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Electrochemical apparatus, isolation membrane used therein and preparation method of the isolation membrane

An electrochemical and isolation film technology, applied in the field of electrochemistry, can solve the problems of thinning of the coating and affect the performance of the isolation film, so as to achieve increased coating thickness, excellent air permeability and ion conductivity, and reduce the risk of uneven thickness Effect

Active Publication Date: 2015-10-14
CONTEMPORARY AMPEREX TECH CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this isolation film can use water as a solvent and only needs to be coated once, it needs to carefully select the range of water contact angle of the polymer or monomer used, and it cannot make the coating thinner, otherwise it will be seriously damaged. Affect the performance of the prepared isolation film

Method used

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  • Electrochemical apparatus, isolation membrane used therein and preparation method of the isolation membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] The process of positive electrode sheet, negative electrode sheet, non-aqueous electrolyte, and cell forming is the same as that of Comparative Example 1, but the separator is prepared by the following method:

[0052] Add 40 parts by mass of sodium silicate solution (the mass fraction is 50%, the solvent is water) and 17 parts by mass of lithium chloride into a double planetary mixer, and stir at room temperature for 60 minutes; then add 0.016 parts by mass of pure acrylic acid The emulsion and 10 parts by mass of deionized water were mixed at room temperature for 1 hour to obtain an inorganic salt solution slurry;

[0053] The polypropylene porous substrate is coated on both sides by transfer coating, and the coating speed is 40m / min;

[0054] It is dried in a three-stage oven (each section is 3 meters long, and the temperature of each section is 40°C, 42°C, and 40°C respectively). After drying, the thickness of one side of the obtained coating is measured to be 0.1 μ...

Embodiment 2

[0056] The process of positive electrode sheet, negative electrode sheet, non-aqueous electrolyte, and cell forming is the same as that of Comparative Example 1, but the separator is prepared by the following method:

[0057] Add 24 parts by mass of potassium silicate solution (20% by mass, water as the solvent) and 0.72 parts by mass of methanol into a double planetary mixer, and stir at room temperature for 60 minutes; then add 1.25 parts by mass of neopentyl glycol Diacrylate and 13 parts by mass of deionized water were mixed at room temperature for 1 hour to obtain an inorganic salt solution slurry;

[0058] The polypropylene / polyethylene / polypropylene three-layer composite porous substrate is coated on both sides by screen printing, and the coating speed is 2m / min;

[0059] It is dried in a three-stage oven (each section is 3 meters long, and the temperature of each section is 90°C, 100°C, and 90°C respectively). After drying, the thickness of the coating on one side is m...

Embodiment 3

[0061] The process of positive electrode sheet, negative electrode sheet, non-aqueous electrolyte, and cell forming is the same as that of Comparative Example 1, but the separator is prepared by the following method:

[0062] Add 30 parts by mass of ammonium aluminum carbonate solution (mass fraction is 80%, solvent is water) and 15 parts by mass of polyvinyl alcohol into a double planetary mixer, stir at room temperature for 60min; then add 2.9 parts by mass of epoxy Resin and 9 parts by mass of deionized water were mixed at room temperature for 1 hour to obtain an inorganic salt solution slurry;

[0063] The polypropylene / polyethylene / polypropylene three-layer composite porous substrate is coated on both sides by extrusion coating, and the coating speed is 15m / min;

[0064] It was dried in a three-stage oven (the length of each section is 3 meters, and the temperature of each section is 62°C, 70°C, and 64°C). After drying, the thickness of one side of the coating was measure...

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Abstract

The invention discloses an electrochemical apparatus, an isolation membrane used therein and a preparation method of the isolation membrane. The isolation membrane includes a porous substrate and an inorganic frame porous coating which coats at least one surface of the porous substrate and includes an inorganic frame, a bonding agent and pore structures. The pore structures are distributed in the inorganic frame and between the inorganic frame and the bonding agent. The preparation method is used for preparing the isolation membrane. Compared with an isolation membrane in the prior art, the isolation membrane of the electrochemical apparatus is low and uniform in thickness of the inorganic frame porous coating, and in addition, the isolation membrane is better than the isolation membrane in the prior art in breathability, ion conductivity, mechanical performance, thermal stability and oxidizing resistance.

Description

technical field [0001] The invention belongs to the technical field of electrochemistry, and more specifically, the invention relates to a separator film of an electrochemical device with good performance and a preparation method thereof. Background technique [0002] Traditional electrochemical devices (such as lithium-ion secondary batteries) mostly use polyolefin porous substrates as separators, but this separator will shrink greatly when heated, so it is easy to cause a short circuit between the positive and negative electrodes and cause safety accidents. In order to solve this problem, people in the industry try to use binders to coat inorganic particles on porous substrates to produce organic / inorganic composite porous separators containing inorganic material coatings, hoping to reduce the thermal stability of separators through the thermal stability of inorganic particles. Thermal shrinkage, so as to achieve the purpose of preventing the positive and negative short ci...

Claims

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Application Information

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IPC IPC(8): H01M2/16H01M50/431H01M50/449
CPCY02E60/10
Inventor 陈永乐张盛武赵俊华
Owner CONTEMPORARY AMPEREX TECH CO
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