpm, the stirring time was 9h, and then stirred by magnetic stirring for 6h, ultrasonically dispersed for 1h, heated at 20°C for 3h until dissolved Then add 1g ...

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Abstract

The invention provides a polyimide composite diaphragm, a preparation method thereof and a lithium ion battery. The polyimide composite diaphragm comprises a polyimide base membrane, a ceramic coating and a polymer coating, wherein one side of the polyimide base membrane is coated with the ceramic coating, and the other side of the polyimide base membrane is coated with the polymer coating. According to the polyimide composite diaphragm provided by the invention, the surface of the polyimide base diaphragm is respectively coated with the ceramic coating and the polymer coating, the thermal stability of the diaphragm can be improved by the coated polymer coating, and the mechanical strength of the diaphragm is improved by adding the ceramic coating; the polyimide composite diaphragm has better air permeability, heat-resistant stability, high ionic conductivity, electrolyte wettability and electrolyte retention rate, so that the cycle life of the lithium ion battery is prolonged, and the safety performance of the lithium ion battery is improved.

Description

technical field [0001] The invention belongs to the field of battery materials, and in particular relates to a polyimide composite diaphragm, a preparation method thereof, and a lithium ion battery. Background technique [0002] With the development of electronic equipment and electric vehicle industries, ceramic coated separators are widely used in the field of electric vehicle batteries. In the structure of lithium-ion batteries, the lithium-ion battery separator, as one of the main components, can play the role of isolating the positive and negative electrodes and allowing lithium ions to be transported between the positive and negative electrodes. The performance of the lithium-ion battery separator determines the performance of the battery. The interface structure, internal resistance and thermal stability, etc., and directly affect the capacity, cycle life and safety of the battery, avoiding thermal runaway, lithium dendrites and short circuits and other safety hazards...

Claims

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Application Information

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IPC IPC(8): H01M50/423H01M50/414H01M50/434H01M50/457H01M50/403H01M10/0525
CPCH01M50/423H01M50/414H01M50/434H01M50/457H01M50/403H01M10/0525Y02E60/10
Inventor 黄佳苑冀亚娟黎中利
Owner EVE ENERGY CO LTD
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