Unlock instant, AI-driven research and patent intelligence for your innovation.

Nano plasticized porous polyethylene dry-stretched film for lithium ion batteries and preparation method thereof

A lithium-ion battery, polyethylene technology, applied in battery pack parts, circuits, electrical components, etc., can solve problems such as being unsuitable for large-scale industrial production, large production line investment, environmental pollution, etc., and achieve low cost and uniform pore size distribution. , The effect of low film forming temperature

Active Publication Date: 2016-10-12
HENAN NORMAL UNIV +1
View PDF6 Cites 9 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method can obtain a membrane with uniform pore size and pore distribution, but it is not suitable for large-scale industrial production due to the use of a large amount of organic solvents, which pollutes the environment and requires a large production line investment.

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
  • Nano plasticized porous polyethylene dry-stretched film for lithium ion batteries and preparation method thereof
  • Nano plasticized porous polyethylene dry-stretched film for lithium ion batteries and preparation method thereof
  • Nano plasticized porous polyethylene dry-stretched film for lithium ion batteries and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] The nano-plasticized porous polyethylene dry-process stretched film for lithium-ion batteries in this embodiment is mainly made of the following raw materials in the following mass percentages by dry-process biaxial stretching: 1,3:2,4-dibenzylidene sorbitol (DBS) 3.1%, 2,5-dimethyl-2,5-bis(tert-butylperoxy)hexane 0.52%, diisooctyl phthalate (DIOP) 1.0%, the balance is high density Polyethylene (HDPE).

[0036] The preparation method of the nano-plasticized porous polyethylene dry-stretched film for the lithium-ion battery of the present embodiment comprises the following steps:

[0037] 1) Take 65g of 1,3:2,4-dibenzylidene sorbitol (DBS), dissolve it in acetone to make a solution;

[0038] Take 2.0kg of high-density polyethylene, the above solution, 11g of 2,5-dimethyl-2,5-bis(tert-butylperoxy)hexane, and 21g of diisooctyl phthalate (DIOP), and add it to Mix in a twin-screw extruder, melt and extrude at 160°C, and then cool to 50°C on a cooling roll to cast into thic...

Embodiment 2

[0041] The nano-plasticized porous polyethylene dry-process stretched film for lithium-ion batteries in this embodiment is mainly made of the following raw materials in mass percentages by dry-process biaxial stretching: 3.9% nanoparticle nucleating agent, 2,5-dimethyl Base-2,5-bis(tert-butylperoxy)hexyne-30.94%, dibutyl maleate (DMB) 0.94%, and the balance is high-density polyethylene (HDPE).

[0042] Wherein, the nanoparticle nucleating agent is a nanopowder modified on the surface of vinyltriethoxysilane; the nanopowder is potassium stearate with an average particle diameter of 80nm; the vinyltriethoxysilane used The quality is 4% of potassium stearate quality.

[0043] The preparation method of the nano-plasticized porous polyethylene dry-stretched film for the lithium-ion battery of the present embodiment comprises the following steps:

[0044] 1) Take 80g of nanopowder (potassium stearate), and first use 3.2g of vinyltriethoxysilane for surface modification to obtain a ...

Embodiment 3

[0048] The nano-plasticized porous polyethylene dry-process stretched film for lithium-ion batteries in this embodiment is mainly made of the following raw materials in the following mass percentages by dry-process biaxial stretching: 4.9% nanoparticle nucleating agent, α,α-bis( tert-butyl peroxy) dicumyl 0.93%, diisobutyl maleate (DIMB) 1.4%, and the balance is high-density polyethylene (HDPE).

[0049] Wherein, the nanoparticle nucleating agent is a nanopowder modified on the surface of isopropyl tris (dioctyl phosphate acyloxy) titanate; the nanopowder is calcium stearate with an average particle diameter of 75nm The quality of the used isopropyl tris (dioctyl phosphate acyloxy) titanate is 5% of the calcium stearate quality.

[0050] The preparation method of the nano-plasticized porous polyethylene dry-stretched film for the lithium-ion battery of the present embodiment comprises the following steps:

[0051] 1) Take 100g of nano-powder (calcium stearate), and first use ...

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
The average particle sizeaaaaaaaaaa
The average particle sizeaaaaaaaaaa
The average particle sizeaaaaaaaaaa
Login to View More

Abstract

The invention discloses a nano plasticized porous polyethylene dry-stretched film for lithium ion batteries and a preparation method thereof. The polyethylene dry-stretched film is made mainly from the following materials in percent by weight: 3-10% of a nucleating agent, 0.4-2% of a crosslinking agent, 0.9-3% of a plasticizing agent and the balance of polyethylene resin; the nucleating agent is an organic nucleating agent or nano powder nucleating agent; the organic nucleating agent is 1,3:2,4-dibenzylidene sorbitol; the nano powder nucleating agent is nano powder subjected to coupling agent surface modification. The nucleating agent functions as a polyethylene crosslinking point, stereoscopic meshed structure is obtained after initiation by the crosslinking agent, uniform craze is generated in polyethylene in early stretching stage, and the craze is torn into uniform pores after continued stretching; the porous polyethylene dry-stretched film has moderate average pore diameter, has a thickness of 8-25 Mum, has good breathability and has a small range between surface longitudinal and transverse breathability degrees so that the cycle life of a battery is prolonged.

Description

technical field [0001] The invention belongs to the technical field of diaphragms for lithium-ion batteries, in particular to a nano-plasticized porous polyethylene dry-stretched film for lithium-ion batteries, and also relates to a dry-stretched nano-plasticized porous polyethylene for lithium-ion batteries Membrane preparation method. Background technique [0002] Lithium-ion battery separator, lithium-ion battery positive / negative electrode materials, electrolyte and battery casing packaging materials are the four major components of lithium-ion batteries. The battery separator mainly separates the positive and negative electrodes during the charging and discharging process of lithium ions to prevent the battery from short circuit, make sure that the Li + Passability, to ensure the smooth flow of the internal circuit of the battery. Most commercial lithium-ion battery separators are made of polyethylene or polypropylene, because polyolefins have good mechanical properti...

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
IPC IPC(8): H01M2/16H01M2/14H01M50/403H01M50/411H01M50/417H01M50/489
CPCH01M50/403H01M50/411Y02E60/10
Inventor 杨书廷谷继峰尹艳红曹相杰刘振峰董红玉
Owner HENAN NORMAL UNIV