Composite diaphragm as well as preparation method and application thereof

A composite diaphragm and diaphragm material technology, applied in the field of lithium-ion batteries, can solve the problems of increasing the manufacturing cost of ceramic diaphragms, high toxicity of organic solvents, flammable and volatile safety, etc.

Inactive Publication Date: 2014-09-24
XIAMEN UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The binder is mainly a polymer compound, such as polyvinylidene fluoride (PVDF), polyvinylidene fluoride-hexafluoropropylene copolymer (PVDF-HFP), polymethyl methacrylate (PMMA), etc., so a large amount of Organic solvents increase the manufacturing cost of ceramic diaphragms, and organic solvents are relatively toxic, flammable and volatile, causing safety hazards

Method used

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  • Composite diaphragm as well as preparation method and application thereof
  • Composite diaphragm as well as preparation method and application thereof
  • Composite diaphragm as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] The mass ratio of the synthesized alumina nanoparticles to sodium carboxymethylcellulose (CMC) and styrene-butadiene rubber (SBR) is 95:2:3 mixed powder 1g, put into deionized water and acetone (3:1, v : v) Mix 10ml of solution, ball mill the obtained ceramic slurry overnight, ultrasonically disperse the mixed slurry for 20min, and apply diaphragm coating to the obtained slurry. The ceramic diaphragm is made of ordinary polyethylene (PE) diaphragm as the diaphragm base material. The resulting slurry is uniformly coated on one or both sides of a common polyethylene (PE) separator. Preheat at 60°C with an electric heating plate, wait for most of the solvent to volatilize, and dry in a vacuum oven at 60°C overnight to completely remove the solvent and obtain a modified ceramic diaphragm.

[0054] figure 1 The scanning electron microscope photograph of the composite diaphragm with alumina as the inorganic powder is obtained. It can be clearly observed from the photograph ...

Embodiment 2

[0056] Mix 1 g of the synthesized silica nanoparticles and polyacrylate terpolymer latex (LA132) in a mass ratio of 90:4:6, and put a mixed solvent of deionized water and ethanol solvent (3:1, v:v) 15ml, the obtained ceramic slurry was ball-milled overnight, and the mixed slurry was ultrasonically dispersed for 30 minutes, and the obtained slurry was subjected to diaphragm coating. The ceramic diaphragm is made of ordinary polypropylene (PP) diaphragm as the diaphragm base material. The resulting slurry is uniformly coated on one or both sides of a common polyethylene (PP) separator. Preheat at 60°C with an electric heating plate, wait for most of the solvent to volatilize, and dry in a vacuum oven at 60°C overnight to completely remove the solvent and obtain a modified ceramic diaphragm.

[0057] figure 2 The scanning electron microscope photographs of the obtained composite diaphragm with silicon oxide as inorganic powder, it can be clearly observed from the photograph th...

Embodiment 3

[0060] Mix 1 g of the synthesized magnesium oxide nanoparticles and polyacrylate terpolymer latex (LA133) in a mass ratio of 85:6:9, put in deionized water and acetone (3:1, v:v ) with 20 ml of mixed solvent, ball-mill the obtained ceramic slurry overnight, ultrasonically disperse the mixed slurry for 40 min, and apply the obtained slurry to diaphragm coating. The ceramic diaphragm is made of polyvinylidene fluoride (PVDF) diaphragm as the diaphragm substrate. The resulting slurry is evenly coated on one or both sides of a polyvinylidene fluoride (PVDF) diaphragm. Preheat at 60°C with an electric heating plate, wait for most of the solvent to volatilize, and dry in a vacuum oven at 60°C overnight to completely remove the solvent and obtain a modified ceramic diaphragm.

[0061] The heat shrinkage figure before and after heat shrinkage of the composite diaphragm of embodiment 3 is shown in Figure 4 and 5 .

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Abstract

The invention provides a composite diaphragm as well as a preparation method and application thereof, and relates to a lithium ion battery. The composite diaphragm comprises a base diaphragm material; a protective layer coats the surface of the base diaphragm material and adopts a water-soluble bonding agent; a solvent used by slurry of the protective layer is water. The preparation method of the composite diaphragm comprises the steps of (1) evenly mixing inorganic particle powder, the water-soluble bonding agent and the solvent to obtain mixed powder; and (2) coating the single or double surfaces of a common commercially available diaphragm with the mixed powder obtained in the step (1) by a film applicator, carrying out vacuum drying, and removing the solvent to obtain the composite diaphragm, wherein the thickness of the composite diaphragm can be adjusted by controlling the concentration of the slurry and the parameters of the film applicator. The composite diaphragm can be applied to the preparation of a secondary battery and can be used for replacing an existing ceramic diaphragm, wherein the secondary battery comprises but not limited to a lithium ion battery.

Description

technical field [0001] The invention relates to a lithium ion battery, in particular to a composite separator and its preparation method and application. Background technique [0002] At present, chemical power systems using liquid electrolytes, such as lithium-ion batteries, need to use diaphragm materials to block the positive and negative electrodes to avoid short circuits. The diaphragm material is mainly composed of polyethylene (Polyethylene, PE), polypropylene (Polypropylene, PP), polytetrafluoroethylene (Polytetrafluoroethylene, PTFE) and other polymer films or non-woven fabrics containing microporous structures. Liquid electrolyte (generally a carbonate organic solvent containing electrolyte salt) exists in the microporous structure to realize the conduction of ions between the positive and negative electrodes. The separator and liquid electrolyte constitute the electrolyte system. [0003] With the development of fields such as electric vehicles, higher requireme...

Claims

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Application Information

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IPC IPC(8): H01M2/16H01M50/403H01M50/451
CPCH01M10/0525H01M50/446H01M50/403Y02E60/10
Inventor 赵金保张鹏石川
Owner XIAMEN UNIV
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