Porous lithium-ion battery separator based on cross-linked and linear polymers and its preparation method and application

A lithium-ion battery and porosity technology, which is applied in the field of porous lithium-ion battery diaphragm preparation, can solve problems such as excessive pore size, weakened mechanical properties of the diaphragm, and uneven pore size distribution, and achieve increased absorption, excellent dimensional stability, and mechanical properties. good strength effect

Active Publication Date: 2021-06-18
SUZHOU UNIV
View PDF5 Cites 0 Cited by
  • 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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Porous lithium-ion battery separator based on cross-linked and linear polymers and its preparation method and application
  • Porous lithium-ion battery separator based on cross-linked and linear polymers and its preparation method and application
  • Porous lithium-ion battery separator based on cross-linked and linear polymers and its preparation method and application

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 separator 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, 0.15 g OV-POSS, according to the theoretical mass of nano-ZnO accounting for 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 12h 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 ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

PropertyMeasurementUnit
thicknessaaaaaaaaaa
electrical conductivityaaaaaaaaaa
tensile strengthaaaaaaaaaa
Login to view more

Abstract

The invention discloses a porous lithium-ion battery separator based on cross-linked and linear polymers, a preparation method and application thereof. The specific preparation method is: mix polyvinylidene fluoride-hexafluoropropylene, (meth)acrylate monomer, octavinyl polyhedral oligomerized silsesquioxane crosslinking agent and nano-oxidizing agent in a suitable solvent, and Free radical polymerization forms a gel polymer film with a cross-linked structure, and after the porogenic effect of nano-zinc oxide, its ionic conductivity reaches 1.4×10 at 25°C. ‑3 S / cm, the tensile strength reaches 16 MPa, and has excellent dimensional stability. The lithium-ion battery diaphragm obtained by the invention can greatly improve the ion conductivity, and also significantly improve the high-rate charge and discharge 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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Patents(China)
IPC IPC(8): H01M50/403H01M50/417H01M50/411H01M50/446H01M10/0525H01M50/40H01M50/497
CPCH01M10/0525H01M50/403H01M50/411Y02E60/10
Inventor 张明祖顾陆铭何金林倪沛红
Owner SUZHOU UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap