High-temperature-resistant battery diaphragm with anti-wrinkle characteristic, and preparation method and application of high-temperature-resistant battery diaphragm

A high-temperature-resistant battery separator technology, applied in secondary batteries, battery pack components, circuits, etc., can solve problems such as poor wettability of electrolyte, poor battery safety and electrochemical performance, and easy wrinkles. Achieve the effect of excellent electrochemical performance and excellent electrolyte wettability

Inactive Publication Date: 2021-08-10
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to solve the problems of poor overall battery safety and electrochemical performance caused by existing commercial polyolefin battery separators, which are prone to wrinkles, low porosity, and poor electrolyte wettability, and provide a wrinkle-resistant The preparation method of the characteristic high temperature resistant type battery diaphragm

Method used

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  • High-temperature-resistant battery diaphragm with anti-wrinkle characteristic, and preparation method and application of high-temperature-resistant battery diaphragm
  • High-temperature-resistant battery diaphragm with anti-wrinkle characteristic, and preparation method and application of high-temperature-resistant battery diaphragm
  • High-temperature-resistant battery diaphragm with anti-wrinkle characteristic, and preparation method and application of high-temperature-resistant battery diaphragm

Examples

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Effect test

Embodiment 1

[0046] A high-temperature-resistant battery separator with anti-wrinkle properties, the specific preparation method is as follows:

[0047]S1. Preparation of spinning solution: Weighing 0.020mol of diamine monomer (diaminodiphenyl ether) into a 250mL three-necked flask, then adding 50mL of N,N-dimethylformamide solution (DMF), at 0 ℃ under the condition of ice-water bath and continuous feeding of argon protection, stirring for 2h, after it is completely dissolved, add 0.020mol of dianhydride monomer (biphenyltetracarboxylic dianhydride) in three times at 30min / time, in ice bath condition Continue to stir 4h down, obtain polyamic acid (PAA) viscous pale yellow solution, the inorganic nano material SiO that massfraction is 10% 2 Disperse in 25mL of DMF solution, ultrasonic 2h to make it evenly dispersed, the uniformly dispersed SiO 2 The solution was added to the PAA solution and stirred rapidly for 2h to obtain SiO 2 - PAA spinning solution;

[0048] S2. Preparation of SiO b...

Embodiment 2

[0051] A method for preparing a high-temperature-resistant battery separator with anti-wrinkle properties, the specific preparation method is as follows:

[0052] S1. Preparation of spinning solution: Weighing 0.020mol of diamine monomer (diaminodiphenyl ether) into a 250mL three-necked flask, then adding 50mL of N,N-dimethylformamide solution (DMF), at 0 ℃ under the condition of ice-water bath and continuous feeding of argon protection, stirring for 2h, after it is completely dissolved, add 0.020mol of dianhydride monomer (biphenyltetracarboxylic dianhydride) in three times at 30min / time, in ice bath condition Continue to stir 4h down, obtain polyamic acid (PAA) viscous pale yellow solution, the inorganic nano material SiO that massfraction is 1% 2 Disperse in 25mL of DMF solution, ultrasonic 2h, make it evenly dispersed, the uniformly dispersed SiO 2 The solution was added to the PAA solution and stirred rapidly for 2h to obtain SiO 2 - PAA spinning solution;

[0053] S2....

Embodiment 3

[0056] A high-temperature-resistant battery separator with anti-wrinkle properties, the specific preparation method is as follows:

[0057] S1. Preparation of spinning solution: Weighing 0.020mol of diamine monomer (diaminodiphenyl ether) into a 250mL three-necked flask, then adding 50mL of N,N-dimethylformamide solution (DMF), at 0 ℃ under the condition of ice-water bath and continuous feeding of argon protection, stirring for 2h, after it is completely dissolved, add 0.020mol of dianhydride monomer (biphenyltetracarboxylic dianhydride) in three times at 30min / time, in ice bath condition Continue to stir 4h down, obtain polyamic acid (PAA) viscous pale yellow solution, the inorganic nano material SiO that massfraction is 20% 2 Disperse in 25mL of DMF solution, ultrasonic 2h, make it evenly dispersed, the uniformly dispersed SiO 2 The solution was added to the PAA solution and stirred rapidly for 2h to obtain SiO 2 - PAA spinning solution;

[0058] S2. Preparation of spun f...

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Abstract

The invention discloses a high-temperature-resistant battery diaphragm with an anti-wrinkle characteristic, and a preparation method and application of the high-temperature-resistant battery diaphragm. The preparation method comprises the following steps: carrying out in-situ polymerization on a benzene-series diamine monomer and a benzene-series dicarboxylic anhydride monomer in a solvent to form a biphenyl type polyamide acid precursor solution, adding 1-20% by mass of an inorganic nano-material, and uniformly dispersing to obtain a spinning solution; adopting an electrostatic spinning technology to obtain a composite nano spinning film, wherein the spinning voltage is set to be 10-20 kV; and carrying out stepped heating and thermal imidization on the membrane to obtain the composite diaphragm. The prepared battery diaphragm has better wrinkle resistance, high porosity and good electrolyte wettability, and the electrochemical performance of a lithium battery is further improved.

Description

technical field [0001] The invention relates to the field of battery separators, more specifically, to a high-temperature-resistant battery separator with anti-wrinkle properties, a preparation method and application thereof. Background technique [0002] At present, the overall performance of polyolefin separators that are commercially used in lithium-ion batteries is relatively good, but there are still three unresolved shortcomings. Deformation problems such as bending and wrinkles will lead to errors in the use of the battery, causing local short circuits in the battery and affecting the overall safety of the battery; second, the polyolefin separator material itself has a low melting point and poor thermal stability. In the event of battery overheating caused by micro-short circuit or overcharge / overdischarge, the polyolefin separator will heat shrink when it reaches the melting point, and it will no longer be able to play a good barrier role, resulting in direct contact...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M50/403H01M50/423H01M50/44H01M50/446H01M10/0525B82Y30/00B82Y40/00
CPCH01M10/0525B82Y30/00B82Y40/00Y02E60/10
Inventor 邓建辉张国庆杨晓青郭建维曹栋清
Owner GUANGDONG UNIV OF TECH
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