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

A kind of diaphragm for lithium ion battery and preparation method thereof

A lithium-ion battery and separator technology, applied in the field of lithium-ion battery separators and their preparation, can solve the problems of electrode damage, inability to prepare ultra-thin ceramic separators, multi-coating amount, etc., and achieve improved energy density and good electrochemical stability. The effect of improving the tensile strength and puncture strength of fluid absorption and storage capacity

Active Publication Date: 2019-11-19
浙江谜蝶新材料有限公司
View PDF6 Cites 1 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in order to achieve a continuous porous structure of granular materials, a large amount of coating is required, so it is impossible to prepare ultra-thin ceramic separators.
At the same time, the oxide with higher hardness is easy to cause damage to the electrode during charging and discharging.

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
  • A kind of diaphragm for lithium ion battery and preparation method thereof
  • A kind of diaphragm for lithium ion battery and preparation method thereof
  • A kind of diaphragm for lithium ion battery and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] (1) 3wt.%AlCl 3 ·6H 2 O with 97wt.% Al 2 o 3 ·H 2 O nanometer fine scales were mixed, added 5wt.% deionized water, and the mechanical ball milling was 5 hours under the rotating speed of 450rpm, to Al 2 o 3 ·H 2 Surface modification of O nanoscale fine scales, the surface modified Al 2 o 3 ·H 2 O nano fine scales have good hydrophilicity and good dispersion in deionized water medium;

[0043] (2) Surface modified Al 2 o 3 ·H 2 O nanometer fine scales are added to the mixed aqueous solution with a concentration of 10wt.% CMC and 5wt.% SBR, and the surface modification Al 2 o 3 ·H 2 The solid content of O nanometer fine flakes in the slurry is 55wt.%, stirred and mixed into a uniform slurry at a temperature of 40° C.;

[0044] (3) Continuously extrude and coat the above-mentioned slurry on the surface of one side of a wet-process PE base film with a porosity of 51% and a thickness of 16.2 μm, and dry continuously at an oven temperature of 75-105°C at a dryi...

Embodiment 2

[0048] (1) 4wt.% AlCl 3 ·6H 2 O with 96wt.% Al 2 o 3 ·H 2 O nanofibers were mixed, added with 8wt.% deionized water, and mechanically milled at 450rpm for 5 hours. 2 o 3 ·H 2 O nanofibers for surface modification. Surface modified Al 2 o 3 ·H 2 O nanofibers have good hydrophilicity and good dispersion in deionized water medium;

[0049] (2) Surface modified Al 2 o 3 ·H 2 O nanofibers were added to a mixed aqueous solution with a concentration of 10wt.% CMC and 5wt.% SBR, and the surface was modified by Al 2 o 3 ·H 2 The solid content of O nanofibers in the slurry is 60wt.%, stirred and mixed into a uniform slurry at a temperature of 40°C;

[0050] (3) Continuously extrude and coat the above-mentioned slurry on one surface of a dry-process PP base film with a porosity of 46% and a thickness of 16.1 μm, and dry continuously at an oven temperature of 75-105° C. at a drying speed of 40 m / min. Deionized water volatilizes and forms pores, and Al is modified after dr...

Embodiment 3

[0053] (1) 6wt.% AlCl 3 ·6H 2 O with 94wt.% Al 2 o 3 ·H 2 O nanometer fine scales were mixed, added 10wt.% deionized water, and mechanically milled for 5 hours at a speed of 450rpm, to Al 2 o 3 ·H 2 O nanoscale fine scales for surface modification. Surface modified Al 2 o 3 ·H 2 O nano fine scales have good hydrophilicity and good dispersion in deionized water medium;

[0054] (2) Surface modified Al 2 o 3 ·H 2 O nanometer fine scales are added to the mixed aqueous solution with a concentration of 10wt.% CMC and 5wt.% SBR, and the surface modification Al 2 o 3 ·H 2 The solid content of the O nanometer fine scales in the slurry is 65wt.%, stirred and mixed into a uniform slurry at a temperature of 40° C.;

[0055] (3) Continuously extrude and coat the above slurry on one surface of a wet-process PE base film with a porosity of 48% and a thickness of 12.3 μm, and dry continuously at an oven temperature of 75-105°C at a drying speed of 40m / min. Deionized water vo...

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
lengthaaaaaaaaaa
Login to View More

Abstract

The invention discloses a diaphragm used for a lithium ion battery. The diaphragm comprises a base material, and also comprises an ultra-thin porous soft ceramic layer compounded on at least one surface of the base material; and the ultra-thin porous soft ceramic layer comprises a porous structure which is formed by a blend of boehmite nanometer fine flakes or boehmite nanofibers and aluminium hydroxide through crossing and tiling, with a thickness of 0.5-1.0[mu]m. According to the diaphragm for the lithium ion battery provided by the invention, the tensile strength and the puncture strength of the diaphragm are both remarkably improved, and the thermal shrinkage of the diaphragm is greatly lowered; and the lithium ion battery prepared from the diaphragm is high in safety and excellent in cycling stability.

Description

technical field [0001] The invention relates to the technical field of lithium-ion battery separators, in particular to a separator for lithium-ion batteries and a preparation method thereof. Background technique [0002] Lithium-ion batteries are mainly composed of positive electrode materials, negative electrode materials, separators and electrolytes, and the separator is one of its core key materials. The performance of the separator determines the interface structure and internal resistance of the battery, which directly affects the capacity, cycle and safety performance of the battery. A separator with excellent performance plays an important role in improving the overall performance of the battery. The main function of the diaphragm is to separate the positive and negative electrodes of the battery, prevent the two electrodes from contacting and short circuit, and also have the function of allowing electrolyte ions to pass through. However, when lithium-ion batteries ...

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): H01M2/14H01M2/16H01M10/0525
CPCH01M10/0525H01M50/403H01M50/411H01M50/431H01M50/44H01M50/449Y02E60/10
Inventor 王秀丽梁文明黄丁岚黄亚东涂江平
Owner 浙江谜蝶新材料有限公司
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