Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Preparation method of novel diaphragm material for lithium ion battery

A technology for lithium-ion batteries and diaphragm materials, which is applied in the field of preparation of new diaphragm materials for lithium-ion batteries. It can solve the problems of backward production methods, high closed cell temperature, and low membrane rupture temperature, so as to improve safety and improve closed cells. temperature and membrane rupture temperature, and the effect of improving the resistance to electrolyte dissolution

Active Publication Date: 2016-02-24
浙江锂盾储能材料技术有限公司
View PDF3 Cites 3 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the technology and production methods of lithium-ion battery separators are still relatively backward, and there are still problems such as high closed cell temperature and low membrane rupture temperature, and the safety of the separator is low.

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] A preparation method for a novel diaphragm material for a lithium-ion battery, comprising the following steps:

[0017] Step 1: Blend nylon with polyester and polyolefin to obtain a mixture, put the mixture into an extruder at an extrusion temperature of 260°C, cool the extruded mixture at a cooling temperature of 5°C, and press it into tablets after cooling. stretching, the stretching pressure is: 25MPa, and the base film is obtained, and the thickness of the base film is 15 μm;

[0018] Step 2: Carry out surface polarity treatment to the base film;

[0019] Step 3: Coating an anti-corrosion fluorine-containing coating on the surface of the base film.

[0020] Wherein, the nylon material is a mixture of PA6, PA7 and PA9. The polyester accounts for 5% of the mass of the mixture, and the polyolefin accounts for 5% of the mass of the mixture. The polyester is polyethylene terephthalate. The method of surface polarity treatment is plasma treatment.

Embodiment 2

[0022] A preparation method for a novel diaphragm material for a lithium-ion battery, comprising the following steps:

[0023] Step 1: Blend nylon with polyester and polyolefin to obtain a mixture, put the mixture into an extruder at an extrusion temperature of 300°C, cool the extruded mixture at a cooling temperature of 20°C, and press it into tablets after cooling , Stretching, the stretching pressure is: 10MPa, the base film is obtained, and the thickness of the base film is 50 μm;

[0024] Step 2: Carry out surface polarity treatment to the base film;

[0025] Step 3: Coating an anti-corrosion fluorine-containing coating on the surface of the base film.

[0026] Wherein, the nylon material is a mixture of PA12, PA13, PA46, and PA-MXD6. The polyester accounts for 30% of the mass of the mixture, and the polyolefin accounts for 20% of the mass of the mixture. The polyester is polybutylene terephthalate. The method of surface polarity treatment is to oxidize the solvent to...

Embodiment 3

[0028] A preparation method for a novel diaphragm material for a lithium-ion battery, comprising the following steps:

[0029] Step 1: Blend nylon with polyester and polyolefin to obtain a mixture, put the mixture into an extruder at an extrusion temperature of 320°C, cool the extruded mixture at a cooling temperature of 30°C, and press it into tablets after cooling , Stretching, the stretching pressure is: 8MPa, makes base film, and described base film thickness is 60 μ m;

[0030] Step 2: Carry out surface polarity treatment to the base film;

[0031] Step 3: Coating an anti-corrosion fluorine-containing coating on the surface of the base film.

[0032] Wherein, the nylon material is a mixture of PA1010, PA6I, PA9T, and PA-MXD6. The polyester accounts for 50% of the mass of the mixture, and the polyolefin accounts for 30% of the mass of the mixture. The polyester is polybutylene terephthalate. The method of surface polarity treatment is plasma treatment.

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
thicknessaaaaaaaaaa
thicknessaaaaaaaaaa
Login to View More

Abstract

The invention provides a preparation method of a novel diaphragm material for a lithium ion battery, comprising the following steps: step 1: blending nylon, polyester and polyolefin to obtain a mixture, putting the mixture into an extruder having an extruding temperature of 260-320 DEG C, cooling the extruded mixture with a cooling temperature of 5-30 DEG C, after cooling, tabletting and stretching to obtain a base diaphragm, wherein the stretching pressure is 1MPa-301MPa, and the thickness of the base diaphragm is 15 mu. m-60mu. m; step 2: performing surface polarity treatment on the base diaphragm; step 3: coating the surface of the base diaphragm with an anticorrosion fluorine-containing coating layer. By adopting a nylon and polyester blended material as the base diaphragm, the pore closing temperature and diaphragm rupture temperature of the diaphragm can be effectively improved; by coating the surface of the base diaphragm with a fluorine coating material, the electrolyte dissolution resistance of the diaphragm can be effectively improved, and the safety of the diaphragm is enhanced; the novel diaphragm material is safe and can be applied by a battery cell.

Description

technical field [0001] The invention relates to the field of lithium battery diaphragm production, in particular to a method for preparing a novel diaphragm material for lithium ion batteries. Background technique [0002] Lithium-ion batteries are mainly composed of five materials: positive electrode material, negative electrode material, electrolyte, diaphragm material, and outer packaging material. Among them, the diaphragm material, as one of the most important components of the lithium-ion battery cell, has been receiving much attention. The diaphragm is a microporous film placed between the positive and negative electrodes of the battery. Its main function is to separate the positive and negative electrodes of the lithium battery to avoid short circuits. , and at the same time provide free channels for lithium ions to achieve a closed loop. In addition, the lithium-ion battery separator is a polymer functional membrane material with nano-scale micropores. It is requir...

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 Applications(China)
IPC IPC(8): H01M2/14H01M2/16H01M10/0525H01M50/403H01M50/446
CPCH01M10/0525H01M50/40H01M50/409H01M50/411H01M50/44H01M50/403Y02E60/10
Inventor 章结兵谢凤秀
Owner 浙江锂盾储能材料技术有限公司
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com