Reticular porous composite isolation film and preparation method thereof

A reticular porous, isolating membrane technology, applied in the direction of separator/film/diaphragm/spacer element, electrical element, electrochemical generator, etc., can solve the problem of low closed cell temperature and membrane breaking temperature, poor ion exchange capacity, The problem of poor extrusion resistance and safety, to achieve the effect of increased film breaking temperature, strong wetting ability, and improved safety

Inactive Publication Date: 2017-02-01
SINOMA SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] At present, most of the separators used in lithium secondary batteries are polyolefin microporous film materials, which have large heat shrinkage, poor ion exchange capacity, poor lyophilicity, poor cycle performance, poor puncture resistance safety, poor overcharge resistance safety, and Poor temperature safety, poor extrusion resistance safety, low closed cell temperature and membrane rupture temperature; although there are related reports on composite membranes, the existing composite membranes have the advantages of electrolyte absorption capacity, safety, coating dispersion, and circulation. Performance and service life, etc., need to be further improved

Method used

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  • Reticular porous composite isolation film and preparation method thereof
  • Reticular porous composite isolation film and preparation method thereof
  • Reticular porous composite isolation film and preparation method thereof

Examples

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Embodiment 1

[0030] A method for preparing a mesh porous composite isolation membrane, comprising the steps of:

[0031] 1) Mix and grind insulating material particles magnesium oxide and deionized water until the insulating material particles D50=1.2 μm, and then stir for 5 hours at a temperature of 50° C. and a rotational speed of 130 r / min; wherein, the insulating material particles are mixed with The mass ratio of deionized water is 1;

[0032] 2) Add SH-PS-0801 acrylic emulsion pressure-sensitive adhesive (Jiangyin Shuanghua Technology Co., Ltd.) to the material obtained in step a) and stir for 3 hours at a temperature of 30°C and a speed of 330r / min. , the mass ratio of insulating material particles to binder is 0.1;

[0033] 3) Add calcium zinc stabilizer CZ-108 (Cindy Plastics) and polyethylene oxide PEO (Germany BASF) to the material obtained in step 2) in sequence, and stir for 2 Hours, mixed to make a slurry, wherein the mass ratio of insulating material particles to calcium-z...

Embodiment 2

[0037] A method for preparing a mesh porous composite isolation membrane, comprising the steps of:

[0038] 1) Mix the titanium dioxide of the insulating material particles with deionized water and grind until the particle size of the insulating material particles reaches D50=1 μm, and then stir for 3 hours at a temperature of 70° C. and a rotational speed of 140 r / min; wherein, the insulating material particles are mixed with The mass ratio of deionized water is 0.6;

[0039] 2) Add SH-603 pressure-sensitive adhesive (Jiangyin Shuanghua Technology Co., Ltd.) to the material obtained in step a) and stir for 2 hours at a temperature of 35°C and a speed of 310r / min. The mass ratio of material particles to binder is 0.06;

[0040] 3) Add calcium zinc stabilizer CZ-108 (Cindy Plastics) and polyethylene oxide PEO (Germany BASF) to the material obtained in step 2) in sequence, and stir for 1.5 hours at a temperature of 30°C and a speed of 330r / min hours, mixed to make a slurry, wh...

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Abstract

The invention discloses a reticular porous composite isolation film and a preparation method thereof. The reticular porous composite isolation film comprises a porous film layer and a reticular porous dielectric layer compounded on the porous film layer, wherein the aperture on the reticular porous dielectric layer is 0.1-1 micron; and the porosity of the reticular porous dielectric layer is 38%-43%. The reticular porous composite isolation film disclosed by the invention has relatively high ion-exchange capacity and lyophilic property; and the infiltrating ability of an electrolyte is high, the thermal shrinkage rate is low, the film rupture temperature is high and the safety is improved. Furthermore, according to the preparation method of the reticular porous composite isolation film, the technology is simple, the demand on equipment is low, the conditions are easy to control, the cost is low and the preparation method is suitable for industrial production. The prepared lithium battery is significantly improved in the aspects of the safety, the cyclicity, the rate capability and the like.

Description

technical field [0001] The invention relates to a mesh-shaped porous composite isolation membrane and a preparation method thereof, belonging to the technical field of batteries. Background technique [0002] The separator of lithium-ion batteries is one of the key inner components of lithium-ion batteries, and the separator has a crucial impact on the performance of the battery. With the rapid development of high energy density batteries and power batteries, higher requirements are put forward for the safety of lithium-ion secondary batteries, and the separator is one of the key factors affecting the safety of lithium-ion secondary batteries. [0003] At present, most of the separators used in lithium secondary batteries are polyolefin microporous film materials, which have large heat shrinkage, poor ion exchange capacity, poor lyophilicity, poor cycle performance, poor puncture resistance safety, poor overcharge resistance safety, and Poor temperature safety, poor extrusi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/14H01M2/16H01M10/0525H01M50/403H01M50/449H01M50/489H01M50/491
CPCH01M10/0525H01M50/409H01M50/403H01M50/449Y02E60/10
Inventor 陈春高维泰马驰吴敏王丹
Owner SINOMA SCI & TECH
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