A lithium battery separator in a gel-like structure, a preparation method thereof and an all-solid-state lithium battery

A lithium battery and diaphragm technology, applied in the field of all-solid lithium batteries, can solve the problems of low electrical conductivity and low mechanical strength, and achieve the effects of simple production process, good cycle performance and good mechanical strength

Active Publication Date: 2019-04-05
DONGGUAN UNIV OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] Aiming at the problems of low electrical conductivity and low mechanical strength of traditional PEO-based solid electrolytes, the present invention boldly innovates from

Method used

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  • A lithium battery separator in a gel-like structure, a preparation method thereof and an all-solid-state lithium battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0109] Preparation of the three-dimensional channel layer: Take an appropriate amount of polyimide resin, slowly add it to N,N-dimethylformamide at room temperature, and treat it under mechanical stirring at 200 rpm for 6 hours to obtain a clear solution with a concentration of 12%. Resin solution; under 18kV electrostatic high voltage and 14cm receiving distance, use the above solution to carry out electrospinning with a 0.5mm needle to prepare a nanofiber film, and clamp the film with two 2mm thick glass plates, and dry it at 150 degrees Celsius for 6 hour, finally obtain a three-dimensional channel layer with a thickness of 25 microns, an average pore diameter of 22 microns, and a porosity of 84%.

[0110] Preparation of the surface skin layer: Take an appropriate amount of polyvinylidene fluoride, slowly add it to acetone, and treat it for 8 hours at 45 degrees Celsius under mechanical stirring at 150 rpm to obtain a clear solution with a concentration of 10%; Scratch a sk...

Embodiment 2

[0117] Preparation of the three-dimensional channel layer: Take an appropriate amount of polyphenylene ether resin, slowly add it to N-methylpyrrolidone at room temperature, and treat it under mechanical stirring at 300 rpm for 4 hours to obtain a clear resin solution with a concentration of 18%; Under high pressure and a receiving distance of 10cm, the nanofiber membrane was prepared by electrospinning using the above solution with a 0.9mm needle, and the membrane was clamped by two 2mm thick glass plates, and dried at 130 degrees Celsius for 6 hours, and finally the thickness was obtained. The 20-micron three-dimensional channel layer has an average pore diameter of 45 microns and a porosity of 90%.

[0118] Preparation of the surface skin layer: Take an appropriate amount of polyvinylidene fluoride, slowly add it to acetone, and treat it for 8 hours at 45 degrees Celsius under mechanical stirring at 150 rpm to obtain a clear solution with a concentration of 15%; Scratch a c...

Embodiment 3

[0125] Preparation of the three-dimensional channel layer: Take an appropriate amount of polyacrylonitrile resin, slowly add it to dimethyl sulfoxide at room temperature, and treat it under mechanical stirring at 300 rpm for 12 hours to obtain a clear resin solution with a concentration of 13%; at 22kV Under electrostatic high voltage and a receiving distance of 16cm, the nanofiber membrane was prepared by electrospinning using the above solution with a 1.2mm needle, and the membrane was clamped by two 2mm thick glass plates, and dried at 150 degrees Celsius for 4 hours, and finally the thickness was obtained. The three-dimensional channel layer is 15 microns, the average pore diameter is 26 microns, and the porosity reaches 87%.

[0126] Preparation of the surface skin layer: Take an appropriate amount of polyvinylidene fluoride, slowly add it to acetone, and treat it for 8 hours at 45 degrees Celsius under mechanical stirring at 150 rpm to obtain a clear solution with a conce...

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Abstract

The invention provides a lithium battery separator in a gel-like structure, a preparation method thereof and an all-solid-state lithium battery The lithium battery separator includes upper and lower surface layers, an intermediate three-dimensional channel layer and ion conductive functional materials filled in the surface layers and the three-dimensional channel layer, wherein the surface layer has a nano-scale channel structure, and the three-dimensional channel layer has a high porosity and a micron-sized pore structure. The ion conductive functional materials are a mixture of polymer resinand lithium salt. According to the invention, the electrolyte retention capacity of the separator can be improved on the basis of maintaining relatively high ion conductivity through combining the surface layers on the upper and lower surfaces of the high-porosity three-dimensional pore layer, thereby ensuring that the electrolyte does not flow significantly under severe mechanical motion and maintains a gel-like state. The invention is expected to be applied to an all-solid lithium ion battery, and the preparation method has low cost and a simple process, and is convenient for continuous production.

Description

technical field [0001] The invention belongs to the field of preparation of diaphragm materials for lithium ion batteries and lithium batteries, and in particular relates to a lithium battery diaphragm with a gel-like structure, a preparation method and an all-solid lithium battery. Background technique [0002] Since Sony took the lead in realizing the commercialization of lithium-ion batteries in 1991, lithium-ion batteries have gradually expanded from mobile phone batteries to other consumer electronics, and have continued to expand to electric bicycles, electric vehicles, large-scale energy storage, aerospace and other application fields, and their performance has continued to improve. promote. However, for lithium-ion batteries using liquid electrolytes with higher and higher energy densities, although various improvement measures have been taken from various levels such as materials, electrodes, batteries, modules, power management, thermal management, and system desig...

Claims

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Application Information

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IPC IPC(8): H01M2/16H01M2/14H01M10/0525H01M10/0565D04H1/728H01M50/403H01M50/423H01M50/426H01M50/451H01M50/457H01M50/497
CPCH01M10/0525H01M10/0565D04H1/728H01M50/403H01M50/411Y02E60/10
Inventor 彭辉肖伟
Owner DONGGUAN UNIV OF TECH
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