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Copper oxide/carbon nanofiber/sulfur electrode material and preparation and application thereof

A technology of carbon nanofibers and copper oxides, applied in nanocarbons, battery electrodes, circuits, etc., can solve problems such as high cost, poor performance, and complicated preparation process, and achieve low cost, improve cycle performance and capacity, and improve cycle Performance and Stability Effects

Inactive Publication Date: 2019-06-14
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a copper oxide / carbon nanofiber / sulfur electrode material and its preparation and application, which overcomes the defects of high cost, complicated preparation process and poor performance of the existing lithium-sulfur battery positive electrode material, and improves Coulombic efficiency, rate performance, cycle life and other key properties of lithium-sulfur batteries

Method used

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  • Copper oxide/carbon nanofiber/sulfur electrode material and preparation and application thereof
  • Copper oxide/carbon nanofiber/sulfur electrode material and preparation and application thereof
  • Copper oxide/carbon nanofiber/sulfur electrode material and preparation and application thereof

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Effect test

Embodiment 1

[0038] (1) Dissolve 0.1g of anhydrous copper acetate powder in 9.0g of N,N-dimethylformamide solution, stir magnetically at room temperature for 1h to obtain a uniform and stable solution, then add 1.0g of polyacrylonitrile powder, and stir magnetically for 10h And ultrasonic treatment 2h, obtain electrospinning stock solution; Carry out electrospinning (environmental humidity is 30%, and ambient temperature is 25 ℃, and spinning solution propulsion speed is 10.mL / h, and the distance between needle and receiving aluminum foil is 15cm , the voltage between the needle and the receiving aluminum foil is 18kV) to obtain a copper acetate / polyacrylonitrile nanofiber membrane, which is placed in a vacuum oven at 60°C for 24h.

[0039] (2) heat-treat the copper acetate / polyacrylonitrile nanofiber membrane obtained by electrospinning in a muffle furnace at a temperature of 280°C and a heat-treatment time of 4 hours; The temperature is 600° C., and the heat treatment time is 1 h to obta...

Embodiment 2

[0047] (1) Dissolve 0.3g of anhydrous copper acetate powder in 9.0g of N,N-dimethylformamide solution, stir magnetically at room temperature for 1h to obtain a uniform and stable solution, then add 1.0g of polyacrylonitrile powder, and stir magnetically for 10h And ultrasonic treatment 2h, obtain electrospinning stock solution; Carry out electrospinning (environmental humidity is 30%, and ambient temperature is 25 ℃, and spinning solution propulsion speed is 10.mL / h, and the distance between needle and receiving aluminum foil is 15cm , the voltage between the needle and the receiving aluminum foil is 18kV) to obtain a copper acetate / polyacrylonitrile nanofiber membrane, which is placed in a vacuum oven at 60°C for 24h.

[0048] (2) heat-treat the copper acetate / polyacrylonitrile nanofiber membrane obtained by electrospinning in a muffle furnace at a temperature of 280°C and a heat-treatment time of 4 hours; The temperature is 600° C., and the heat treatment time is 1 h to obta...

Embodiment 3

[0054] (1) Dissolve 0.1g of anhydrous copper acetate powder in 9.0g of N,N-dimethylformamide solution, stir magnetically at room temperature for 1h to obtain a uniform and stable solution, then add 1.0g of polyacrylonitrile powder, and stir magnetically for 10h And ultrasonic treatment 2h, obtain electrospinning stock solution; Carry out electrospinning (environmental humidity is 30%, and ambient temperature is 25 ℃, and spinning solution propulsion speed is 10.mL / h, and the distance between needle and receiving aluminum foil is 15cm , the voltage between the needle and the receiving aluminum foil is 18kV) to obtain a copper acetate / polyacrylonitrile nanofiber membrane, which is placed in a vacuum oven at 60°C for 24h.

[0055] (2) heat-treat the copper acetate / polyacrylonitrile nanofiber membrane obtained by electrospinning in a muffle furnace at a temperature of 280°C and a heat-treatment time of 4 hours; The temperature is 700° C., and the heat treatment time is 1 h to obta...

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Abstract

The invention relates to a copper oxide / carbon nanofiber / sulfur electrode material, and a preparation and an application thereof. The copper oxide / carbon nanofiber / sulfur electrode material is prepared by the following steps: adding polyacrylonitrile into an N,N-dimethylformamide solution of anhydrous copper acetate to obtain an electrostatic spinning solution, and performing electrostatic spinning to obtain a copper acetate / polyacrylonitrile nanofiber membrane; performing heat treatment to obtain a copper oxide / carbon nanofiber composite; and mixing the copper oxide / carbon nanofiber compositewith sublimed sulfur, and performing heat treatment. The copper oxide / carbon nanofiber obtained by the invention functions to adsorb polysulfide, and can improve the cycle performance and the stability of a lithium sulfur battery. The copper oxide / carbon nanofiber / sulfur electrode material provided by the invention has a broad application prospect in the field of electrode materials of the lithium sulfur battery.

Description

technical field [0001] The invention belongs to the technical field of lithium-sulfur battery electrode materials, and in particular relates to a copper oxide / carbon nanofiber / sulfur electrode material and its preparation and application. Background technique [0002] With the emergence of global energy demand and consumption and environmental pollution caused by the depletion of fossil fuels, human beings urgently need to develop green and clean energy to get rid of excessive dependence on fossil fuels such as oil and natural gas. In addition, the development of mobile devices and energy-intensive electric vehicles has also increased the demand for high-performance batteries. Traditional secondary batteries such as lead-acid batteries and lithium-ion batteries are still the mainstream of the market, but they are not yet able to fully meet the growing demand for high-performance energy systems from portable power stations to grid energy storage stations. [0003] Lithium-su...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/48H01M4/583H01M4/62H01M4/38H01M10/052C01B32/15
CPCY02E60/10
Inventor 李耀刚王宝俊王宏志侯成义张青红
Owner DONGHUA UNIV
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