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Preparation method and application of a carbon fiber-coated solid electrolyte material

A solid electrolyte and carbon fiber technology, applied in solid electrolytes, non-aqueous electrolytes, non-aqueous electrolyte batteries, etc., can solve the problems of high interface resistance and poor contact at the positive interface, and achieve the advantages of reducing contact resistance, tight contact, and increasing contact area. Effect

Active Publication Date: 2022-04-01
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention aims at the problems of poor positive interface contact and high interface resistance of existing solid-state batteries, and provides a preparation method and application of a carbon fiber-coated solid electrolyte material

Method used

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  • Preparation method and application of a carbon fiber-coated solid electrolyte material
  • Preparation method and application of a carbon fiber-coated solid electrolyte material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] In this example, the carbon fiber-coated solid electrolyte material was prepared according to the following steps:

[0021] (1) Prepare electrospinning solution: weigh 2g of polyacrylonitrile powder (PAN) and dissolve it in 50mL of dimethylformamide (DMF), stir magnetically at 80°C for 6h until the solution becomes transparent, viscous and uniform .

[0022] (2) Transfer 20mL of the above-mentioned spinning solution into a 20mL syringe equipped with a No. 12 stainless steel needle, and then place it on the injector frame of the electrospinning equipment, use aluminum foil as the receiving plate, and place the garnet-type solid electrolyte sheet Fix it on the aluminum foil, set the distance between the needle head and the receiving plate to 10cm, place the positive high voltage on the needle head, and the negative high voltage on the receiving plate, set the positive high voltage to 10kV, and the negative high voltage to 1kV, start electrospinning, and advance the speed ...

Embodiment 2

[0028] In this example, the carbon fiber-coated solid electrolyte material was prepared according to the following steps:

[0029] (1) Prepare electrospinning solution: Weigh 3g of polyacrylonitrile powder (PAN) and dissolve it in 50mL of dimethylformamide (DMF), stir magnetically at 80°C for 6 hours until the solution becomes transparent, viscous and homogeneous .

[0030] (2) Transfer 20mL of the above-mentioned spinning solution into a 20mL syringe equipped with a No. 12 stainless steel needle, and then place it on the injector frame of the electrospinning equipment, use aluminum foil as the receiving plate, and place the garnet-type solid electrolyte sheet Fix it on the aluminum foil, set the distance between the needle head and the receiving plate to 10cm, place the positive high voltage on the needle head, and the negative high voltage on the receiving plate, set the positive high voltage to 10kV, and the negative high voltage to 1kV, start electrospinning, and advance t...

Embodiment 3

[0034] In this example, the carbon fiber-coated solid electrolyte material was prepared according to the following steps:

[0035] (1) Prepare electrospinning solution: weigh 2g of polyacrylonitrile powder (PAN) and dissolve it in 50mL of dimethylformamide (DMF), stir magnetically at 80°C for 6h until the solution becomes transparent, viscous and uniform .

[0036] (2) Transfer 20mL of the above-mentioned spinning solution into a 20mL syringe equipped with a No. 12 stainless steel needle, and then place it on the injector frame of the electrospinning equipment, use aluminum foil as the receiving plate, and place the garnet-type solid electrolyte sheet Fix it on the aluminum foil, set the distance between the needle head and the receiving plate to 10cm, place the positive high voltage on the needle head, and the negative high voltage on the receiving plate, set the positive high voltage to 10kV, and the negative high voltage to 1kV, start electrospinning, and advance the speed ...

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Abstract

The invention discloses a method for preparing a carbon fiber-coated solid electrolyte material and its application. The method includes the following steps: Step 1. Weigh polyacrylonitrile powder and dissolve it in dimethylformamide, and stir it magnetically until the solution becomes It is a transparent, viscous and uniform solution; step 2, transfer the electrospinning solution into a syringe for electrospinning; step 3, remove the electrospun solid electrolyte sheet, dry it and calcinate it in a tube furnace, Carrying out pre-oxidation; step 4, carbonizing the pre-oxidized material in an argon atmosphere to obtain a carbon fiber-coated solid electrolyte material. The invention utilizes electrospun carbon material to coat the surface of the solid electrolyte, and the coating layer is in close contact with the solid electrolyte, which can inhibit element diffusion and side reactions between the cathode and the cathode, and at the same time significantly improve the interaction between the cathode material and the electrolyte. Contact area, reduce interface contact resistance, reduce polarization, improve discharge performance.

Description

technical field [0001] The invention belongs to the technical field of all-solid-state lithium batteries, and relates to a method for modifying the positive electrode interface of an all-solid-state lithium battery and its application, in particular to a method for preparing a carbon fiber-coated solid electrolyte material and its application. Background technique [0002] Since the beginning of the 21st century, due to the increasingly prominent problems of energy crisis, environmental pollution, and greenhouse effect brought about by traditional energy utilization methods, improving energy structure, developing clean, efficient and sustainable new energy and building a low-carbon society has become a top priority. As a new type of high-efficiency green battery, lithium-ion batteries have attracted much attention. Lithium-ion batteries are favored by people because of their superior performance such as safety, environmental protection, no memory effect, high specific energy ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0562H01M10/052H01M10/0525
CPCH01M10/0562H01M10/052H01M10/0525H01M2300/0068Y02E60/10
Inventor 张乃庆孙逊范立双
Owner HARBIN INST OF TECH