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Nonwoven fabric lithium ion battery composite diaphragm and preparation method thereof

A lithium-ion battery and composite diaphragm technology, applied in battery pack parts, circuits, electrical components, etc., can solve the problems of powder loss, surface modification damage to the mechanical strength of the matrix material, etc., to improve the liquid absorption rate and liquid retention rate. , The effect of avoiding excessive growth of lithium dendrites, large liquid absorption rate and liquid retention rate

Inactive Publication Date: 2015-08-12
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this method can partially enhance the bonding between the base material and the ceramic powder, the surface modification greatly damages the mechanical strength of the base material, and the phenomenon of "powder dropping" still exists during packaging and long-term circulation.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] A kind of preparation method of nonwoven lithium ion battery composite membrane of the present invention, preparation step comprises:

[0030] (1) Ceramic powder pretreatment: SiO with a particle size between 20nm and 5μm 2 Mix and stir with the photoinitiator 2‐hydroxy‐2‐methyl‐1‐phenylacetone at room temperature, using SiO 2 The pore structure of 2‐hydroxy‐2‐methyl‐1‐phenylacetone and SiO 2 In situ loading of 2‐hydroxy‐2‐methyl‐1‐phenylacetone as SiO 2 5wt% of;

[0031] (2) Ceramic layer preparation: the pretreated SiO 2 , binder polyvinyl alcohol, dispersant polypyrrolidone and solvent water, configured as a roller coating solution, wherein, SiO 2 Accounting for 3wt% of the roller coating solution, the binder polyvinyl alcohol is SiO 2 10wt% of the dispersant polypyrrolidone is SiO 2 0.1wt%, and the balance of water; after double-sided roll-coating polyethylene non-woven fabric at room temperature, the polyethylene non-woven fabric has a thickness of 20 μm, a p...

Embodiment 2

[0037] A kind of preparation method of nonwoven lithium ion battery composite membrane of the present invention, preparation step comprises:

[0038] (1) Ceramic powder pretreatment: Al with a particle size between 20nm and 5μm 2 o 3 Mix and stir with the photoinitiator 1-hydroxycyclohexyl phenyl ketone at room temperature, using Al 2 o 3 The pore structure of the photoinitiator 1-hydroxycyclohexyl phenyl ketone and Al 2 o 3 In situ loading, the photoinitiator 1-hydroxycyclohexyl phenyl ketone is Al 2 o 3 10wt% of;

[0039] (2) Ceramic layer preparation: the pretreated Al 2 o 3 , binder polyacrylamide, dispersant polyethylene glycol and solvent water, configured as a roller coating solution, wherein, Al 2 o 3 Accounting for 25wt% of the roller coating solution, the binder polyacrylamide is Al 2 o 3 50wt% of the dispersant polyethylene glycol is Al 2 o 3 0.5wt%, and the balance of solvent water; after double-sided roll-coating polypropylene non-woven fabric at roo...

Embodiment 3

[0045] A kind of preparation method of nonwoven lithium ion battery composite membrane of the present invention, preparation step comprises:

[0046] (1) Ceramic powder pretreatment: TiO with a particle size between 20nm and 5μm 2 Mix and stir with the photoinitiator 2,4,6-trimethylbenzoyl-diphenylphosphine oxide at room temperature, and use TiO 2 The pore structure of the photoinitiator 2,4,6‐trimethylbenzoyl‐diphenylphosphine oxide and TiO 2 In situ loading of the photoinitiator 2,4,6‐trimethylbenzoyl‐diphenylphosphine oxide as TiO 2 8wt% of;

[0047] (2) Ceramic layer preparation: the pretreated TiO 2 , binder sodium carboxymethyl cellulose, dispersant polyacrylamide and solvent water, configured as a roller coating solution, wherein, TiO 2 Accounting for 10wt% of the roller coating solution, the binder sodium carboxymethylcellulose is TiO 2 20wt% of the dispersant polyacrylamide is TiO 2 0.2wt%, and the balance of solvent water, after double-sided roll coating of pol...

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Abstract

The invention relates to a nonwoven fabric lithium ion battery composite diaphragm and a preparation method thereof, the nonwoven fabric lithium ion battery composite diaphragm is provided with a three layer structure successively comprising a nonwoven fabric substrate layer, a nano ceramic layer and an electrostatic spinning nanofiber layer, or is provided with a five layer structure successively comprising a nonwoven fabric substrate layer, nano ceramic layers and electrostatic spinning nanofiber layers, wherein the nano ceramic layers and the electrostatic spinning nanofiber layers are arranged on both sides of the nonwoven fabric substrate layer; the nano ceramic layer and the nonwoven fabric substrate layer are bonded by pre polymer polymerization of nano ceramic layer ceramic powder as a polymerization site and a nonwoven fabric substrate layer contact site under uv irradiation, and the nano ceramic layer and the electrostatic spinning nanofiber layer are bonded by pre polymer polymerization of the nano ceramic layer ceramic powder as the polymerization site and a nano fiber layer contact site under uv irradiation. The nonwoven fabric lithium ion battery composite diaphragm has the advantages of high mechanical strength, high electrolyte retention rate high puncture strength, high diaphragm rupture temperature, uniform pore size distribution and the like, is an ideal power lithium ion battery composite diaphragm.

Description

technical field [0001] The invention relates to the field of lithium-ion battery diaphragms, in particular to a non-woven lithium-ion battery composite diaphragm and a preparation method thereof. Background technique [0002] Lithium-ion batteries have outstanding advantages such as high specific capacity, long cycle life, no memory effect, and environmental protection, so they have received great attention in the fields of portable electronic devices, power batteries, and energy storage batteries. Lithium-ion batteries are mainly composed of four major components: positive electrode material, negative electrode material, electrolyte, and separator. Among them, the separator mainly plays the role of isolating the positive and negative electrodes, preventing internal short circuit, and at the same time retaining a large amount of liquid electrolyte to complete the rapid conduction of lithium ions between the positive and negative electrodes. The performance of the diaphragm ...

Claims

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Application Information

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IPC IPC(8): H01M2/16H01M2/14H01M50/403H01M50/434H01M50/44H01M50/443H01M50/454H01M50/457H01M50/491
CPCY02E60/10
Inventor 彭锟王彪王华平季诚昌
Owner DONGHUA UNIV
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