Honeycomb-shaped high-porosity and large-aperture lithium battery diaphragm and preparation method thereof

A lithium battery separator, high-porosity technology, applied in lithium batteries, battery pack parts, non-aqueous electrolyte batteries, etc., can solve the problem of unfavorable electrolyte penetration of ions, reduced battery electrochemical performance, and poor electrolyte affinity. and other problems, to achieve the effect of improving hydrophilicity, facilitating penetration and ion passage, and enhancing liquid absorption

Active Publication Date: 2021-08-31
JIANGSU HORIZON NEW ENERGY TECH CO LTD
View PDF0 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The traditional polyolefin battery separator has low porosity, poor affinity for electrolyte, and low liquid absorption of the separator. For example, the common range of PE separator porosity is between 38-47%, and the average pore diameter is about 30-45nm. The surface of the current commercial polyolefin lithium battery separator is relatively dense, which is not conducive t

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
  • Honeycomb-shaped high-porosity and large-aperture lithium battery diaphragm and preparation method thereof
  • Honeycomb-shaped high-porosity and large-aperture lithium battery diaphragm and preparation method thereof
  • Honeycomb-shaped high-porosity and large-aperture lithium battery diaphragm and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0027] Example 1

[0028] (1) A high density polyethylene and 30kg methyl cellulose, dioctyl phthalate, mixed aliphatic, moves the heating unit of the twin screw extruder, heated to form a homogeneous phase, a heating temperature of 175 deg.] C, incubated 2h, open gear pump, a uniform phase material extruded through a die to form a cast diaphragms.

[0029] (2) the cast piece separator immersed in an ethanol solution, extracted dioctyl phthalate, aliphatic, after extraction cast diaphragms removed, until the ethanol was completely evaporated, to obtain a honeycomb i.e. high porosity, large pore size lithium battery separator.

[0030] The lithium battery separator material was prepared for each group distribution ratio, mass fraction, 30 parts of high density polyethylene, methylcellulose, 1 part of dioctyl phthalate, 70 parts of fat.

Example Embodiment

[0031] Example 2

[0032] (1) A high density polyethylene and 30kg methyl cellulose, dioctyl phthalate, mixed aliphatic, moves the heating unit of the twin screw extruder, heated to form a homogeneous phase, a heating temperature of 175 deg.] C, incubated 2h, open gear pump, a uniform phase material extruded through a die to form a cast diaphragms.

[0033] (2) the cast piece separator immersed in an ethanol solution, extracted dioctyl phthalate, aliphatic, after extraction cast diaphragms removed, until the ethanol was completely evaporated, to obtain a honeycomb i.e. high porosity, large pore size lithium battery separator.

[0034] The lithium battery separator material was prepared for each group distribution ratio, mass fraction, 30 parts of high density polyethylene, 2 parts of methyl cellulose, dioctyl phthalate, 70 parts of fat.

Example Embodiment

[0035] Example 3

[0036] (1) A high density polyethylene and 30kg methyl cellulose, dioctyl phthalate, mixed aliphatic, moves the heating unit of the twin screw extruder, heated to form a homogeneous phase, a heating temperature of 175 deg.] C, incubated 2h, open gear pump, a uniform phase material extruded through a die to form a cast diaphragms.

[0037] (2) the cast piece separator immersed in an ethanol solution, extracted dioctyl phthalate, aliphatic, after extraction cast diaphragms removed, until the ethanol was completely evaporated, to obtain a honeycomb i.e. high porosity, large pore size lithium battery separator.

[0038] The lithium battery separator material was prepared for each group distribution ratio, mass fraction, high density polyethylene, 30 parts of methyl cellulose 5 parts dioctyl phthalate 70 parts fat.

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
Particle sizeaaaaaaaaaa
Apertureaaaaaaaaaa
Apertureaaaaaaaaaa
Login to view more

Abstract

The invention discloses a honeycomb-shaped high-porosity and large-aperture lithium battery diaphragm and a preparation method thereof. The preparation method comprises the following steps: uniformly mixing polyolefin, methyl cellulose and dioctyl phthalate, transferring to a heating unit of a double-screw extruder, heating to form a homogeneous phase, and extruding through a die head to form a cast sheet diaphragm; and immersing the cast sheet diaphragm into an extracting agent to extract the dioctyl phthalate, so as to prepare the honeycomb-shaped high-porosity and large-aperture lithium battery diaphragm. The surface of the lithium battery diaphragm is subjected to hydrophilic anti-aging treatment, specifically, the surface of the lithium battery diaphragm is coated with polydopamine for modification, then the modified lithium battery diaphragm and nanoscale graphene oxide are subjected to an acylation reaction under catalysis of diisopropyl carbodiimide, the surface of the lithium battery diaphragm is coated with a layer of graphene oxide, then amination treatment is conducted through adipic acid dihydrazide, so the surface hydrophilicity of the lithium battery diaphragm is enhanced. The lithium battery diaphragm prepared by the invention is high in porosity, large in aperture, excellent in compatibility with electrolyte, high in liquid absorption rate and strong in hydrophilicity.

Description

technical field [0001] The invention relates to the technical field of battery separators, in particular to a honeycomb high-porosity and large-aperture lithium battery separator and a preparation method thereof. Background technique [0002] As an important part of lithium batteries, the performance of lithium battery separators is related to the quality and performance of lithium batteries. Polyolefin materials are widely used in the field of lithium batteries due to their good chemical stability and mechanical properties. The traditional polyolefin battery separator has low porosity, poor affinity for electrolyte, and low liquid absorption of the separator. For example, the common range of PE separator porosity is between 38-47%, and the average pore diameter is about 30-45nm. The surface of the current commercial polyolefin lithium battery separator is relatively dense, which is not conducive to the penetration of the electrolyte and the passage of ions, which reduces th...

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): H01M50/403H01M50/414H01M50/489H01M50/491H01M10/052H01M6/14
CPCH01M50/403H01M50/414H01M50/489H01M50/491H01M10/052H01M6/14Y02E60/10
Inventor 刘科尚文滨陈朝晖
Owner JIANGSU HORIZON NEW ENERGY TECH CO LTD
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