Manufacture method and applications of high temperature resistant and deformation resistant composite microporous membrane

A technology of microporous membranes and polymers, which is applied in the direction of electrical components, circuits, battery pack components, etc., and can solve problems such as diaphragm corrosion, poor environmental friendliness, and pore structure damage

Inactive Publication Date: 2016-06-29
SHANGHAI ENERGY NEW MATERIALS TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this method has the advantage of relatively simple processing technology, because the solvent used is an organic solvent with strong solubility, it is easy to have a certain corrosion effect on the diaphragm, resulting in a decrease in the mechanical strength of the diaphragm and damage to the pore structure.
In addition, because the solvent used has a great destructive effect on the environment, the environmental friendliness is poor and it is a material controlled by the state. Therefore, it is necessary to find a water-based system that can replace the organic system.
[0010] The prior art also proposes the use of general binary component water-based sl

Method used

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  • Manufacture method and applications of high temperature resistant and deformation resistant composite microporous membrane
  • Manufacture method and applications of high temperature resistant and deformation resistant composite microporous membrane
  • Manufacture method and applications of high temperature resistant and deformation resistant composite microporous membrane

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Effect test

preparation example Construction

[0021] The preparation method of the high temperature resistant and deformation resistant composite microporous film of the present invention comprises the following steps:

[0022] (a) providing a polymeric microporous membrane;

[0023] The polymer microporous membrane (also known as polymer microporous membrane) of the present invention is a material that is difficult to absorb and swell due to the limitation of the electrolyte, and is selected from at least one of the following polymers: ultra-high molecular weight polyethylene, linear Polyethylene, branched polyethylene, high density polyethylene, low density polyethylene, polypropylene, polyvinyl alcohol, polyvinyl acetate, polytetrafluoroethylene, polyvinylidene fluoride, polyethylene terephthalate, Polyurethane, polyimide, polyacrylonitrile, polymethyl methacrylate, polybutyl acrylate, polystyrene and its copolymers, polyvinyl chloride, polyimide, polyaramid, nylon, polysulfone, poly Carbonate, polyacrylamide, polymet...

Embodiment

[0087] Below in conjunction with embodiment, the present invention is further described.

[0088] experiment method

[0089] 1. Thickness

[0090] Measured with a Marr Film Thickness Gauge

[0091] 2. Air permeability

[0092] Measured with Gurley Air Permeability Tester 4110

[0093] 3. Pore content

[0094] Determination by Quanta Poremaster-33 automatic mercury porosimeter

[0095] 4. Heat shrink

[0096] At room temperature and constant temperature, the original length L0 of the sample along the direction of machine travel was measured, and it was perpendicular to the direction of travel of the machine T0. The sample was heated in a constant temperature and humidity controllable oven at 105 °C for 1 h and then cooled to the original test conditions. Measure the length L1 along the machine travel direction and the length T1 perpendicular to the machine travel direction of the sample at this time, and the calculation formula is as follows:

[0097] MD%=(L1-L0) / L0×10...

Embodiment 1

[0108] 1. Preparation of Polymer Porous Membranes

[0109] To the molecular weight of 2 × 10 -6 Add to g / mol polyethylene, based on the weight of the polyethylene, 0.3% antioxidant 2,6-tert-butyl-4-methylphenol and phosphite (the weight ratio of the two is 1:1), after mixing It is added to the screw extruder, and the side material port of the extruder supplies natural mineral oil as a solvent, and the added amount of the solvent accounts for 65% of the total weight of polyethylene.

[0110] Kneading at 210°C, stirring and shearing in the screw conveying section at a speed of 75 rpm to form polyethylene gel, extruding a stretched film of 745 μm from the T-die at the top of the extruder, and biaxially stretching stretched (longitudinal stretch ratio of 5, transverse stretch ratio of 7.8), after degreasing, heat-setting at 125 ° C to obtain 12 μm ultra-high molecular weight polyethylene microporous membrane.

[0111] 2. Preparation of Ceramic Slurry

[0112] Weigh main binder,...

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Abstract

The invention discloses a manufacture method and applications of a high temperature resistant and deformation resistant composite microporous membrane. The manufacture method comprises the following steps: (a) providing a polymer microporous membrane; (b) dispersing ceramic nano particles into an aqueous adhesive to form aqueous slurry; (c) painting the aqueous slurry on the surface of the polymer microporous membrane to form a composite microporous membrane; wherein the aqueous adhesive comprises a main adhesive and an interlayer adhesive, the main adhesive is prepared from cellulose ether, natural polymer and derivatives thereof, or a mixture of cellulose ether and natural polymer and derivatives thereof; the interlayer adhesive is prepared from polyacrylamide, poly(vinyl amide), polyvinylpyrrolidone, polymethyl methacrylate, polycarboxylic acid, modified paraffin resin, carbomer, polyacrylic acid, urethane acrylate, polyacrylate copolymer emulsion, cis-polybutadiene, butadiene styrene rubber, polyurethane, carbamate, and liquid glue made of part of acrylic epoxy resin, isobornyl acrylate, starch, modified polyurea, and low molecular polyvinyl wax, and the weight ratio of the main adhesive to the interlayer adhesive is 20:55-65:5.

Description

technical field [0001] The present invention relates to an aqueous ceramic slurry, which can be advantageously used to prepare a high-temperature-resistant and deformation-resistant composite microporous membrane suitable for a lithium ion battery separator. The lithium ion battery separator prepared with the aqueous ceramic slurry of the present invention has stable dimensions, smooth appearance and high temperature deformation resistance, thereby improving the durability and stability of the lithium ion battery using the membrane as the separator. Background technique [0002] With the increasing consumption of non-renewable resources, especially the consumption of petroleum resources, energy security has become a problem that must be solved in our country. People have to consider developing new energy to replace traditional energy. The development and utilization of new energy and renewable energy are also building resources. An important tool for an economical and enviro...

Claims

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Application Information

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IPC IPC(8): C08J9/36C08L23/06H01M2/16H01M50/403H01M50/446H01M50/489H01M50/491
CPCY02E60/10
Inventor 程跃王伟强徐建峰苏晓明顾杨建
Owner SHANGHAI ENERGY NEW MATERIALS TECH CO LTD
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