Membrane and preparation method thereof

A diaphragm and film-forming resin technology, applied in the direction of electrical components, circuits, battery components, etc., can solve problems such as closure, loss of diaphragm ion conductivity, etc.

Inactive Publication Date: 2014-03-05
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although this composite method can endow the battery with more excellent safety, the loss of the ionic conductiv

Method used

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[0034] The present invention also provides a method for preparing a diaphragm, comprising the following steps:

[0035] Mix the film-forming resin, heat-resistant filler and plasticizer at a temperature higher than the melting point of the film-forming resin but lower than the melting point of the heat-resistant filler to obtain a film-making material; the heat-resistant filler includes inorganic heat-resistant One or both of permanent fibers and organic heat-resistant fibers;

[0036] Extruding the film-making material through a slit to obtain a liquid film, cooling and solidifying the liquid film through an air gap to obtain a precursor film;

[0037] The precursor film is placed in the extractant and then dried to obtain a separator.

[0038] According to the present invention, in the preparation process of the diaphragm, in order to achieve good dispersion of the heat-resistant filler in the film-forming resin and improve its stability during the use of the diaphragm, the...

Embodiment 1

[0050] Preparation of film-making material: First, irradiate polyester staple fibers with a diameter of 100nm to 1000nm and a length of 1mm to 100mm under normal pressure plasma for 30s, and then 5wt% high-density polyethylene (number average molecular weight 3.68×10 5 ), 45wt% of modified polyester staple fibers and 50wt% of liquid paraffin were added to the melting pot, melted and mixed at 150°C and stirred for 3 hours, and then left to stand for defoaming for 1 hour to obtain a uniform film-making material;

[0051] Film formation: Extrude the film-making material through a 20 μm slit to obtain a flat liquid film. The liquid film enters water at a temperature of 20°C through a 5 cm air gap to solidify, and the liquid film solidifies into a precursor film;

[0052] Extraction and pore formation: The heat-resistant porous diaphragm was obtained after the precursor film was soaked in ethanol for 24 hours and then air-dried.

[0053] The performance of the diaphragm prepared in...

Embodiment 2

[0055] Preparation of film-making materials: First, irradiate short polytetrafluoroethylene (PTFE) fibers with a diameter of 100nm to 500nm and a length of 30mm to 70mm under normal pressure plasma for 60s, and irradiate asbestos fibers with a diameter of 100nm to 1000nm and a length of 1mm to 100mm. The staple fibers are surface-treated with a silane coupling agent, and then 20wt% of polyvinylidene fluoride (PVDF) (number-average molecular weight 3.68×10 5 ), 15wt% modified asbestos short fibers, 15wt% modified polytetrafluoroethylene (PTFE) short fibers and 50wt% glycerol triacetate were added to the melting pot, melted and mixed at 180°C and stirred for 3 hours , and then stand for degassing for 1 hour to obtain a uniform film-making material;

[0056] Film formation: Extrude the film-making material through a 40 μm slit to obtain a flat liquid film, and the liquid film enters water at a temperature of 50°C through a 50 cm air gap to solidify, and the liquid film solidifies...

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Abstract

The invention relates to a membrane and a preparation method thereof. The membrane is a porous heat-resistant membrane consisting of membrane forming resin and heat-resistant filler. The membrane disclosed by the invention contains the membrane forming resin and the heat-resistant filler, so that the membrane has heat resistance performance and a heat closing mechanism. In a process of preparing the membrane, the membrane forming resin and the heat-resistant filler are mixed with a plasticizer to obtain a membrane preparation material, and the membrane preparation material is subjected to membrane forming, extraction, perforation and the like. The membrane disclosed by the invention is applied to a power lithium-ion battery, is high in mechanical strength and high puncture strength, can resist high temperature and has a tiny-area pressure tolerance characteristic.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a diaphragm and a preparation method thereof. Background technique [0002] Lithium-ion batteries have the advantages of high energy density, high output voltage, no memory effect, excellent cycle performance and environmental friendliness. The field has good application prospects. [0003] The separator is one of the important inner components of lithium-ion batteries, especially liquid lithium-ion batteries. It can effectively prevent the physical contact between the positive electrode and the negative electrode to prevent battery short circuit, and at the same time provide lithium ions to pass between the positive electrode and the negative electrode. The path ensures the normal progress of the lithium-ion battery charging and discharging process. As an important part of the battery, the performance of the separator determines the internal resistance, interface...

Claims

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Application Information

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IPC IPC(8): H01M2/16H01M50/403H01M50/414
CPCH01M50/446H01M50/403Y02E60/10
Inventor 石俊黎夏永高刘兆平
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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