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Preparation method of hydrophilic polyolefin diaphragm for lithium ion battery

A technology for polyolefin separators and lithium-ion batteries, applied in nanotechnology for materials and surface science, secondary batteries, battery pack components, etc., can solve the problems of poor hydrophilicity, low surface free energy, water-based slurry coating Problems such as the difficulty of covering polyolefin diaphragms, etc., achieve good air permeability, improve hydrophilicity, and reduce the difficulty of coating

Inactive Publication Date: 2022-07-01
JIANGSU HORIZON NEW ENERGY TECH CO LTD
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  • Summary
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Problems solved by technology

[0006] The technical problem to be solved by the present invention is to provide a simple preparation method that does not need to add wetting agents and other auxiliary materials for the current polyolefin organic separators with low surface free energy, poor hydrophilicity, and difficulty in coating polyolefin separators with water-based slurry. agent, greatly improving the surface free energy of the hydrophilic polyolefin separator

Method used

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  • Preparation method of hydrophilic polyolefin diaphragm for lithium ion battery
  • Preparation method of hydrophilic polyolefin diaphragm for lithium ion battery

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preparation example Construction

[0019] Raw material zirconium dioxide ZrO 2 Preparation of powder:

[0020] First, ZrOCl 2 in CaCl 2 Dissolved in water, the preparation concentration is 1mol / L and contains 5% CaCl 2 ZrOCl 2 Ammonia solution with a concentration of 28% is diluted with distilled water, wherein the volume ratio of ammonia water to distilled water is 1:3. The zirconia precursor was prepared by the cross-spray method, and then the precursor was washed several times until no Cl was detected. - , that is, the precursor of the hydrothermal reaction is obtained. 65mL of the hydrothermal reaction precursor solution with a concentration of 0.25mol / L was added to a 100mL reaction kettle, and then 5mL of sodium hydroxide mineralizer was added. After reacting at a temperature of 110°C for 2h, the product was separated and dried to obtain an average Zirconium dioxide ZrO with a particle size of 16 to 34 nm 2 powder.

Embodiment 1

[0023] Polyethylene and zirconium dioxide (ZrO 2 ) powder raw materials are evenly mixed, wherein ZrO 2 The mass of the powder accounts for 2.5% of the mass of the polyolefin, and a hydrophilic lithium-ion battery separator with a thickness of 16 μm is prepared by a wet method.

Embodiment 2

[0025] Polyethylene and zirconium dioxide (ZrO 2 ) powder raw materials are evenly mixed, wherein ZrO 2 The mass of the powder accounts for 1% of the mass of the polyolefin, and a hydrophilic lithium-ion battery separator with a thickness of 16 μm is prepared by a wet method.

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Abstract

The invention discloses a preparation method of a hydrophilic polyolefin diaphragm for a lithium ion battery, the preparation method is characterized in that polyolefin and zirconium dioxide (ZrO2) powder are taken as raw materials, the hydrophilic polyolefin diaphragm is prepared by adopting a wet method after the two raw materials are uniformly mixed, and the mass of the ZrO2 powder accounts for 1-6% of the mass of the polyolefin. The preparation method is simple in process and saves cost, the surface free energy of the obtained polyolefin diaphragm is greatly improved, the hydrophilicity is strong, the contact angle of water in the diaphragm is 65-88 degrees, the surface tension of the diaphragm can be improved to 45-50 mN / m, the coating difficulty of water-based slurry on the diaphragm is remarkably reduced, the addition of a wetting agent in the slurry can be directly omitted, and the production cost is reduced. And the diaphragm also maintains relatively good air permeability.

Description

technical field [0001] The invention relates to the field of preparation of lithium ion battery separators, in particular to a preparation method of a hydrophilic polyolefin separator for lithium ion batteries. Background technique [0002] Lithium-ion batteries have become the main power source for various electronic products and electric vehicles due to their advantages of high energy density, high operating voltage, long cycle life and low self-discharge. The separator is a key material for lithium-ion batteries. Among them, the liquid absorption and liquid retention capacity of the separator directly affects the capacity of the lithium-ion battery. [0003] At present, most diaphragms are polyolefin microporous diaphragms prepared by both dry and wet processes, such as polyethylene (PE) film, polypropylene (PP) film or composite diaphragm composed of polyethylene film and polypropylene film, etc. . However, due to the low surface energy, high cleanliness, smooth surfa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M50/403H01M50/446H01M50/489H01M10/0525B82Y30/00
CPCH01M50/403H01M50/446H01M50/489H01M10/0525B82Y30/00
Inventor 刘美林张立斌赵海玉沈亚定
Owner JIANGSU HORIZON NEW ENERGY TECH CO LTD
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