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Polymer composite diaphragm and its preparing method

A composite membrane and polymer technology, applied in textiles and papermaking, structural parts, electrical components, etc., can solve serious problems, difficult recycling, environmental pollution and other problems

Inactive Publication Date: 2006-10-25
PEKING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method requires a large amount of extractant, which is not easy to recycle, increases the cost, and causes serious environmental pollution.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Example 1. Preparation of polymer composite diaphragm with PVDF and PEG as matrix membrane reinforcement

[0028] The polymer PVDF and PEG are used as the matrix membrane reinforcement, and the nano-SiO 2 For ion conductivity enhancer, polymer electrolyte composite membrane is prepared according to the following method:

[0029] The PP non-woven fabric with a thickness of 90-150 μm is cleaned and densified (flat or rolled) to obtain a 30 μm film as the base film; 3 parts by weight of polyvinylidene fluoride (PVDF) and 1 part by weight of polyethylene glycol (PEG) is dissolved in 35 parts by weight of butanone at room temperature to form a solution, and then 5 parts by weight of diethyl carbonate (DEC) is added to the solution and stirred to form solution A; in addition, 1 part by weight of nano-SiO 2 (the particle diameter is between 3-15nm, and the average particle diameter is 5nm) is uniformly dispersed in the mixed solution of 30 parts by weight butanone and 25 parts ...

Embodiment 2

[0035] Embodiment 2, using PVDF-HFP (weight average molecular weight 250,000), PEG (weight average molecular weight 20,000), MMA and thermal initiator BPO as matrix membrane reinforcement to prepare polymer composite diaphragm

[0036] The matrix membrane is reinforced with polymer components [PVDF-HFP (weight average molecular weight: 250,000) and PEG (weight average molecular weight: 20,000)], organic monomer (MMA) and thermal initiator (benzoyl peroxide, BPO). Body, with an average particle size of 5nm TiO 2 For ion conductivity enhancer, polymer electrolyte composite membrane is prepared according to the following method:

[0037] The PP non-woven fabric with a thickness of 40-50 μm is cleaned and compacted (flat pressing or rolling) to obtain a 30 μm film as the base film; 3 parts by weight of poly(vinylidene fluoride-hexafluoropropylene) and 1 part by weight of polyethylene glycol (PEG, 10 million weight average molecular weight) is dissolved in 40 parts by weight of bu...

Embodiment 3

[0039] Example 3, using PVDF-HFP and PMMA as matrix membrane reinforcement to prepare polymer composite diaphragm

[0040] The polymer component (PVDF-HFP and PMMA) is used as the matrix membrane reinforcement, and the nanometer BaTiO 3 As an ion conductivity enhancer, the polymer electrolyte composite diaphragm is prepared according to the following method:

[0041] Thickness is the PE non-woven fabric of 40-50 μ m after washing and densification according to the method of example 2 to obtain 30 μ m film as base film; The mixture (PVDF-HFP:PMMA=3:1, weight ratio) was dissolved in 40 parts by weight of acetone at room temperature to form solution A, and 1 part by weight of nanometer BaTiO 3 (The particle size is between 10-50nm, the average particle size is 30nm) blending and dispersing evenly in a mixed solution of 30 parts by weight of methyl ethyl ketone and 25 parts by weight of butanol to form solution B, then mixing solutions A and B, and then dispersing 1-4h to obtain...

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Abstract

This invention discloses a polymer compound membrane and its preparation method, in which, the method includes: mixing strengthening bodies of a matrix film and inorganic nm materials in an organic solvent to get a uniform slurry to be coated on both sides of a non-woven cloth to get a polymer compound membrane, in which, said strengthening bodies are selected from the following three: 1, an organic monomer and its related initiator, 2, two or more than two polymers, 3, organic monomers and their related initiators and two or more than two polymers, 4, organic monomers and two or more than two polymers.

Description

technical field [0001] The invention relates to a polymer composite diaphragm and a preparation method thereof. Background technique [0002] Liquid lithium-ion battery is a new type of secondary battery after Ni-H, Ni-Cd and lead-acid secondary batteries. In the development process of nearly 20 years, due to its inherent advantages such as single battery voltage High platform, friendly to the environment, high weight-to-energy ratio and no memory effect, etc., have enabled the rapid development of liquid lithium-ion batteries. Polymer lithium-ion batteries are a new generation of battery products after liquid lithium-ion batteries. In polymer lithium-ion battery components, except for packaging methods, polymer electrolyte membranes are the most obvious difference between polymer batteries and liquid lithium-ion battery materials. , so it is also the top priority of the research. In addition to separating the positive and negative electrodes and providing lithium ion chan...

Claims

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Application Information

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IPC IPC(8): C08J5/22D06N3/04D06N3/12H01M50/446
CPCY02E60/10
Inventor 陈继涛刘红英徐斌
Owner PEKING UNIV
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