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Porous lithium ion battery separator based on crosslinked and linear polymer and preparation method and application thereof

A technology for lithium-ion batteries and polymer membranes, applied in secondary batteries, battery pack components, circuits, etc., can solve the problems of weakening the mechanical properties of the separator, excessive pore size, and uneven pore size distribution, so as to ensure the ionic conductivity , increased absorption, good application potential effect

Active Publication Date: 2019-01-01
SUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the most important manufacturing method of non-woven separator is electrospinning method, which effectively solves the two biggest problems of non-woven separator: excessive pore size and uneven pore size distribution.
However, the addition of porogens will largely weaken the mechanical properties of the separator

Method used

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  • Porous lithium ion battery separator based on crosslinked and linear polymer and preparation method and application thereof
  • Porous lithium ion battery separator based on crosslinked and linear polymer and preparation method and application thereof
  • Porous lithium ion battery separator based on crosslinked and linear polymer and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] Example 1: Preparation of porous lithium-ion battery separator based on cross-linked and linear polymers using nano-ZnO with different particle sizes as porogens

[0051] Weighed 2.0 g PVDF-HFP, 0.15 g OV-POSS, and 0.36 g nano-ZnO, put them into a mixed solvent of 10 g DMF and 5 g THF, and stirred at room temperature for 12 h to form a uniform solution. Add 0.7 g PEGMEMA and 0.35 g MMA and continue stirring for 2 h. Finally, 0.149 g DMPA was added and stirred for 20 min until it was completely dissolved; after standing for defoaming, the solution was evenly coated on a clean and flat polyethylene plate with an adjustable film applicator; finally, the polyethylene plate coated with the solution was placed on the The polymerization was initiated under ultraviolet light, and then dried in a vacuum oven at 70 °C for 12 h to remove the solvent. The diaphragm was taken out and soaked in PC for 12 h, then soaked in dilute hydrochloric acid for 2 h, then ultrasonically cleaned...

Embodiment 2

[0052] Example 2: Preparation of porous lithium-ion battery separator based on cross-linked and linear polymers with different additions of nano-ZnO as porogen

[0053] Weigh 2.0 g PVDF-HFP and 0.15 g OV-POSS, according to the theoretical mass of nano-ZnO in PVDF-HFP, add a certain mass of nano-ZnO with a particle size of 30 nm, and put it into a mixed solvent of 10 g DMF and 5 g THF, Stirred at room temperature for 12 h to form a homogeneous solution. Add 0.7 g PEGMEMA and 0.35 g MMA and continue stirring for 2 h. Finally, 0.149 g DMPA was added and stirred for 20 min until it was completely dissolved; after standing for defoaming, the solution was evenly coated on a clean and flat polyethylene plate with an adjustable film applicator; finally, the polyethylene plate coated with the solution was placed on the The polymerization was initiated under ultraviolet light, and then dried in a vacuum oven at 70 °C for 12 h to remove the solvent. The separator was taken out and soak...

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Abstract

The invention discloses a porous lithium ion battery separator based on a crosslinked and linear polymer and a preparation method and application thereof. The specific preparation method comprises thefollow steps: polyvinylidene fluoride-hexafluoropropylene, (meth)acrylate monomer, octavinyl polyhedral oligomeric silsesquioxane crosslinking agent and nano-zinc oxide are uniformly mixed in a suitable solvent, and a gel polymer film with a crosslinkied structure is formed by free radical polymerization, and after a pore forming effect of nano-zinc oxide, the ionic conductivity of the gel polymer film is 1.4 * 10<-3> S / cm, the tensile strength is up to 16 MPa, and excellent dimensional stability is achieved. The lithium ion battery separator obtained by the invention can greatly improve theionic conductivity and the high rate charging and discharging performance, and has good application potential.

Description

technical field [0001] The invention belongs to the technical field of battery separator materials, in particular to a preparation method and application of a porous lithium-ion battery separator based on cross-linked and linear polymers. Background technique [0002] Lithium-ion battery is a lithium-ion (Li + ) is a rechargeable and dischargeable battery that works by intercalating and deintercalating in positive and negative electrode materials. It is generally composed of five parts: positive electrode, negative electrode, separator, electrolyte and battery casing. Compared with traditional batteries, lithium-ion batteries have a relatively With the advantages of high energy, high battery voltage, wide operating temperature range, and no memory effect, it is widely used in mobile phones, laptop computers, and electric vehicles. As one of the most critical internal components in lithium-ion batteries, the separator has two functions: carrying electrolyte, transporting ele...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/14H01M2/16H01M10/0525H01M50/40H01M50/403H01M50/411H01M50/417H01M50/497
CPCH01M10/0525H01M50/403H01M50/411Y02E60/10
Inventor 张明祖顾陆铭何金林倪沛红
Owner SUZHOU UNIV
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