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Pressure-sensitive polymer modified diaphragm as well as preparation method and application thereof

A pressure-sensitive polymer, a technology of sensitive polymer, applied in the field of pressure-sensitive polymer modified diaphragm and its preparation, can solve the problems of restricting the popularization and use of energy storage batteries, increasing battery impedance, unable to meet the development requirements of energy storage batteries, etc.

Active Publication Date: 2021-08-06
XIAMEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, during the production process of the battery, the residual gas in the battery causes the electrode and the diaphragm to be not tightly bonded, and the impedance of the battery becomes larger, and the cycle performance and cycle life of the entire battery are greatly reduced. Obviously, this cannot meet the needs of more energy storage batteries. The development requirements of long cycle life limit the further promotion and use of energy storage batteries

Method used

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  • Pressure-sensitive polymer modified diaphragm as well as preparation method and application thereof
  • Pressure-sensitive polymer modified diaphragm as well as preparation method and application thereof
  • Pressure-sensitive polymer modified diaphragm as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0061] Step 1, preparing an ordinary ceramic diaphragm: fully mix silica spherical powder with a particle size of about 300nm, and a binder (styrene-butadiene rubber (SBR), carboxymethyl cellulose (CMC)) to form a slurry, which The mass ratio is: silicon dioxide / SBR / CMC=0.95g / 0.03g / 0.02g, the solvent is a water / ethanol mixture with a volume ratio of 1:1, and the mass ratio of liquid to solid is 90:10. The prepared slurry was uniformly coated on both sides on a commercial organic microporous polyethylene (PE) separator with an automatic coating machine, and after drying at room temperature, it was dried in vacuum at 50°C for 10 hours to obtain a silica ceramic coated separator. .

[0062] Step 2, preparing a high-temperature-resistant ceramic diaphragm: using a water / ethanol mixture with a volume ratio of 1:1 as a solvent, and preparing a 50 g / L phenolic resin solution with a molecular weight of 1000. Pour the previously prepared silica ceramic-coated diaphragm into the above-...

Embodiment 2

[0067] Step 1, preparing a common ceramic diaphragm: fully mix aluminum oxide powder with a particle size of about 200nm, binder (polyvinylidene fluoride), and solvent NMP to make a slurry, and its mass ratio is: aluminum oxide / polyvinylidene fluoride / NMP=0.80g / 0.05g / 0.15g, the prepared slurry is evenly double-sidedly coated on a commercial polyethylene (PE) diaphragm with an automatic coating device, after room temperature drying, 50 °C and vacuum-dried for 10 hours to obtain an aluminum oxide ceramic-coated separator.

[0068] Step 2, preparing a pressure-sensitive polymer composite diaphragm: dissolving 5.4 g of natural rubber in 17.5 g of toluene solvent, stirring on a magnetic stirrer for 24 hours, and ultrasonicating for 10 minutes to remove air bubbles. The obtained natural rubber solution is uniformly coated on both sides of a 20cm×6m aluminum oxide diaphragm on a small coating machine to obtain a common ceramic diaphragm composed of a pressure-sensitive polymer.

[...

Embodiment 3

[0072] Preparation of a pressure-sensitive polymer composite diaphragm: 5.4 g of natural rubber was dissolved in 17.5 g of toluene solvent, stirred on a magnetic stirrer for 24 h, and ultrasonicated for 10 min to remove air bubbles. The obtained natural rubber solution is uniformly coated on both sides on a 20cm×6m organic microporous polyethylene diaphragm on a small coating machine to obtain a pressure-sensitive polymer-composite ordinary polyethylene diaphragm.

[0073] Table 1 The conductivity and air permeability comparison table of various separators

[0074] project Example 1 Example 2 PE diaphragm Comparative example 2 Comparative example 3 Porosity 42％ 41％ 43％ O％ 0％ Ionic conductivity ms / cm 0.684 0.536 0.756 - - Air permeability s / 100mL 395 389 375 gigantic gigantic

[0075] As can be seen from the above table, the porosity, electrical conductivity, and air permeability of the composite diaphragm after coating th...

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Abstract

The invention discloses a pressure-sensitive polymer composite diaphragm as well as a preparation method and application thereof. A pressure-sensitive polymer layer is formed on the surface of a base material of the pressure-sensitive polymer composite diaphragm by coating, spraying or electrospinning a solution of a pressure-sensitive polymer material; the thickness of the pressure-sensitive polymer layer is 0.5 nm to 1 [mu] m; the pressure-sensitive polymer material comprises an elastomer type pressure-sensitive polymer and a resin type pressure-sensitive polymer; the elastomer pressure-sensitive polymer material comprises natural rubber and synthetic rubber; and the resin type pressure-sensitive polymer material comprises polyurethane, polyhalogenated olefin and derivatives thereof, organic silicon resin, fluororesin and polyacrylate. The problem that battery circulation is affected by residual gas due to poor adhesion between the diaphragm of the battery and the positive and negative electrodes is solved, so that the battery circulation performance is improved, and the battery circulation life is prolonged. The pressure-sensitive polymer of the diaphragm provided by the invention is suitable for compounding an existing diaphragm, and is very suitable for application scenarios requiring high safety characteristic and high energy storage performance.

Description

technical field [0001] The invention belongs to the technical field of new energy, and in particular relates to a pressure-sensitive polymer modified diaphragm and its preparation method and application. Background technique [0002] As a chemical power system with high energy density, high output voltage, no memory effect, excellent cycle performance, and environmental friendliness, lithium-ion battery has good economic benefits, social benefits and strategic significance, and has been widely used in mobile communications, Digital products and other fields, and it is very likely to become the most important power supply system in the field of energy storage and electric vehicles. [0003] The separator is a microporous film placed between the positive and negative electrodes of the battery, through which ions can pass freely while blocking the direct contact between the positive and negative electrodes. [0004] However, during the production process of the battery, the re...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M50/449H01M50/414H01M50/417H01M50/434H01M50/403H01M10/0525
CPCH01M10/0525Y02E60/10
Inventor 赵金保刘一铮张鹏
Owner XIAMEN UNIV
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