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High-strength solid electrolyte membrane and preparation method and application thereof

A technology of solid electrolyte membrane and electrolyte membrane, which is applied in the direction of circuits, electrical components, secondary batteries, etc., can solve the problems of low strength of the electrolyte diaphragm, and achieve the effects of reducing the risk of internal short circuit, improving strength, and not being easily damaged

Pending Publication Date: 2022-07-08
DONGFENG MOTOR GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The object of the present invention is to provide a high-strength solid electrolyte membrane and its preparation method and application, to solve the problem of low strength of the current electrolyte membrane

Method used

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  • High-strength solid electrolyte membrane and preparation method and application thereof
  • High-strength solid electrolyte membrane and preparation method and application thereof

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preparation example Construction

[0052] According to another typical embodiment of the present invention, there is provided a method for preparing a high-strength solid-state electrolyte membrane as described above, the method comprising:

[0053]S1. Mix the polymer matrix, the inorganic ceramic powder, the lithium salt and the solvent to obtain a slurry;

[0054] In some embodiments, the polymer matrix, the inorganic ceramic powder, the lithium salt and the solvent are mixed to obtain a slurry, which specifically includes:

[0055] S1.1. Mix the polymer matrix and the solvent to obtain a solution;

[0056] S1.2. Mix the lithium salt and the solution to obtain an intermediate slurry;

[0057] S1.3. Mix the inorganic ceramic powder and the intermediate slurry to obtain a slurry.

[0058] In some embodiments, the interval time of the interval ultrasonic treatment is 50min-70min, the ultrasonic interval time includes but not limited to 50min, 55min, 60min, 65min, 70min, and the single treatment time of the int...

Embodiment 1

[0080] A preparation method of a solid electrolyte membrane, the method comprising:

[0081] Weigh 0.57g of PCL into 10ml of dimethyl carbonate solvent, heat and stir, add 0.144g of LiPF6 lithium salt after it is completely dissolved, continue to heat and stir for 1-2 hours, then add Al2O3 powder, add inorganic ceramic powder and stir for 8h, And every hour ultrasound 30min. The uniformly dispersed slurry is evenly scraped onto the PET film to prepare 2 identical coated PET films. After coating, a non-woven film is immediately placed on one PET film, and another PET film is covered to form The symmetrical structure of PET film-composite solid electrolyte-non-woven fabric-composite solid electrolyte film-PET film, and then put it in a drying oven, dried at 30°C for 12 hours, after drying, tear off the PET film, put it in a vacuum drying oven, After drying at 30 °C for 12 h, a composite solid electrolyte membrane was obtained.

Embodiment 2

[0083] A preparation method of a solid electrolyte membrane, the method comprising:

[0084] Weigh 0.57g of PCL into 10ml of dimethyl carbonate solvent, heat and stir, add 0.144g of LiPF6 lithium salt after it is completely dissolved, continue to heat and stir for 1-2 hours, then add Al2O3 powder, add inorganic ceramic powder and stir for 8h, And every hour ultrasound 30min. Scratch the evenly dispersed slurry onto the PET film to prepare 2 copies of the same coated PET film. After coating, immediately place a PE separator (porosity 40%) on one PET film and cover with another PET film to form a symmetrical structure of PET film-composite solid electrolyte-PE-composite solid electrolyte film-PET film, then put it in a drying oven, dry at 30°C for 12h, after drying, tear off the PET film and put it in a vacuum drying oven and drying at 30 °C for 12 h to obtain a composite solid electrolyte membrane.

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Abstract

The invention particularly relates to a high-strength solid electrolyte membrane and a preparation method and application thereof, and belongs to the technical field of lithium ion batteries, the electrolyte membrane comprises a supporting layer and an electrolyte layer, the supporting layer is used for enhancing the mechanical strength of the electrolyte membrane, the electrolyte layer is coated on the surface of the supporting layer, and the electrolyte layer is coated on the surface of the supporting layer. By adding the supporting layer, the strength of the composite solid electrolyte is remarkably improved, and the composite solid electrolyte is not easy to puncture, is favorable for reducing the risk of internal short circuit and is not easy to damage in the assembly process.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and particularly relates to a high-strength solid-state electrolyte membrane and a preparation method and application thereof. Background technique [0002] Lithium-ion batteries are widely used due to their high specific energy, high operating voltage, long cycle life, low self-discharge rate, no memory effect, fast charge and discharge, and environmental friendliness. However, liquid lithium-ion batteries contain a large amount of organic electrolytes, which are volatile, flammable, and explosive. Safety accidents such as fires and explosions frequently occur in 3C, power batteries and other fields, which will become the largest liquid lithium battery on the development road in the future. obstacle. The solid-state battery uses a non-flammable solid-state electrolyte to replace the flammable organic liquid electrolyte, which greatly improves the safety of the battery system. At t...

Claims

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Application Information

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IPC IPC(8): H01M10/056H01M10/0525H01M10/42
CPCH01M10/056H01M10/0525H01M10/4235H01M2300/0085Y02P70/50
Inventor 龚钰刘敏王彦胡远森徐强
Owner DONGFENG MOTOR GRP
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