A kind of ceramic composite lithium-ion battery diaphragm and preparation method thereof

A lithium-ion battery and ceramic composite technology, which is applied to battery components, circuits, electrical components, etc., can solve the problems of poor thermal stability of the diaphragm, poor bonding performance between ceramic powder and base material, etc., and achieve high peeling Strength, high strength, uniform and stable dispersion effect

Active Publication Date: 2021-09-03
SHANGHAI ENERGY NEW MATERIALS TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0005] In view of the above-mentioned shortcomings of the prior art, the object of the present invention is to provide a ceramic composite lithium-ion battery separator and a preparation method thereof, which are used to solve the problem of poor thermal stability of the ceramic composite lithium-ion battery separator in the prior art, ceramic powder Problems such as poor bonding performance with the base material

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  • A kind of ceramic composite lithium-ion battery diaphragm and preparation method thereof

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preparation example Construction

[0030] Please refer to the attached figure 1 , the present invention provides a kind of preparation method of ceramic composite lithium-ion battery separator, and described preparation method comprises the following steps at least:

[0031] First perform step S1, mix the ceramic powder and the dispersant, add it to the solvent, and perform ball milling, then add a certain mass of polymer, photocurable resin, and photoinitiator, and stir mechanically to obtain an electrospinning solution.

[0032] As an example, in the obtained electrospinning solution, the weight percentage is as follows: the polymer is 10wt%-30wt% of the electrospinning solution, and the solvent is 70wt% of the electrospinning solution -90wt%, the ceramic powder is 5wt%-50wt% of the polymer, the dispersant is 0.1wt%-0.5wt% of the ceramic powder, the photocurable resin is the polymer 2wt%-5wt% of said photoinitiator is 5wt%-20wt% of said photocurable resin.

[0033]Preferably, the polymer is 20wt%-30wt% of t...

Embodiment 1

[0054] This embodiment provides a preparation method of a ceramic composite lithium-ion battery separator, the preparation steps comprising:

[0055] 1) Preparation of electrospinning solution: the particle size is between 20nm-5μm Al 2 o 3 After mixing with the dispersant polypyrrolidone, it was added to the dissolved dimethylacetamide for ball milling for 3 hours. The electrospinning solution was prepared by adding polyarylsulfone, epoxy acrylate, and 2-hydroxy-2-methyl-1-phenylacetone into the above solution and mechanically stirring at 50° C. for 6 hours. The electrospinning solution is composed of: polyarylsulfone 10wt%, dimethylacetamide 90wt%; Al 2 o 3 It is 10wt% of polyarylsulfone, the dispersant polypyrrolidone is Al 2 o 3 0.1wt% of epoxy acrylate, 2wt% of polyarylsulfone; 2-hydroxy-2-methyl-1-phenylacetone is 5wt% of epoxy acrylate.

[0056] 2) Preparation of nano-ceramic fiber layer: The prepared solution is subjected to an electrospinning process, and a nano...

Embodiment 2

[0060] This embodiment provides a preparation method of a ceramic composite lithium-ion battery separator, the preparation steps comprising:

[0061] 1) Preparation of electrospinning solution: the particle size is between 20nm-5μmZrO 2 After mixing with the dispersant polyacrylate, it was added to the dissolved dimethylformamide for ball milling for 4 hours. The electrospinning solution was prepared by adding polyimide, polyurethane acrylate, and 1-hydroxycyclohexyl phenyl ketone into the above solution and mechanically stirring at 60° C. for 8 hours. The composition of electrospinning solution is: polyimide 12wt%, dimethylformamide 88wt%; ZrO 2 15wt% of polyimide, dispersant polypyrrolidone is ZrO 2 0.2wt% of urethane acrylate is 3wt% of polyarylsulfone; 2-hydroxy-2-methyl-1-phenylacetone is 10wt% of epoxy acrylate.

[0062] 2) Preparation of nano-ceramic fiber layer: The prepared solution is subjected to an electrospinning process, and a nano-ceramic fiber layer is depos...

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Abstract

The invention provides a preparation method of a ceramic composite lithium-ion battery separator, the preparation method at least includes: 1) mixing ceramic powder with a dispersant, adding it to a solvent, performing ball milling, and then adding a certain mass of polymer, light Curing the resin and the photoinitiator, and mechanically stirring to obtain an electrospinning solution; 2) providing a matrix film, and using the electrospinning solution to perform an electrospinning process to deposit nano ceramic fiber layers on both sides of the matrix film , to obtain a composite film after drying treatment; 3) using ultraviolet light to cure the composite film, and obtaining a ceramic composite lithium-ion battery diaphragm after drying treatment. The ceramic composite diaphragm prepared by the method of the present invention has the advantages of high electrolyte retention rate, high strength, high membrane rupture temperature, uniform pore size distribution, and difficult peeling of the matrix membrane and nano-ceramic fiber layer, which is conducive to improving the cycle stability of lithium-ion batteries. And high rate charge and discharge performance, suitable for power lithium-ion batteries.

Description

technical field [0001] The invention relates to the field of lithium-ion battery separators, in particular to a ceramic composite lithium-ion battery separator and a preparation method thereof. Background technique [0002] As a key component in lithium-ion batteries, the diaphragm mainly serves to isolate the positive and negative electrodes and prevent large-area short circuits. At the same time, the electrolyte is retained to provide a channel for the conduction of lithium ions in the separator. The quality of its performance directly affects the interface performance and internal resistance of the battery, which in turn affects the rate charge and discharge performance and cycle performance of the battery. [0003] The current commercial lithium-ion battery separators are mainly polyolefin microporous separators, and the preparation methods are mainly divided into dry method and wet method. US patents US 4138459 and 3801404 disclose methods for preparing polyolefin mic...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M50/244H01M50/403H01M50/44H01M50/434H01M50/446H01M50/454B82Y30/00B82Y40/00H01M50/443H01M50/489
CPCB82Y30/00B82Y40/00H01M50/446H01M50/403Y02E60/10
Inventor 程跃彭锟
Owner SHANGHAI ENERGY NEW MATERIALS TECH CO LTD
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