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Lithium sulphur battery taking graphene coated carbon nanofiber/sulphur composite material as anode material

A carbon nanofiber, graphene coating technology, applied in lithium batteries, battery electrodes, non-aqueous electrolyte batteries, etc., can solve the problems of increasing contact resistance, reducing battery rate performance, etc. Simple to use effects

Inactive Publication Date: 2018-07-13
HUNAN GUOSHENG GRAPHITE TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the sulfur distributed on the surface of carbon nanofibers increases the contact resistance of the carbon nanofiber / sulfur composite surface on the one hand, resulting in a decrease in the battery rate performance; on the other hand, it is difficult to completely inhibit the sulfur Loss of active substances and reduction products produced during sulfur discharge

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] This embodiment provides a lithium-sulfur battery using graphene-coated carbon nanofiber / sulfur composite material as the positive electrode material, and the specific steps are as follows:

[0031] S1. Mix carbon nanofibers and starch uniformly at a ratio of 1:4, then add them into deionized water, and perform ultrasonic dispersion for 1 hour to obtain a uniformly mixed solution. The viscosity of the mixed solution is suitable for electrospinning;

[0032] S2. Prepare carbon microspheres from the mixed solution obtained in step S1 using electrospinning technology, wherein the specific steps of the electrospinning technology are: first put the mixed solution into a syringe, the inner diameter of the nozzle of the syringe is 3mm, and fix the syringe On the support, the nozzle is aimed at the circular receiving plate, the distance between the nozzle and the circular receiving plate is 15cm, and the circular receiving plate rotates at a speed of 15r / min, and the spinning is...

Embodiment 2

[0037] This embodiment provides a lithium-sulfur battery using graphene-coated carbon nanofiber / sulfur composite material as the positive electrode material, and the specific steps are as follows:

[0038] S1. Mix carbon nanofibers and starch uniformly at a ratio of 1:5, then add them into deionized water, and perform ultrasonic dispersion for 3 hours to obtain a uniform mixed solution. The viscosity of the mixed solution is suitable for electrospinning;

[0039] S2. Using the electrospinning technology to prepare the mixed solution obtained in step S1 to obtain carbon microspheres, wherein the specific steps of the electrospinning technology are: first put the mixed solution into a syringe, and the inner diameter of the nozzle of the syringe is 4 mm, and fix the syringe On the support, the nozzle is aimed at the circular receiving plate, the distance between the nozzle and the circular receiving plate is 20cm, and the circular receiving plate rotates at a speed of 20r / min, and...

Embodiment 3

[0044] This embodiment provides a lithium-sulfur battery using graphene-coated carbon nanofiber / sulfur composite material as the positive electrode material, and the specific steps are as follows:

[0045] S1. Mix carbon nanofibers and starch evenly at a ratio of 1:4.5, then add them into deionized water, and perform ultrasonic dispersion for 2.5 hours to obtain a uniform mixed solution. The viscosity of the mixed solution is suitable for electrospinning;

[0046] S2. Using the electrospinning technology to prepare the mixed solution obtained in step S1 to obtain carbon microspheres, wherein the specific steps of the electrospinning technology are: first put the mixed solution into a syringe, and the inner diameter of the nozzle of the syringe is 4 mm, and fix the syringe On the support, the nozzle is aimed at the circular receiving plate, the distance between the nozzle and the circular receiving plate is 20cm, and the circular receiving plate is rotated at a speed of 15r / min,...

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PUM

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Abstract

The invention discloses a lithium sulphur battery taking a graphene coated carbon nanofiber / sulphur composite material as an anode material. Carbon nanofiber / sulphur composite microparticle material,acetylene black and PVDF are uniformly mixed in NMP according to a mass ratio of 80:10:10 and an aluminum foil is coated with the mixture, so as to form an anode piece, and a metallic lithium piece taken as a cathode is assembled into a button battery in a glove box; electrolyte adopts 1 M LiTFSI / DOL-DME; the volume ratio is 1:1; a membrane adopts a celgard 2400 microporous membrane. The lithium sulphur battery has high first specific discharge capacity, and is good in capacity retention ratio, the preparation method is simple and practical, the cost is low, and the battery is green and environmentally friendly, and has an excellent application prospect.

Description

technical field [0001] The invention belongs to the technical field of electrode materials, and more specifically relates to a lithium-sulfur battery using graphene-coated carbon nanofiber / sulfur composite material as a positive electrode material. Background technique [0002] With the increasing demand for energy consumption in the world, the oil resources that can be developed and utilized are increasingly depleted, while the environmental pollution is becoming more and more serious. Therefore, the use of electrochemical energy storage technology to store and reuse clean solar energy and wind energy is undoubtedly the solution to this problem in the 21st century. In addition, mobile electronic devices and electric vehicles that affect people's lives also put forward higher requirements for future electrochemical energy storage technology. All of these require safe, low-cost, high-energy-density and long-life secondary batteries to be realized. Among many energy storage m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/052
CPCH01M4/366H01M4/38H01M4/625H01M4/628H01M10/052H01M2004/021H01M2004/027Y02E60/10
Inventor 林前锋
Owner HUNAN GUOSHENG GRAPHITE TECH CO LTD
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