Sticky diaphragm for power battery and its preparation method

A power battery, viscous technology, applied in the direction of secondary batteries, battery pack parts, separators/films/diaphragms/spacers, etc. , poor safety and other problems, to achieve the effect of improving wettability and liquid absorption, improving heat shrinkage, and reducing heat shrinkage performance

Inactive Publication Date: 2018-05-15
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Power lithium-ion batteries have higher and higher requirements for battery safety performance. With the increase of energy density of lithium-ion batteries, the diaphragm is gradually becoming lighter and thinner. However, the gap between the existing lithium-ion diaphragm and the positive and negative electrodes is large, and the posi

Method used

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  • Sticky diaphragm for power battery and its preparation method
  • Sticky diaphragm for power battery and its preparation method
  • Sticky diaphragm for power battery and its preparation method

Examples

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Embodiment 1

[0037] A method for preparing a water-based adhesive diaphragm for a power battery, comprising the following steps:

[0038] S1, 100g Al 2 o 3 Mix powder, 0.6g dispersant, 1g defoamer and appropriate amount of water, stir for 2 hours at a speed of 1500r / min, then add 8g of binder, stir evenly at a speed of 600r / min, and obtain an inorganic solid with a mass fraction of 40% oxide predispersion;

[0039] S2. Coating the inorganic solid oxide predispersion on a polyethylene film with a thickness of 12 μm, and drying to obtain a first separator with a coating thickness of 4 μm;

[0040] S3. Add an appropriate amount of wetting agent and 5 g of adhesion promoter to 100 g of aqueous polyvinylidene fluoride solution, and stir evenly at a speed of 500 r / min to obtain a viscous slurry with a mass fraction of 20%, and the weight of the viscous slurry and wetting agent The ratio is 100:0.4;

[0041] S4. Apply the viscous slurry to the surface of the first separator by gravure coating...

Embodiment 2

[0044] A method for preparing a water-based adhesive diaphragm for a power battery, comprising the following steps:

[0045] S1, 100g Al 2 o 3 Powder, 0.5g dispersant, 0.8g defoamer and appropriate amount of water were stirred at a speed of 1500r / min for 2 hours, then 6g of binder was added, and stirred evenly at a speed of 600r / min to obtain an inorganic solid oxide with a mass fraction of 35%. substance pre-dispersion;

[0046] S2. Coating the inorganic solid oxide predispersion on a polyethylene film with a thickness of 12 μm, and drying to obtain a first separator with a coating thickness of 3 μm;

[0047] S3. Add an appropriate amount of wetting agent and 3 g of adhesion promoter to 100 g of aqueous polyvinylidene fluoride solution, and stir evenly at 500 r / min to obtain a viscous slurry with a mass fraction of 15%, and the weight ratio of the viscous slurry to the wetting agent for 100:0.4;

[0048] S4. Apply the viscous slurry to the surface of the first separator b...

Embodiment 3

[0050] A method for preparing a water-based adhesive diaphragm for a power battery, comprising the following steps:

[0051] S1. Stir 100g boehmite powder, 0.5g dispersant, 0.8g defoamer and appropriate amount of water at a speed of 1500r / min for 2h, then add 6g of binder, stir evenly at a speed of 500r / min to obtain the mass fraction 30% inorganic solid oxide pre-dispersion;

[0052] S2. Coating the inorganic solid oxide predispersion on a polyethylene film with a thickness of 12 μm, and drying to obtain a first separator with a coating thickness of 2 μm;

[0053] S3. Add an appropriate amount of wetting agent and 3 g of adhesion promoter to 100 g of aqueous polyvinylidene fluoride solution, and stir evenly at a speed of 500 r / min to obtain a viscous slurry with a mass fraction of 15%, and the weight of the viscous slurry and wetting agent The ratio is 100:0.4;

[0054] S4. Apply the viscous slurry on both sides of the first separator by spraying, and dry to obtain a viscou...

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Abstract

The invention further discloses a sticky diaphragm for a power battery. At least one surface of a base film is coated with an oxide coating, and at least one surface of the base film coated with the oxide coating is coated with a sticky slurry layer. The invention further discloses a preparation method of the sticky diagram for the power battery, which includes steps of mixing inorganic solid oxide, assistant and water to obtain an inorganic solid oxide pre-dispersing fluid; coating the inorganic solid oxide pre-dispersing fluid on the surface of the base film, and drying to obtain a first diaphragm; mixing the sticky polymer solution, co-sticking agent, and wetting agent to obtain sticky slurry; coating the sticky slurry on the surface of the first diaphragm, drying to obtain the sticky diaphragm for the power battery. The sticky diaphragm adopts hydraulic sticky diaphragm as the power battery sticky diaphragm, positive and negative pole pieces of the electrode are bonded together, thus the sticky diaphragm can effectively avoid staggering of the diaphragm and a pole piece caused by battery falling and collision; the safety is high, the dead zone during the process of embedding and releasing a lithium ion is reduced; the sticky diaphragm is significant to improve the battery interface.

Description

technical field [0001] The invention relates to the technical field of power battery diaphragms, in particular to a viscous diaphragm for power batteries and a preparation method thereof. Background technique [0002] Lithium-ion batteries are widely used in large-scale applications such as national defense industry, electric industry, and space technology because of their advantages such as high energy density, high working voltage, long cycle life, and no memory effect. [0003] Lithium-ion batteries are mainly composed of positive and negative electrode materials, electrolyte, diaphragm, and casing. As one of the key materials of lithium-ion batteries, the diaphragm is characterized by blocking the positive and negative electrodes, preventing short circuit, allowing only lithium ions to pass through and not allowing electrons to pass through. The performance of the diaphragm determines the interface structure and internal resistance of the battery, which directly affects ...

Claims

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Application Information

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IPC IPC(8): H01M2/14H01M2/16H01M2/18H01M10/0525H01M50/40H01M50/403H01M50/411H01M50/417
CPCH01M10/0525H01M50/403H01M50/409H01M50/463Y02E60/10
Inventor 代北北张壁樊少娟
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY
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