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Preparation method of zinc selenide/carbon fiber energy storage material and application thereof

A technology of energy storage materials and carbon fibers, applied in electrochemical generators, electrical components, battery electrodes, etc., can solve problems such as poor cycle stability and poor rate performance, achieve low production costs, increase transfer rates, and have good application prospects Effect

Inactive Publication Date: 2019-05-14
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The invention provides a preparation method and application of a zinc selenide / carbon fiber energy storage material, aiming to solve technical problems such as poor cycle stability and poor rate performance when zinc selenide is used as an energy storage material in the prior art to a certain extent

Method used

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  • Preparation method of zinc selenide/carbon fiber energy storage material and application thereof
  • Preparation method of zinc selenide/carbon fiber energy storage material and application thereof
  • Preparation method of zinc selenide/carbon fiber energy storage material and application thereof

Examples

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Embodiment 1

[0024] A kind of preparation method of zinc / selenium oxide energy storage material, it comprises the steps:

[0025] Dissolve zinc oxalate and polyacrylonitrile in N,N-dimethylformamide. The concentration of zinc oxalate in the solution is 0.4mol / L, and the total mass ratio of polyacrylonitrile to the solution is 0.08:1. The dissolution condition was stirring in a water bath at 60°C for 30 minutes. Precursor fibers were prepared by electrospinning with a voltage of 13kV and a distance of 20cm between the nozzle and the receiver. Then, the mass ratio of the precursor fiber and selenium powder is 3:1, and the temperature is raised to 650°C under vacuum at a heating rate of 10°C / min, and maintained at 650°C, and the calcination time is 120min. After cooling, it is ground and sieved The energy storage material is obtained.

Embodiment 2

[0027] Dissolve zinc oxalate and polyacrylonitrile in N,N-dimethylformamide. The concentration of zinc oxalate in the solution is 0.3mol / L, and the total mass ratio of polyacrylonitrile to the solution is 0.1:1. The dissolution condition was stirring in a water bath at 60°C for 30 minutes. Precursor fibers were prepared by electrospinning with a voltage of 13kV and a distance of 20cm between the nozzle and the receiver. Then, the mass ratio of the precursor fiber and selenium powder is 3:1, and the temperature is raised to 650°C under vacuum at a heating rate of 10°C / min, and maintained at 650°C, and the calcination time is 90min. After cooling, it is ground and sieved The energy storage material is obtained.

Embodiment 3

[0029] Dissolve zinc oxalate and polyacrylonitrile in N,N-dimethylformamide. The concentration of zinc oxalate in the solution is 0.4mol / L, and the total mass ratio of polyacrylonitrile to the solution is 0.08:1. The dissolution condition was stirring in a water bath at 60°C for 30 minutes. Precursor fibers were prepared by electrospinning with a voltage of 15kV and a distance of 15cm between the nozzle and the receiver. Then, the mass ratio of the precursor fiber and selenium powder is 3:1, and the temperature is raised to 650°C under vacuum at a heating rate of 10°C / min, and maintained at 650°C, and the calcination time is 120min. After cooling, it is ground and sieved The energy storage material is obtained.

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Abstract

The invention relates to a preparation method and an application of a zinc selenide / carbon fiber energy storage material. The preparation method comprises the steps of dissolving zinc oxalate and polyacrylonitrile in N,N-dimethylformamide to prepare a precursor fiber through an electrospinning method; then, heating the precursor fiber and the selenium powder in a mass ratio of 1-4:1 at a temperature rise ratio of 5-15 degrees centigrade / min to 500-1000 degrees centigrade under vacuum, maintaining the mixture at the temperature of 500-1000 degrees centigrade, and calcinating the mixture for 30-180min; and cooling the calcinated mixture, and milling and sifting the cooled mixture to obtain the zinc selenide / carbon fiber energy storage material. The product produced by the invention is a fibrous composite material having a diameter of about 200 nm. The product still has a specific discharge capacity of 701.7 mAh / g after 600 charge and discharge cycles at a current density of 2 A / g and hasa good application prospect in the anode material of a lithium ion battery.

Description

technical field [0001] The invention belongs to the field of new materials, and in particular relates to a preparation method and application of a zinc selenide / carbon fiber energy storage material. Background technique [0002] At present, the mass specific capacity of graphite-based lithium-ion battery anode materials in commercial application is low, and dendrite lithium is easy to be generated during high-current charging and discharging, which causes safety problems. High and cheap lithium-ion battery anode materials. Zinc selenide has the advantages of high theoretical mass specific capacity, small voltage hysteresis effect, environmental friendliness and low discharge platform, and is expected to replace graphite as a new negative electrode material for lithium-ion batteries. However, due to its low electronic conductivity and lithium ion diffusion rate, and the large volume change during charging and discharging, resulting in the pulverization of electrode materials...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/58H01M4/583H01M10/0525
CPCY02E60/10
Inventor 张明瑜周鹏黄启忠苏硩安
Owner CENT SOUTH UNIV
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