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

Ceramic coating diaphragm for lithium battery and preparation method of ceramic coating diaphragm

A ceramic coating and lithium battery technology, which is applied to battery pack parts, circuits, electrical components, etc., can solve the problem of high specific surface energy of ultrafine alumina powder, low powder shedding and uniformity, uneven coating thickness, etc. problems, to achieve the effect of strong absorption and retention of electrolyte, good air permeability and high peeling force

Inactive Publication Date: 2015-01-07
SHANGHAI ELECTRICGROUP CORP
View PDF4 Cites 51 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, some ceramic diaphragms have problems such as powder falling and low uniformity. The main reason is that on the one hand, the ultrafine alumina powder has a large specific surface energy and high surface activity, and a single ultrafine particle is often in an unstable state. Attract each other and reunite to form larger agglomerated particles, which will have a negative impact on the subsequent coating process; on the other hand, there are defects in the control of coating accuracy, the coating thickness is uneven, and the coating quality is not high

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
  • Ceramic coating diaphragm for lithium battery and preparation method of ceramic coating diaphragm
  • Ceramic coating diaphragm for lithium battery and preparation method of ceramic coating diaphragm
  • Ceramic coating diaphragm for lithium battery and preparation method of ceramic coating diaphragm

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0036] Its preparation method comprises the following steps:

[0037] Step 1, take the particle size ratio D 1 / D 2 Nano-alumina powder of 0.10-0.20 is dispersed in deionized water to prepare a nano-alumina aqueous dispersion;

[0038] Step 2, mix the nano-alumina aqueous dispersion with adhesives, additives, additives to reduce the surface tension of the slurry and eliminate micro-bubbles, and configure the ceramic coating slurry, wherein the mass ratio of alumina: adhesive 5~20:1;

[0039] Step 3, uniformly coating the ceramic coating slurry on the surface of the substrate separator to obtain a ceramic coated separator for lithium batteries.

[0040] The embodiment of the present invention has good air permeability, high peeling force, strong ability to absorb and retain electrolyte, and heat shrinkage performance, which is beneficial to the improvement of the capacity retention rate of the battery and improves the cycle life of the battery.

[0041] In the embodiment of...

Embodiment 1

[0044] A preparation method for a ceramic-coated diaphragm for an energy storage lithium battery, comprising the following steps;

[0045]Step 1. Take 2g of alumina with D1 of 50nm and 8g of alumina with D2 of 400nm, add them to 40g of deionized water, first stir at high speed for 30min, and then ultrasonically disperse for 30min to obtain a pre-dispersion of nano-alumina. The dispersant with a mass fraction of 0.5% is added to the pre-dispersion liquid, including: sodium dodecylbenzenesulfonate 0.125g, octylphenol polyoxyethylene 0.063g and polyacrylic acid 0.063g, the amount ratio of the three is 2:1 :1. Stir the pre-dispersion at high speed for 30 minutes, then add a small amount of dilute hydrochloric acid solution and dilute sodium hydroxide solution to adjust the pH value of the dispersion to 4-5;

[0046] The above-mentioned pre-dispersion liquid was ball-milled in a ball mill for 2 hours to obtain a uniform and stable nano-alumina aqueous dispersion.

[0047] Step 2,...

Embodiment 2

[0056] A ceramic-coated diaphragm for an energy storage lithium battery and a preparation method thereof, comprising the following steps;

[0057] Step 1: Take 4g of alumina with D1 of 80nm and 6g of alumina with D2 of 500nm, add them to 30g of deionized water, first stir at high speed for 30min, and then ultrasonically disperse for 30min to obtain a pre-dispersion of nano-alumina. The dispersant with a mass fraction of 1.0% is added to the pre-dispersion liquid, including: 0.20 g of sodium dodecylbenzenesulfonate, 0.10 g of octylphenol polyoxyethylene and 0.10 g of polyacrylic acid, and the ratio of the three is 2:1 :1. Stir the pre-dispersion at high speed for 30 minutes, then add a small amount of dilute hydrochloric acid solution and dilute sodium hydroxide solution to adjust the pH value of the dispersion to 4-5;

[0058] The above-mentioned pre-dispersion liquid was ball-milled in a ball mill for 2 hours to obtain a uniform and stable nano-alumina aqueous dispersion.

...

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
Thicknessaaaaaaaaaa
Thicknessaaaaaaaaaa
Login to View More

Abstract

The invention discloses a ceramic coating diaphragm for a lithium battery and a preparation method of the ceramic coating diaphragm, and belongs to the technical field of batteries. The ceramic coating diaphragm comprises a ceramic coating and a substrate diaphragm, wherein the ceramic coating is prepared by uniformly coating the substrate diaphragm with water-based ceramic coating slurry; the ceramic coating slurry comprises components in percentage by weight as follows: 10%-30% of aluminum oxide, 0.5%-3% of a bonding agent, 0.2%-1.0% of an additive and 0.01%-0.1% of an auxiliary; and the aluminum oxide is nanometer aluminum oxide powder with the grain diameter ratio D1 / D2 of 0.10-0.20. According to the technical scheme, the safety of the ceramic coating diaphragm is improved, the wetting ability of electrolyte is improved, and the cycle life of the battery can be prolonged when the ceramic coating diaphragm is applied to the lithium battery.

Description

technical field [0001] The invention belongs to the technical field of lithium batteries, and relates to a lithium battery separator, in particular to a ceramic-coated separator for an energy storage lithium battery and a preparation method thereof. Background technique [0002] Due to its high voltage, high specific energy, long life, no memory effect, and small self-discharge, lithium-ion batteries not only have wide application and development prospects in mobile batteries and power batteries, but also in the development and research of grid energy storage. is also gradually gaining attention. Since grid energy storage requires energy storage technology to meet the requirements of large-scale, high cycle life, high efficiency, mass production and low cost, combined with the analysis of the performance of lithium-ion batteries, lithium-ion batteries have become a very promising grid energy storage. [0003] The lithium-ion battery separator is a key component of the lith...

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): H01M2/16
CPCH01M50/403H01M50/411H01M50/44Y02E60/10
Inventor 季文姣万玲玉刘佳丽廖文俊苏青
Owner SHANGHAI ELECTRICGROUP CORP
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