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Polyimide microsphere slurry, composite separator and lithium ion battery

A technology of polyimide microspheres and polyimide, which is applied to battery components, circuits, electrical components, etc., can solve the problems of poor air permeability and pore blockage of composite lithium battery separators, and achieve excellent mechanical properties and surface Effect of low density and improved high temperature resistance

Active Publication Date: 2019-05-28
DONGGUAN DONGYANG SOLAR SCI RES & DEV CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

CN108346765A discloses a polyimide-coated composite lithium battery diaphragm, but because it is coated with a solution of polyimide in its preparation process, it is easy to cause the pores of the polyolefin diaphragm substrate to be blocked, therefore, the composite lithium battery is obtained Poor air permeability of battery separator

Method used

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  • Polyimide microsphere slurry, composite separator and lithium ion battery
  • Polyimide microsphere slurry, composite separator and lithium ion battery
  • Polyimide microsphere slurry, composite separator and lithium ion battery

Examples

Experimental program
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Effect test

Embodiment approach

[0043] According to some embodiments of the present invention, the dianhydride is 4,4'-oxydiphthalic anhydride (ODPA), pyromellitic dianhydride (PMDA), 4,4'-terephthalic dioxyphthalic anhydride Phthalic anhydride (triphenylene ether dianhydride, HQDPA), bisphenol A dianhydride (BPADA), 3,3',4,4'-biphenyltetracarboxylic dianhydride (BPDA), 3,3', 4,4'-benzophenonetetracarboxylic dianhydride (BTDA), hexafluorodianhydride (6FDA), 2,3,3',4'-biphenyltetracarboxylic dianhydride, 1,2,3,4-cyclo Pentylenetetracarboxylic dianhydride, 1,2,4,5-cyclohexanetetracarboxylic dianhydride, cyclobutanetetracarboxylic dianhydride, 3,4'-oxydiphthalic anhydride, hydrogenated biphenyltetracarboxylic dianhydride anhydride, 3,3',4,4'-diphenylsulfone tetracarboxylic dianhydride, 5-[2-(1,3-dioxoisobenzofuran-5-yl)propan-2-yl] One or more combinations of isobenzofuran-1,3-dione.

[0044]According to some embodiments of the present invention, the diamine is 4,4'-diaminodiphenyl ether (ODA), m-phenylenedia...

Embodiment 1

[0079] 30 parts of PI microspheres, 2 parts of surfactant polyoxyethylene alkylamide and 60 parts of deionized water were fully stirred and ground at 3000rpm for 2h, and then 5 parts of water-based adhesive styrene-butadiene latex and 3 parts of wetting agent twelve were added The sodium alkylbenzene sulfonate was uniformly dispersed and continued to stir at 1000rpm for 2h to obtain PI microsphere slurry.

[0080] The above slurry was coated on one side of the 12μm PE base film layer, the coating speed was 30m / min, the coating thickness was 50μm, and dried at 80°C for 10min to obtain a lithium battery separator with a coating thickness of 2μm on one side.

[0081] Then apply the above slurry on the other side of the PE base film, the coating speed is 30m / min, the coating thickness is 50μm, and it is dried at 80°C for 10min to obtain a double-sided polyimide with a coating thickness of 2μm on one side Composite lithium battery diaphragm.

Embodiment 2

[0083] According to the operation method in Example 1, PI microspheres and PI microsphere aqueous mixed slurry were prepared.

[0084] 25 parts of PI microspheres, 2 parts of surfactant polyoxyethylene alkylamide and 65 parts of deionized water were fully stirred and ground at 3000rpm for 2h, and then 5 parts of water-based adhesive styrene-butadiene latex and 3 parts of wetting agent twelve were added The sodium alkylbenzene sulfonate was uniformly dispersed and continued to stir at 1000rpm for 2h to obtain PI microsphere slurry.

[0085] The above slurry was coated on one side of the 12 μm PE base film layer, the coating speed was 30 m / min, the coating thickness was 75 μm, and dried at 90°C for 10 minutes to obtain a lithium battery separator with a coating thickness of 2.5 μm on one side.

[0086]Then apply the above slurry to the other side of the PE base film, the coating speed is 30m / min, the coating thickness is 75μm, and dried at 90°C for 10min to obtain a double-sided...

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Abstract

The invention relates to the technical field of lithium ion battery separator preparation, and discloses polyimide microsphere slurry, a composite separator and a lithium ion battery. The slurry comprises polyimide microspheres, a surfactant, a water-based adhesive, a wetting agent and deionized water. The composite separator prepared from the slurry is good in thermal stability, excellent in puncture resistance and good in air permeability, and compared with a ceramic coated separator, the surface density of a coating is lower, and relatively, the specific capacity of a lithium battery comprising the composite separator is higher.

Description

technical field [0001] The invention relates to the technical field of preparation of lithium-ion battery separators, more specifically, to a polyimide microsphere slurry, a composite separator prepared from the slurry, and a lithium-ion battery comprising the composite separator. Background technique [0002] Lithium-ion batteries have the advantages of high specific energy, long cycle life, no memory effect, safety, reliability, and fast charging and discharging, and have become a research hotspot in new power supply technologies in recent years. The composition of a lithium-ion battery includes a positive electrode, a negative electrode, a separator and an electrolyte. As a barrier between the positive and negative electrodes, the separator plays a vital role in the performance of the lithium-ion battery, and its performance directly affects the capacity and cycle of the battery, especially It is an important factor affecting the safety performance of the battery, and coa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/16H01M2/14H01M50/423H01M50/443
CPCY02E60/10
Inventor 李义涛邓永茂何鑫云晧程堂剑陈志钊林丽平
Owner DONGGUAN DONGYANG SOLAR SCI RES & DEV CO LTD
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