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Functionalized polyolefin composite diaphragm and preparation method and application thereof

A technology of polyolefin diaphragm and composite diaphragm, which is applied in nanotechnology for materials and surface science, electrical components, nanotechnology, etc., and can solve problems such as poor thermal stability and poor wettability of electrolyte

Active Publication Date: 2020-09-29
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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  • Functionalized polyolefin composite diaphragm and preparation method and application thereof
  • Functionalized polyolefin composite diaphragm and preparation method and application thereof
  • Functionalized polyolefin composite diaphragm and preparation method and application thereof

Examples

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Embodiment 1

[0036] (1) Preparation of coating liquid:

[0037] 4g of polyvinyl alcohol (PVA) and 96ml of deionized water were added to a three-necked flask, and stirred at 90°C for 4 hours under reflux to obtain a 4% mass concentration PVA aqueous solution. Mix water-based hydroxylated carbon nanotubes (CNT-OH) and deionized water 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] Lithium bis(trifluoromethylsulfonyl)imide (LiTFSI) was added to ethanol to prepare a LiTFSI / ethanol solution with a mass concentration of 2%. The PE diaphragm was first ultrasonically cleaned with ethanol, then dried in a vacuum at 40°C and placed in LiTFSI / Soaking in ethanol solution for 30 minutes, and vacuum drying at 40°C for 24 hours to obtain lithium salt modified polyolefin membr...

Embodiment 2

[0047] (1) Preparation of coating liquid:

[0048] Place 4g PVA and 96ml deionized water in a three-necked flask, reflux and stir at 90°C for 4h to obtain a 4% mass concentration PVA aqueous solution. Mix the aqueous CNT-OH and deionized water into a 5% CNT-OH solution. 1g nano SiO 2 Adding 0.9 g of 5% CNT-OH solution into 13.1 g of PVA aqueous solution, ultrasonic and stirring 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] Lithium bis(trifluoromethylsulfonyl)imide (LiTFSI) was added to ethanol to prepare a LiTFSI / ethanol solution with a mass concentration of 2%. The PE diaphragm was ultrasonically cleaned with ethanol, dried in a vacuum at 40°C and placed in the LiTFSI / ethanol solution Soaked in medium for 30min, and dried in vacuum at 40℃ for 24h to obtain lithium salt modified polyolefin membrane.

[0051] (3) Preparation of PE@LiSiCNT0.3 composite membrane:

[0052] Spread the lithium salt-mod...

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Abstract

The invention provides a functionalized polyolefin composite diaphragm and a preparation method and an application thereof. The functionalized polyolefin composite diaphragm disclosed by the inventionis composed of carbon nanotubes, lithium salt, inorganic nano silicon dioxide and polyolefin components. The preparation method comprises the following steps of mixing solution of binder and the functionalized carbon nanotubes with the nano silicon dioxide to obtain coating solution, putting a polyolefin diaphragm into ethanol solution of lithium salt to obtain a lithium salt modified polyolefindiaphragm, then uniformly coating the lithium salt modified polyolefin diaphragm with the coating liquid. The method is advantaged in that the prepared diaphragm has advantages of excellent mechanicalstrength, high stability, high active surface area, good electrolyte wettability, excellent lithium ion conduction capability and excellent electrochemical performance, and can be well applied to thefield of lithium ion batteries.

Description

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

Claims

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Application Information

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IPC IPC(8): H01M2/14H01M2/16B82Y30/00
CPCB82Y30/00Y02E60/10
Inventor 呼微王宇粮谢海明朱广山
Owner NORTHEAST NORMAL UNIVERSITY
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