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Thermal shutdown heat-resistant high-safety coated and modified membrane and preparation method thereof

A technology with high temperature resistance and thermal shutdown, which is applied in the direction of separators/films/diaphragms/spacers, electrical components, electrochemical generators, etc. The rapid development of ion battery technology and other issues, to achieve the effect of expanding the thermal shutdown temperature and membrane rupture temperature range, high membrane rupture temperature, and preventing battery short circuit

Pending Publication Date: 2018-09-18
CANGZHOU MINGZHU PLASTIC +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Due to the low thermal deformation temperature of the traditional polyolefin separator, the separator will melt or deform at about 160°C, which affects the safety of the battery. The existing ceramic-coated separator is coated with alumina inorganic substances on the surface, and the membrane rupture temperature It can only be raised to 170-180°C, but it still cannot meet the rapid development needs of lithium-ion battery technology

Method used

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  • Thermal shutdown heat-resistant high-safety coated and modified membrane and preparation method thereof
  • Thermal shutdown heat-resistant high-safety coated and modified membrane and preparation method thereof
  • Thermal shutdown heat-resistant high-safety coated and modified membrane and preparation method thereof

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preparation example Construction

[0063] A method for preparing a thermal shutdown high-temperature-resistant high-safety coated modified diaphragm, comprising the following steps:

[0064] (1) After dispersing and mixing the inorganic ceramic material and deionized water, add high-temperature-resistant resin and catalytic polyaddition organic matter, and stir evenly to obtain a uniformly dispersed ceramic / resin coating slurry;

[0065] (2) After dispersing and mixing the polymer microspheres and deionized water at high speed, add a water-based binder, a water-based wetting agent and a water-based dispersant, and stir evenly to obtain a uniformly dispersed polymer microsphere slurry;

[0066] (3) coating the ceramic / resin coating slurry obtained in step (1) on one side or both sides of the base film, and after the ceramic coating is dried, a ceramic / resin diaphragm is obtained;

[0067] (4) Apply the polymer microsphere slurry obtained in step (2) to one or both sides of the ceramic / resin diaphragm obtained in...

Embodiment 1

[0072] (1) After dispersing and mixing 44wt% alumina powder (D50: 0.3μm, BET: 5.3m2 / g) and 50wt% deionized water at high speed, add 4wt% polyurethane resin and 2wt% catalytic polyaddition type Organic matter, after stirring evenly, a uniformly dispersed ceramic / resin slurry is obtained;

[0073] (2) After high-speed dispersion and mixing of 15wt% polymer microspheres and 70wt% deionized water, add 7wt% polymethyl acrylate, 4wt% sodium dodecylbenzenesulfonate and 4wt% polyacrylic acid, After uniform stirring, a uniformly dispersed polymer microsphere slurry is obtained;

[0074] (3) Coat the ceramic / resin slurry obtained in step (1) on both sides of the polypropylene microporous membrane by gravure coating, with a coating thickness of 2 μm on each side, and after the ceramic / resin coating is dried , to obtain a ceramic / resin diaphragm;

[0075] (4) The polymer microsphere slurry obtained in step (2) is coated on both sides of the ceramic / resin diaphragm obtained in step (3) b...

Embodiment 2

[0077] (1) After high-speed dispersion and mixing of 30wt% boehmite powder (D50: 2.0μm, BET: 0.5m2 / g) and 66wt% deionized water, add 3wt% epoxy resin and 1wt% catalytic polyaddition Type organic matter, after stirring evenly, a uniformly dispersed ceramic / resin slurry is obtained;

[0078] (2) After high-speed dispersion and mixing of 20wt% polymer microspheres and 60wt% deionized water, add 10wt% styrene-acrylic latex, 5wt% sodium aryl naphthalene sulfonate and 5wt% ammonium polyacrylate, and stir evenly Obtain the evenly dispersed polymer microsphere slurry;

[0079] (3) Apply the ceramic / resin slurry obtained in step (1) to one side of the polyamide electrospinning membrane by dip coating, the coating thickness is 4 μm, after the ceramic / resin coating is dried , to obtain a ceramic / resin diaphragm;

[0080] (4) The polymer microsphere slurry obtained in step (2) is coated on the same side of the ceramic / resin diaphragm coating obtained in step (3) by spray coating, and th...

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Abstract

The invention discloses a thermal shutdown heat-resistant high-safety coated and modified membrane, which comprises a base membrane, wherein a ceramic / resin coating and a polymer microsphere coating are arranged at one side or two sides of the base membrane; the ceramic / resin coating is prepared from the following components in percentages by mass: 30-60wt% of an inorganic ceramic material, 25-66wt% of deionized water, 3-10wt% of heat-resistant resin and 1-5wt% of a catalytic polyaddition organic matter; and the polymer microsphere coating is prepared from the following components in percentages by mass: 3-20wt% of polymer microspheres, 60-93wt% of deionized water, 3-10wt% of a water-based binder, 0.5-5wt% of a water-based wetting agent and 0.5-5wt% of a water soluble dispersant. The prepared thermal shutdown heat-resistant high-safety coated and modified membrane has a trigger effect of achieving thermal shutdown of the membrane at relatively low temperature, the thermal shutdown temperature of the membrane is lower than 130 DEG C, the thermal shutdown mechanism can be triggered at relatively low temperature in a thermal runaway exothermic process of a lithium-ion battery, the internal resistance of the battery is increased by two orders of magnitude after thermal shutdown, and further lithium ion exchange in the battery is prevented to reduce the generated heat.

Description

technical field [0001] The invention relates to the technical field of lithium-ion battery diaphragms, in particular to a water-based ceramic coating diaphragm for lithium-ion batteries, in particular to a heat-shutdown, high-temperature resistant, high-safety coating modified diaphragm, and a preparation method for the battery diaphragm. Background technique [0002] With the emergence of high-energy batteries, on the one hand, the capacity of lithium-ion batteries is higher, and the energy density is generally improved. On the other hand, higher requirements are placed on the safety of lithium-ion batteries, especially for the performance of lithium-ion battery separators. . [0003] Lithium-ion batteries will release more heat during the charging and discharging process or short circuit, which will cause the local heat accumulation temperature of the battery to rise. In severe cases, the battery may explode. Therefore, the lithium-ion battery separator is used to isolate ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/14H01M2/16H01M2/18H01M10/0525H01M50/403H01M50/434H01M50/446H01M50/449
CPCH01M10/0525H01M50/409H01M50/403H01M50/463Y02E60/10
Inventor 韩宏哲于中彬赵中雷李昆良邵培苓赵佳佳王帅
Owner CANGZHOU MINGZHU PLASTIC
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