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Ceramic coating with closed-cell properties and lithium ion battery diaphragm containing ceramic coating

A lithium-ion battery and ceramic coating technology, which is applied to battery components, circuits, electrical components, etc., can solve problems such as unevenness, pore size distribution of base film plugging, and achieve small thermal shrinkage, low closed cell temperature, The effect of high membrane rupture temperature

Inactive Publication Date: 2017-05-17
XUCHENG FUJIAN SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, after heating roller calendering treatment, the PE powder is melted, and the molecular chain segments are stretched freely, resulting in blocked pores or uneven pore size distribution of the base film, especially when the substrate is a polyolefin separator with low porosity.

Method used

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  • Ceramic coating with closed-cell properties and lithium ion battery diaphragm containing ceramic coating

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] The lithium-ion battery separator in this example includes a polyolefin microporous membrane and a ceramic coating with closed-pore performance coated on one side of the polyolefin microporous membrane. The preparation process of the coating slurry is as follows: 30g of aluminum oxide and 15g of low-density polyethylene particles modified by vinyltrimethoxysilane are added to a container containing 50g of N,N-dimethylacetamide , stir evenly, then add 5g of polyvinylidene fluoride, stir at high speed, and ball mill to form a slurry. Use a coating machine to coat the prepared slurry on a dry-process PP film with a thickness of 20 μm, an air permeability of 242s / 100ml, and a shrinkage rate of 3% at 130°C. Dry for 20min.

[0040] Wherein, the coupling agent modification treatment of Al2O3 comprises the following steps:

[0041] A: Dilute vinyltrimethoxysilane with ethanol and water. Wherein the volume ratio of vinyltrimethoxysilane, ethanol and deionized water is 20:72:8...

example 1

[0045] The air permeability, shrinkage rate and membrane rupture temperature of the membrane in Example 1 are shown in Table 1.

[0046] Table 1 Performance test of PP separator coated with closed-cell performance ceramic coating

[0047] Type of diaphragm Air permeability after baking (s / 100ml) 130℃ / 2h Shrinkage (%) Membrane rupture temperature (°C) PP film 263 3 175 Example 1 Plugging 0.75 226

[0048] It can be seen from Table 1 that a layer of ceramic coating with closed-cell performance is coated on one side of the PP separator, which has good low-temperature closed-cell performance and high membrane rupture temperature, and effectively improves the safety performance of lithium-ion batteries.

Embodiment 2

[0050] The lithium-ion battery separator in this example includes a polyolefin microporous membrane and a ceramic coating with closed-pore performance coated on one side of the polyolefin microporous membrane. The preparation process of the coating slurry is as follows: 30g of silicon dioxide and 15g of ethylene-vinyl acetate modified by 3-aminopropyltriethoxysilane are added to a container filled with 50g of N,N-dimethylacetamide In the container, stir evenly, then add 5g of polyvinylidene fluoride, stir at high speed, and ball mill to form a slurry. Use a coating machine to coat the prepared slurry on a dry-process PP film with a thickness of 20 μm, an air permeability of 242s / 100ml, and a shrinkage rate of 3% at 130°C. Dry for 20min.

[0051] The coupling agent modification treatment of silica is as in Example 1.

[0052] Diaphragm performance test as example 1.

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Abstract

The invention provides a ceramic coating with closed-cell properties. The ceramic coating is composed of the following components in percentage by mass: 20-30% of inorganic particle, 10-15% of low-melting-point high-polymer particle, 2-10% of adhesive and the balance of solvent. The invention also provides a lithium ion battery diaphragm which is composed of a polyolefin microporous membrane and a ceramic coating with closed-cell properties applied on one side of the polyolefin microporous membrane. The lithium ion battery diaphragm has the advantages of low closed-cell temperature, high membrane rupture temperature, small heat shrinkage and favorable binding property of the polyolefin base membrane, and can effectively enhance the safety performance of the lithium battery. The diaphragm preparation technique is simple, and is suitable for industrial production.

Description

technical field [0001] The invention relates to the technical field of lithium-ion battery separators, in particular to a ceramic coating with closed-cell performance and a lithium-ion battery separator containing the ceramic coating. Background technique [0002] With the promulgation of the "Development Plan for Energy Conservation and New Energy Automobile Industry" and the "Twelfth Five-Year Plan" for Electric Vehicle Technology Development, energy-saving and environmentally friendly new energy has become the main strategic orientation of my country's automobile industry. As an important part of electric vehicles, lithium-ion batteries are in increasing demand. As a key component of lithium-ion batteries, separators directly affect the capacity, cycle and safety performance of lithium batteries. Therefore, the development and research of high-performance separators is imperative. [0003] Lithium-ion battery separators mainly include polyolefin microporous membranes, po...

Claims

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Application Information

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IPC IPC(8): H01M2/16
CPCH01M50/411H01M50/431Y02E60/10
Inventor 刘峥郑守扬赵静
Owner XUCHENG FUJIAN SCI & TECH
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