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

Heat shrinkage-resistant lithium ion battery diaphragm and extractant composition used by diaphragm

A lithium-ion battery and extractant technology, which is applied in battery pack parts, secondary batteries, circuits, etc., can solve problems such as affecting the performance of battery separators, poor porogen occupancy, and porogen residues.

Active Publication Date: 2017-01-11
LIAOYUAN HONGTU LI ION BATTERY DIAPHRAGM TECH
View PDF6 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] There are some defects in the traditional battery separator wet preparation process, including: using a single liquid or oily organic substance as a pore-forming agent, the porosity of the pore-forming agent is poor, and the shape and size of the micropore structure in the battery separator are almost completely determined by the subsequent process. It is determined by the stretching process, the controllability is poor, and the porosity and air permeability of the prepared battery separator are low; a single organic solvent is used as the extraction agent, such as dichloromethane, the extraction is not complete, and there are still some components in the battery separator. Pore ​​agent residues not only cause low porosity and air permeability of the battery separator, but also affect the performance of the battery 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
  • Heat shrinkage-resistant lithium ion battery diaphragm and extractant composition used by diaphragm
  • Heat shrinkage-resistant lithium ion battery diaphragm and extractant composition used by diaphragm
  • Heat shrinkage-resistant lithium ion battery diaphragm and extractant composition used by diaphragm

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0167] The composition for preparing the heat-shrinkable lithium-ion battery separator includes the following components by weight:

[0168]

[0169] in,

[0170] The number average molecular weight of high molecular polyethylene is 500,000,

[0171] The number average molecular weight of UHMWPE is 1.4 million,

[0172] The average molecular weight of white oil is 200,

[0173] The particle size of the nano-magnesium chloride is 50-70nm.

[0174]Prepare heat-shrinkable lithium-ion battery separators as follows:

[0175] Step 1), extrusion: mix high molecular weight polyethylene and magnesium chloride nanoparticles uniformly, and mix ultra high molecular weight polyethylene, 4,4-thiobis(6-tert-butyl m-cresol), 2,4-dihydroxy Benzophenone, sodium stearyl quaternary ammonium and Tween 80 are mixed evenly, and the above two mixtures are respectively put into the extruder to be heated and melted through two polyethylene composition feed ports, and two Put white oil into the ...

Embodiment 2

[0182] The composition for preparing the heat-shrinkable lithium-ion battery separator includes the following components by weight:

[0183]

[0184] in,

[0185] The number average molecular weight of high molecular weight polyethylene is 300,000,

[0186] The number average molecular weight of UHMWPE is 1.3 million,

[0187] The average molecular weight of white oil is 180,

[0188] The particle size of the nano-magnesium chloride is 60-90nm.

[0189] Prepare heat-shrinkable lithium-ion battery separators as follows:

[0190] Step 1), extrusion: mix high molecular polyethylene and magnesium chloride nanoparticles evenly, and ultra high molecular polyethylene, 3,5-di-tert-butyl-4-hydroxytoluene, 4-benzoyloxy-2, 2,6,6-Tetramethylpiperidine, octadecyl quaternary ammonium sodium and lauric acid are mixed evenly, and the above two mixtures are respectively fed into the extruder from two polyethylene composition feed ports to be heated and melted, and then extruded On the ...

Embodiment 3

[0197] The method used in this example is similar to the method used in Example 2, the only difference being that the composition used to prepare the heat-shrinkable lithium-ion battery separator includes the following components by weight:

[0198]

[0199] in,

[0200] The number average molecular weight of high molecular polyethylene is 400,000,

[0201] The number average molecular weight of UHMWPE is 1.4 million.

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
Average pore sizeaaaaaaaaaa
Average pore sizeaaaaaaaaaa
Apertureaaaaaaaaaa
Login to View More

Abstract

The invention discloses a heat shrinkage-resistant lithium ion battery diaphragm, a production method of the diaphragm, and an extractant composition used by the diaphragm. The extractant composition comprises a first extractant and a second extractant, the first extractant is a mixture comprising dichloromethane and phosphate ester, and the second extractant is water. The extractant composition provided the invention has a complete extraction effect on pore forming agents, and realizes less residual of the pore forming agents, and the battery diaphragm with good comprehensive performances can be produced from the pore forming agent, a specific pore forming agent and a specific ratio of macromolecular polyethylene and ultra-macromolecular polyethylene through a specific device by using a processing technology.

Description

technical field [0001] The invention relates to a preparation process of a battery diaphragm, in particular to a heat-shrinkable lithium-ion battery diaphragm, a preparation method thereof and an extractant composition used. Background technique [0002] Lithium-ion batteries are widely used in the fields of electronic communication, energy storage, and power supply. They are mainly composed of positive electrodes, negative electrodes, electrolytes, and battery separators. And the short circuit allows the electrolyte ions to pass through at the same time, thereby generating current. The current battery separator is mostly a polyethylene composition film with a microporous structure, and its performance determines the interface structure and internal resistance of the battery, which directly affects the capacity and cycle of the battery. As well as safety performance and other characteristics, a battery separator with excellent performance plays an important role in improving...

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): H01M2/16H01M10/0525H01M50/446
CPCH01M10/0525H01M50/446Y02E60/10
Inventor 张汉鸿
Owner LIAOYUAN HONGTU LI ION BATTERY DIAPHRAGM TECH
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