High solid content aqueous ceramic slurry and processing method of lithium ion battery separator

A lithium-ion battery, high solid content technology, used in battery pack parts, circuits, electrical components, etc., can solve the problems of diaphragm volume change, diaphragm shrinkage, low efficiency, etc., to improve production efficiency, improve efficiency, and reduce energy. consumption effect

Active Publication Date: 2016-06-22
SHENZHEN SENIOR TECH MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the separators used in lithium-ion batteries are generally polyolefin-based porous membranes. Since the melting point of such polyolefin-based porous membranes is lower than 200°C, they have the following defects: when the battery temperature increases due to internal or external factors, this The diaphragm shrinks or melts, causing the volume of the diaphragm to change
However, the current commercially available water-based ceramic slurry has a solid content of only 40% and a moisture content of up to 60%, which results in high energy consumption and low efficiency during production and use.

Method used

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  • High solid content aqueous ceramic slurry and processing method of lithium ion battery separator

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Embodiment 1

[0038]A high-solid-content water-based ceramic coating for lithium-ion batteries: comprising 65% of the composition calculated by weight percentage and 50% of water; wherein, the composition includes 5 parts of polyacrylic acid emulsion thickener calculated by weight percentage, carbon 12 parts of nanotubes, 5 parts of water-based dispersant polyethylene glycol, 5 parts of water-based wetting agent alkylphenol polyoxyethylene ether, 10 parts of water-based latex polymethyl methacrylate and D50 is 4μm, BET is 2m 2 80 parts per gram of silicon dioxide granules and ceramic granules.

[0039] The method for preparing described high solid content aqueous ceramic slurry; comprises following preparation steps:

[0040] (1), said amount of deionized water is first added to the pre-mixing tank, adjust the pH value to 8-9, add the amount of polymer emulsion thickener polyacrylic acid emulsion, water-based dispersant polyethylene glycol, stir Until the dissolution is complete, the mixtu...

Embodiment 2

[0044] A high-solid content water-based ceramic coating for lithium-ion batteries: comprising 55% of the composition and 45% of water calculated by weight percentage; wherein, the composition includes 3 parts of polymethacrylic acid emulsion thickener calculated by weight percentage , water-based dispersant sodium polyacrylate 0.2 parts, water-based wetting agent fatty alcohol polyoxyethylene ether 0.2 parts, water-based latex polybutylmethacrylate 2 parts and D50 is 0.8μm, BET is 8m 2 100 parts / g aluminum oxide ceramic particles.

[0045] The method for preparing the high-solid content water-based ceramic slurry is the same as in Example 1, except that the dispersion speed is 60 r / min.

Embodiment 3

[0047] A high solid content water-based ceramic coating for lithium-ion batteries: comprising 60% of the composition calculated by weight percentage and 40% of water; wherein, the composition includes 0.5 parts of polyacrylate copolymer emulsion thickener calculated by weight percentage , water-based dispersant potassium polyacrylate 3 parts, water-based wetting agent fatty acid polyoxyethylene ether 1 part, water-based latex polyethyl acrylate 8 parts and D50 is 0.6μm, BET is 12m 2 85 parts / g boehmite ceramic particles.

[0048] The method for preparing the high-solid content water-based ceramic slurry is the same as in Example 1, except that the dispersion speed is 40 r / min.

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Abstract

The invention discloses a high-solid-content aqueous ceramic slurry for lithium-ion battery separators, which comprises 50-65% of a composition calculated by weight percentage and 35-50% of water; 0.1-5 parts of polymer emulsion thickener, 1-10 parts of carbon nanotubes, 0.1-5 parts of water-based dispersant, 0.1-5 parts of water-based wetting agent, 1-10 parts of water-based latex and 80-100 parts of ceramic particles. The invention also discloses a processing method of the above-mentioned high-solid-content aqueous ceramic slurry. The invention has the advantages of high solid content and good product stability.

Description

technical field [0001] The invention relates to lithium-ion batteries, in particular to a high-solid-content water-based ceramic slurry for lithium-ion battery separators and a processing method thereof. Background technique [0002] In the structure of lithium-ion batteries, the main function of the separator is to separate the positive and negative electrodes of the battery and prevent the two electrodes from contacting and short-circuiting. It is one of the key inner components. The performance of the separator determines the interface structure and internal resistance of the battery, which directly affects the capacity, cycle and safety performance of the battery. A separator with excellent performance plays an important role in improving the overall performance of lithium-ion batteries. [0003] At present, the separators used in lithium-ion batteries are generally polyolefin-based porous membranes. Since the melting point of such polyolefin-based porous membranes is lo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/63H01M2/16H01M50/434
CPCY02E60/10
Inventor 谭斌杨佳富苗发成鲁东奎吴术球陈秀峰
Owner SHENZHEN SENIOR TECH MATERIAL
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