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

An electrochemical and isolation membrane technology, applied in the field of electrochemistry, can solve the problems of coating thinning and affecting the performance of isolation membranes, and achieve the effects of reduced thickness, excellent air permeability and ion conductivity, and excellent mechanical properties

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

[0054] 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:

[0055] Add 60 parts by mass of sodium silicate solution (the mass fraction is 50%, the solvent is water) and 26 parts by mass of lithium chloride into a double planetary mixer, and stir at room temperature for 60 min; then add 2.4 parts by mass of polyacrylonitrile Granules were stirred at room temperature for 40 minutes; then 0.03 parts by mass of neopentyl glycol diacrylate and 13 parts by mass of deionized water were added, and mixed for 1 hour at room temperature to obtain an inorganic-organic mixed solution slurry;

[0056] The polypropylene / polyethylene / polypropylene three-layer composite porous substrate is coated on both sides by transfer coating, and the coating speed is 20m / min;

[0057] Use a three-stage oven to dry (each section is 3 meters long, and...

Embodiment 2

[0059] 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:

[0060] Add 40 parts by mass of potassium silicate solution (15% by mass, water as a solvent) and 1.2 parts by mass of methanol into a double planetary mixer, and stir at room temperature for 60 min; then add 6 parts by mass of polyethyleneimine particles , stirred at room temperature for 40 min; then added 3.3 parts by mass of pure acrylic emulsion and 9 parts by mass of deionized water, and mixed for 1 hour at room temperature to obtain an inorganic-organic mixed solution slurry;

[0061] The polypropylene / polyethylene / polypropylene three-layer composite porous substrate is coated on both sides by screen printing, and the coating speed is 7m / min;

[0062] It is dried in a three-stage oven (each section is 3 meters long, and the temperature of each section is 67...

Embodiment 3

[0064] 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:

[0065] Add 30 parts by mass of ammonium aluminum carbonate solution (mass fraction is 85%, solvent is water) and 15.3 parts by mass of polyvinyl alcohol into a double planetary mixer, and stir at room temperature for 60 min; then add 14 parts by mass of polyacrylic acid-benzene Ethylene copolymer particles were stirred at room temperature for 40 minutes; then 6.32 parts by mass of epoxy resin and 16 parts by mass of deionized water were added, and mixed for 1 hour at room temperature to obtain an inorganic-organic mixed solution slurry;

[0066] The polypropylene / polyethylene / polypropylene three-layer composite porous substrate is coated on both sides by extrusion coating, and the coating speed is 17m / min;

[0067] It is dried in a three-stage oven (each section...

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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 organic / inorganic composite porous coating with pore structures distributed thereon, wherein the organic / inorganic composite porous coating coats at least one surface of the porous substrate and includes an inorganic frame, a bonding agent and at least one organic functional particles. The pore structures are distributed among the inorganic frame, the bonding agent and the organic functional particles and are also distributed in the inorganic frame. 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 thin in the organic / inorganic composite 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 since the inorganic frame is matched with the organic functional particles in the isolation membrane.

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 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 circuit of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/18H01M2/16H01M50/403H01M50/446H01M50/449H01M50/489H01M50/491H01M50/497
CPCY02E60/10
Inventor 陈永乐赵俊华张盛武程文强
Owner CONTEMPORARY AMPEREX TECH CO
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