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Novel lithium ion battery diaphragm with inorganic coating and preparation method thereof

A technology for lithium-ion batteries and inorganic coatings, applied in coatings, battery pack components, circuits, etc., can solve problems such as the limitation of the electrical performance of the separator and the reduction of the mechanical performance of the separator, and achieve improved electrolyte wettability and increased porosity , the effect of simple operation

Inactive Publication Date: 2015-04-08
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Recent studies have found that although the ceramic coating can improve the heat resistance of the separator, the electrical performance of the separator is limited due to the close packing of nano-ceramic particles in the pore structure of the bottom membrane, such as the decrease of the ionic conductivity of the separator and the decrease of the coating. The amount of binder in the membrane slurry or increasing the particle size of ceramic particles is beneficial to improve the overall performance of the separator
The study found that when the mass fraction of the binder in the slurry was reduced from 70% to 10%, the lithium ion conductivity of the separator increased from 0.25mS.cm -1 Rise to 0.91mS.cm -1 , but continuing to reduce the amount of binder will lead to a significant decrease in the mechanical properties of the separator

Method used

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  • Novel lithium ion battery diaphragm with inorganic coating and preparation method thereof
  • Novel lithium ion battery diaphragm with inorganic coating and preparation method thereof
  • Novel lithium ion battery diaphragm with inorganic coating and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0035] Slowly add 0.75g of sodium carboxymethylcellulose into 200ml of water, and mix evenly by ball milling at room temperature. Add 5g of titanium sol (concentration about 28wt%) to the above solution, and ball mill and stir for 2h. Then add 10g of MFI zeolite particles (with a particle size of about 2 μm) to the above solution, continue ball milling for 2 hours to obtain a uniformly mixed milk-like suspension, and obtain a white uniform coating slurry after vacuum defoaming treatment. Use a dip coating machine to coat the above slurry on both sides of the polyester non-woven fabric (weight 25 g / m2, thickness 30 μm, porosity 70%, uniform pore size distribution, average pore size 10 μm), and the dipping time is 180s , the pulling speed is 0.5cm / s, dipping once. After coating, it was dried in a constant temperature oven at 40° C. for 5 hours, and then dried in an oven at 120° C. for 3 hours to obtain an inorganic-coated lithium-ion battery separator.

[0036] In this example...

Embodiment 2

[0038] Slowly add 1.0 g of sodium carboxymethylcellulose into 200 ml of water, and mix evenly by ball milling at room temperature. Add 7.5g of silica sol (concentration about 28wt%) to the above solution, and ball mill and stir for 2h. Then add 13.5g NaA zeolite particles (particle size is about 2.5μm) to the above solution, continue ball milling for 2 hours to obtain a uniformly mixed milky suspension, and obtain a white uniform coating slurry after vacuum defoaming treatment. Using a dip coating machine, polyester non-woven fabric (gram weight 17 g / square meter, thickness 20 μm, porosity 65%, pore size distribution uniform, average pore size 18 μm, see figure 1 ) before and after coating the above slurry, the dipping time is 120s, the pulling speed is 0.5cm / s, dipping once. After coating, it was dried in a constant temperature oven at 40° C. for 5 hours, and then dried in an oven at 120° C. for 3 hours to obtain an inorganic-coated lithium-ion battery separator.

[0039] I...

Embodiment 3

[0042] Slowly add 2.0 g of sodium carboxyethyl cellulose into 200 ml of water, and mix evenly by ball milling at room temperature. Add 8g of silica sol (concentration is about 30wt%) to the above solution, and ball mill and stir for 2h. Then add 20g of NaA zeolite particles (with a particle size of about 2.5μm) to the above solution, continue ball milling for 2 hours to obtain a uniformly mixed milky suspension, and obtain a white uniform coating slurry after vacuum defoaming treatment. Use a dip coating machine to coat the above slurry on both sides of the porous polypropylene base film (thickness 22 μm, porosity 40%, uniform pore size distribution, average pore size 1.0 μm), the dipping time is 180s, and the pulling speed is 0.5cm / s, soak once. After coating, it was dried in a constant temperature oven at 40° C. for 5 hours, and then dried in an oven at 100° C. for 3 hours to obtain an inorganic-coated lithium-ion battery separator.

[0043] In this example, the technical...

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Abstract

The invention relates to the field of lithium ion battery diaphragm preparation, and particularly relates to a novel high-temperature-resistant lithium ion battery diaphragm with an inorganic coating, and a preparation method of the diaphragm. The lithium ion battery diaphragm comprises a porous flexible base diaphragm, and a coating coated on both sides of the base diaphragm, wherein the coating is a mixture containing zeolite particles and a bonding agent. The preparation method comprises the steps of dispersing the zeolite particles and the bonding agent in a solvent according to certain ratio to obtain uniform coating slurry; depositing the slurry on both sides of the flexible organic base diaphragm; and drying at certain temperature to obtain the composite diaphragm with good performances. According to the invention, the zeolite particles have excellent performances, high hydrophilicity, developed three-dimensional porous structure and are of an aluminosilicate crystalline structure, so that the high temperature resistance and electrolyte wettability of the diaphragm are improved greatly; and the composite lithium ion battery diaphragm prepared by the method has the advantages of excellent comprehensive performance and the like, and is suitable for large-scale and large-size production.

Description

technical field [0001] The invention relates to the field of lithium-ion battery diaphragm preparation, in particular to a high-temperature-resistant lithium-ion battery diaphragm with a novel inorganic coating and a preparation method thereof. Background technique [0002] Lithium-ion batteries have become the main power source of various portable electronic products due to their advantages such as high working voltage, high energy density, no memory effect, long cycle life and low self-discharge. With the establishment of the national "Energy Saving and New Energy Automobile Industry Development Plan", lithium-ion batteries and related materials will develop rapidly. [0003] Lithium-ion batteries are composed of four parts: positive electrode, negative electrode, electrolyte and separator. As the key material of lithium-ion batteries, the current commercialized lithium battery separators are mainly polyethylene and polypropylene microporous membranes, but due to the limi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M2/16C09D1/00
CPCY02E60/10
Inventor 肖伟赵丽娜刘建国严川伟
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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