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
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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 stat

Method used

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  • 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

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[0036] The preparation method includes the following steps:

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

[0038] Step 2: Mix the nano-alumina aqueous dispersion with adhesives, additives, additives that 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 diaphragm to obtain a ceramic coating diaphragm 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 the present...

Example Embodiment

[0043] Example 1

[0044] The preparation method of ceramic-coated separator for energy storage lithium battery includes the following steps;

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

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

Example Embodiment

[0055] Example 2

[0056] Ceramic-coated diaphragm for energy storage lithium battery and preparation method thereof, including the following steps;

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

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

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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

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Application Information

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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
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