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Functional ceramic coating diaphragm for lithium ion battery and preparation method for functional ceramic coating diaphragm

A technology of lithium-ion batteries and functional ceramics, which is applied in the direction of secondary batteries, battery pack components, circuits, etc., can solve problems such as battery diaphragm rupture and affect battery safety performance, to prevent rupture, prevent local temperature from continuing to rise, Guaranteed safety effect

Active Publication Date: 2018-10-30
JIANGSU QINGTAO ENERGY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As the temperature continues to rise, after reaching the rupture temperature of the diaphragm, the battery diaphragm ruptures, the positive and negative electrodes of the battery are in direct contact, and a short circuit occurs, which seriously affects the safety performance of the battery.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] A functional ceramic coating diaphragm for a lithium-ion battery, the diaphragm is composed of a polyethylene-based film and a functional ceramic coating coated on the polyethylene-based film, the functional ceramic coating includes nano barium sulfate particles, modified Non-toxic polystyrene nanoparticles, dioctyl phthalate plasticizer, titanate catalyst, sodium carboxymethylcellulose and polyacrylate binder, of which 30g of nano barium sulfate particles accounted for 33%, Modified polystyrene nanoparticles 5g, accounting for 5.5%, dioctyl phthalate plasticizer 0.1g, accounting for 0.1%, titanate catalyst 0.05g, accounting for 0.05%, carboxymethyl Sodium cellulose 1g, accounting for 1% and polyacrylate binder 3g, accounting for 3.3%.

[0025] The total thickness of the polyethylene base film and the functional ceramic coating coated on the polyethylene base film is 15 μm, and the thickness of the polyethylene base film is 12 μm.

[0026] A preparation method of a fun...

Embodiment 2

[0032] A functional ceramic coating diaphragm for a lithium-ion battery, the diaphragm is composed of a polyethylene-based film and a functional ceramic coating coated on the polyethylene-based film, the functional ceramic coating includes nano-aluminum oxide particles , modified polycarbonate nanoparticles, diisobutyl phthalate plasticizer, titanate catalyst, sodium carboxymethylcellulose and polyacrylate binder, wherein 20g of nano-alumina particles accounted for Ratio is 23%, modified polycarbonate nanoparticles 6g, accounting for 7%, dioctyl phthalate plasticizer 0.1g, accounting for 0.11%, titanate catalyst 0.03g, accounting for 0.035 %, sodium carboxymethyl cellulose 0.6g, accounting for 0.7% and polyacrylate binder 4g, accounting for 4.7%.

[0033] The total thickness of the polyethylene-based film and the functional ceramic coating coated on the polyethylene-based film is 12 μm, and the thickness of the polyethylene-based film is 9 μm.

[0034] A preparation method of...

Embodiment 3

[0040]A functional ceramic coating diaphragm for a lithium ion battery, the diaphragm is composed of a polyethylene base film and a functional ceramic coating coated on the polyethylene base film, the functional ceramic coating includes nano silicon dioxide particles, Modified polyphenylene ether nanoparticles, diisobutyl phthalate plasticizer, organotin catalyst, polyethylene glycol and polyacrylate binder, wherein nano-silica particles 18g, accounting for 23%, modified 5g of non-toxic polyphenylene ether nanoparticles, accounting for 6.4%, 0.1g of diisobutyl phthalate plasticizer, accounting for 0.13%, 0.03g of organotin catalyst, accounting for 0.038%, polyethylene glycol 0.8g, accounting for 1% and polyacrylate binder 4g, accounting for 5.1%.

[0041] The total thickness of the polyethylene film and the functional ceramic coating coated on the polyethylene film is 16 μm, and the thickness of the polyethylene film is 12 μm.

[0042] A preparation method of a functional cer...

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Abstract

The invention discloses a functional ceramic coating diaphragm for a lithium ion battery. The diaphragm is characterized by consisting of a porous polymer film layer and a functional ceramic coating with which the porous polymer film layer is coated, wherein the functional ceramic coating comprises ceramic nanoparticles, modified polymeric nanoparticles, a plasticizer, a catalyst, a dispersant andan adhesive. The functional ceramic coating diaphragm has the advantages that, when the battery is excessively heated and the local temperature exceeds 150 DEG C, the modified polymeric nanoparticlesin the functional ceramic coating are molten and plasticized under the action of the plasticizer, the molten modified polymeric nanoparticles rapidly react with ethylene carbonate around under the action of the catalyst to form a high-temperature-resistant solid film layer on the surface of the diaphragm, and by the solid film layer, the diaphragm can be protected and prevented from being brokenby high temperature on one hand and, on the other hand, ion transportation is blocked to prevent the local temperature of the battery from keeping increasing and ensure the safety of the battery.

Description

technical field [0001] The invention relates to the field of lithium-ion battery diaphragms, relates to a functional ceramic coating diaphragm for lithium-ion batteries, and also relates to a preparation method for a functional ceramic coating diaphragm for lithium-ion batteries. Background technique [0002] Lithium-ion batteries have the advantages of high energy density and long cycle life, and have been widely used in many fields such as digital electronic products and new energy vehicles, and are internationally recognized as a new energy carrier with great application prospects and market value. In recent years, my country is vigorously developing the lithium-ion battery industry, and the production capacity of lithium-ion batteries continues to increase, but the safety issues of lithium-ion batteries that follow have also attracted more and more attention. [0003] The composition of a lithium-ion battery includes a positive electrode, a negative electrode, a separato...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/16H01M2/14H01M10/0525
CPCH01M10/0525H01M50/403H01M50/411H01M50/446H01M50/449Y02E60/10
Inventor 李峥冯玉川陈雷席健杨帆南策文
Owner JIANGSU QINGTAO ENERGY TECH
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