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Self-supporting iron trifluoride-carbon nanofiber positive electrode material and preparation method thereof

A technology of carbon nanofibers and ferric trifluoride, applied in battery electrodes, circuits, electrical components, etc., can solve problems such as poor conductivity and volume expansion, and achieve the effects of improving poor conductivity, increasing the proportion, and alleviating volume expansion

Active Publication Date: 2022-05-06
XIAN UNIV OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide self-supporting ferric trifluoride-carbon nanofiber cathode material, which solves the problems of poor electrical conductivity and serious volume expansion of ferric trifluoride in the prior art

Method used

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  • Self-supporting iron trifluoride-carbon nanofiber positive electrode material and preparation method thereof
  • Self-supporting iron trifluoride-carbon nanofiber positive electrode material and preparation method thereof
  • Self-supporting iron trifluoride-carbon nanofiber positive electrode material and preparation method thereof

Examples

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Effect test

Embodiment 1

[0033] Step 1: Weigh polyacrylonitrile and acetyl iron acetate according to the mass ratio of 2:1, dissolve them in 20ml of N,N-dimethylformamide; stir thoroughly for 16 hours, and then let stand for 1 hour after no obvious agglomeration and precipitation;

[0034] Step 2, put the precursor solution in step 1 into a 10ml syringe, and drain the air bubbles. The conditions of the electrospinning process are: negative pressure 3kV; positive pressure 16kV; glue pushing speed 0.6ml / h; distance between the needle and the receiver 18cm; ambient temperature controlled at about 30°C; ambient humidity controlled at about 28%;

[0035] Step 3, spread the composite fiber membrane obtained in step 2 in a blast drying oven, heat to 260°C at a heating rate of 5°C / min and keep it for 2 hours, then cool down naturally; then place the pre-oxidized membrane in a tubular In the furnace, under a nitrogen atmosphere, heat up to 800°C at a heating rate of 5°C / min and keep it for 2 hours, then cool d...

Embodiment 2

[0039] Step 1, weigh polyacrylonitrile and acetyl iron acetate according to the mass ratio of 1:2, dissolve in 20ml of N,N-dimethylformamide; stir thoroughly for 18 hours, and then let stand for 1 hour after no obvious agglomeration and precipitation;

[0040] Step 2, put the precursor solution in step 1 into a 10ml syringe, and drain the air bubbles. The conditions of the electrospinning process are: negative pressure 3kV; positive pressure 16kV; glue pushing speed 0.6ml / h; distance between the needle and the receiver 18cm; ambient temperature controlled at about 30°C; ambient humidity controlled at about 28%;

[0041] Step 3, spread the composite fiber membrane obtained in step 2 in a blast drying oven, heat to 260°C at a heating rate of 5°C / min and keep it for 2 hours, then cool down naturally; then place the pre-oxidized membrane in a tubular In the furnace, under a nitrogen atmosphere, heat up to 800°C at a heating rate of 5°C / min and keep it for 2 hours, then cool down t...

Embodiment 3

[0045] Step 1, weigh polyvinylpyrrolidone and ferric nitrate according to the mass ratio of 1:2, dissolve in 20ml of N,N-dimethylformamide; stir thoroughly for 12 hours, and then let stand for 1 hour after no obvious agglomeration and precipitation;

[0046] Step 2, put the precursor solution in step 1 into a 10ml syringe, and drain the air bubbles. The conditions of the electrospinning process are: negative pressure 3kV; positive pressure 16kV; glue pushing speed 0.6ml / h; distance between the needle and the receiver 18cm. The ambient temperature is controlled at about 30°C; the ambient humidity is controlled at about 28%;

[0047] Step 3, spread the composite fiber membrane obtained in step 2 in a blast drying oven, heat to 260°C at a heating rate of 5°C / min and keep it for 2 hours, then cool down naturally; then place the pre-oxidized membrane in a tubular In the furnace, under a nitrogen atmosphere, heat up to 800°C at a heating rate of 5°C / min and keep it for 2 hours, the...

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Abstract

The invention discloses a self-supporting iron trifluoride-carbon nanofiber positive electrode material, which comprises iron trifluoride nanoparticles and carbon nanofibers, the carbon nanofibers are a skeleton, and the iron trifluoride nanoparticles are uniformly distributed on the surface and inside of the carbon nanofibers; the invention also discloses a preparation method of the self-supporting iron trifluoride-carbon nanofiber positive electrode material, and the preparation method comprises the following steps: obtaining an iron-containing composite nanofiber membrane through an electrostatic spinning technology, and then carrying out pre-oxidation, high-temperature carbonization and fluorination treatment to obtain the self-supporting iron trifluoride-carbon nanofiber; the construction of the composite material structure effectively improves the problems of poor conductivity, volume expansion and the like of iron trifluoride, and the thought is expected to be applied to other electrode materials with poor conductivity.

Description

technical field [0001] The invention belongs to the technical field of energy storage material design and relates to a self-supporting ferric trifluoride-carbon nanofiber cathode material. [0002] The invention also relates to a preparation method of the self-supporting ferric trifluoride-carbon nanofiber cathode material. Background technique [0003] As a new energy storage device at the forefront of scientific research, lithium-ion batteries have been widely used in transportation, communications, aerospace, military and other aspects. However, in the production process of traditional commercial lithium-ion batteries, the cost of batteries is relatively high due to the extensive use of metal cobalt in positive electrode materials. In addition, the biggest problem facing traditional lithium-ion battery cathode materials is the low theoretical capacity. For example, traditional cathode materials such as lithium cobaltate, lithium manganese oxide, ternary materials, and li...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/58H01M4/583H01M4/62
CPCH01M4/364H01M4/58H01M4/5835H01M4/625Y02E60/10
Inventor 李喜飞姜钦婷刘兴江李军王松蕊王晶晶李文斌
Owner XIAN UNIV OF TECH
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