A functionalized polyolefin composite diaphragm and its preparation method and application

A technology of polyolefin diaphragm and composite diaphragm, applied in nanotechnology, structural parts, electrical components, etc. for materials and surface science, can solve problems such as poor thermal stability and poor wettability of electrolyte, and achieve strong mechanical strength, electrical Improvement of chemical properties and improvement of thermal stability

Active Publication Date: 2022-02-01
NORTHEAST NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to solve the shortcomings of traditional polyolefin diaphragms such as poor dimensional thermal stability and poor electrolyte wettability. The present invention provides a functionalized polyolefin composite diaphragm and its preparation method and application, which have excellent thermal stability, A composite separator with excellent comprehensive performance with improved mechanical strength, good electrolyte wettability and improved electrochemical performance

Method used

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  • A functionalized polyolefin composite diaphragm and its preparation method and application
  • A functionalized polyolefin composite diaphragm and its preparation method and application
  • A functionalized polyolefin composite diaphragm and its preparation method and application

Examples

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Embodiment 1

[0036](1) Preparation of coating solution:

[0037] 4g of polyvinyl alcohol (PVA) and 96ml of deionized water were respectively added into a three-necked flask, and stirred under reflux at 90° C. for 4 hours to obtain a PVA aqueous solution with a mass concentration of 4%. Aqueous hydroxylated carbon nanotubes (CNT-OH) and deionized water were mixed to form a 5% CNT-OH solution. 1g nano-SiO 2 and 0.3 g of 5% CNT-OH solution were added to 13.7 g of PVA aqueous solution, ultrasonicated and stirred for 0.5 h to obtain a coating solution with a CNT-OH content of 0.1%.

[0038] (2) Lithium salt modified polyolefin diaphragm:

[0039] Add lithium bistrifluoromethanesulfonimide (LiTFSI) to ethanol to prepare a LiTFSI / ethanol solution with a mass concentration of 2%. The PE diaphragm was first cleaned by ethanol ultrasonic cleaning and then vacuum-dried at 40°C and then placed in LiTFSI / ethanol solution. Soak in ethanol solution for 30min, then vacuum dry at 40°C for 24h to obtain ...

Embodiment 2

[0047] (1) Preparation of coating solution:

[0048] 4g of PVA and 96ml of deionized water were respectively placed in a three-necked flask, refluxed and stirred at 90° C. for 4 hours to obtain a 4% mass concentration of PVA aqueous solution, aqueous CNT-OH and deionized water were made into a 5% CNT-OH solution, and 1g nano-SiO 2 and 0.9 g of 5% CNT-OH solution were added to 13.1 g of PVA aqueous solution, ultrasonicated and stirred for 0.5 h to obtain a coating solution with a CNT-OH content of 0.3%.

[0049] (2) Lithium salt modified polyolefin diaphragm:

[0050] Add lithium bistrifluoromethanesulfonylimide (LiTFSI) to ethanol to prepare a LiTFSI / ethanol solution with a mass concentration of 2%. The PE diaphragm is ultrasonically cleaned with ethanol, dried in vacuum at 40°C and placed in LiTFSI / ethanol solution Soak in medium for 30min, then vacuum dry at 40°C for 24h to obtain lithium salt modified polyolefin separator.

[0051] (3) Preparation of PE@LiSiCNT0.3 compos...

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Abstract

The invention provides a functionalized polyolefin composite diaphragm and its preparation method and application. The functionalized polyolefin composite diaphragm of the present invention is composed of carbon nanotubes, lithium salts, inorganic nano-silicon dioxide and polyolefin components. The invention provides The preparation method of the composite separator is as follows: the binder and the solution of functionalized carbon nanotubes are mixed with nano-silica to obtain a coating solution, and then the polyolefin separator is placed in an ethanol solution of lithium salt to obtain a lithium salt-modified polyolefin membrane. Olefin separator, and then the coating solution is evenly coated on the lithium salt modified polyolefin separator, and then after vacuum drying, functionalized carbon nanotubes and lithium salt coated polyolefin separator are obtained. The prepared separator has excellent mechanical properties Strength, high stability, high active surface area, good electrolyte wettability, excellent lithium ion conductivity and electrochemical performance, can be well used in the field of lithium ion batteries.

Description

technical field [0001] The invention belongs to the field of lithium-ion batteries, and in particular relates to a functionalized polyolefin composite diaphragm, a preparation method and application thereof, and an application of the functionalized polyolefin composite diaphragm in lithium-ion batteries. [0002] technical background [0003] Lithium-ion batteries (LIBs) have the advantages of high operating voltage, high energy density, and long service life, and are a promising power source for mobile devices and large-scale power storage applications such as smart grids and electric vehicles. However, inherent safety and efficiency issues of traditional materials used to fabricate LIBs limit their further applications. LIBs are composed of four main components: cathode, electrolyte, separator, and anode. The separator located between the positive and negative electrodes is an important part of LIBs, which is an ion conductor and an electronic insulator, and plays a key ro...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M50/403H01M50/417H01M50/446H01M50/449B82Y30/00
CPCB82Y30/00Y02E60/10
Inventor 呼微王宇粮谢海明朱广山
Owner NORTHEAST NORMAL UNIVERSITY
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