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Lithium-sulfur batteries using graphene-coated carbon/sulfur composites as cathode materials

A technology of graphene coating and composite materials, applied in the direction of lithium batteries, positive electrodes, battery electrodes, etc., can solve the problems of reduced battery rate performance, increased contact resistance, etc., to improve electrical conductivity, inhibit dissolution, and improve electrochemical performance. performance effect

Inactive Publication Date: 2020-10-09
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 a graphene-coated carbon / 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. Put the mixed solution into a three-necked flask, fix it on an ultrasonic spray device, and raise the temperature of the electromagnetic tube furnace to 550°C at a heating rate of 10°C / min under the protection of argon, and use the ultrasonic wave to dissolve the mixed solution. The solution is atomized and passed through a quartz tube in an electromagnetic tube furnace for spheroidization. After 12 hours, after the solution was completely sprayed, the tube furnace was allowed to cool naturally, and the spheroidized mate...

Embodiment 2

[0037] This embodiment provides a lithium-sulfur battery using a graphene-coated carbon / 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. Put the mixed solution into a three-necked flask, fix it on an ultrasonic spray device, and raise the temperature of the electromagnetic tube furnace to 580°C at a heating rate of 10°C / min under the protection of argon, and use the action of ultrasonic waves to dissolve the mixed solution. The solution is atomized and passed through a quartz tube in an electromagnetic tube furnace for spheroidization. After 16 hours, after the solution was completely sprayed, the tube furnace was allowed to cool naturally, and the spheroi...

Embodiment 3

[0044]This embodiment provides a lithium-sulfur battery using a graphene-coated carbon / 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. Put the mixed solution into a three-necked flask, fix it on an ultrasonic spray device, and raise the temperature of the electromagnetic tube furnace to 600°C at a heating rate of 10°C / min under the protection of argon, and use the ultrasonic wave to dissolve the mixed solution. The solution is atomized and passed through a quartz tube in an electromagnetic tube furnace for spheroidization. After 18 hours, after the solution was completely sprayed, the tube furnace was allowed to cool naturally, and the spheroidized mater...

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Abstract

The invention discloses a lithium-sulfur battery using a graphene coated carbon / sulfur composite material as a positive electrode material. The preparation method comprises the following steps: uniformly mixing a carbon / sulfur composite microsphere material, acetylene black and PVDF (Polyvinylidene Fluoride) in NMP (N-Methyl Pyrrolidone) according to a mass ratio of 80:10:10, coating the mixture onto an aluminum foil to prepare a positive pole piece; taking a metal lithium wafer as a negative electrode, and assembling into a button battery in a glove box, wherein the electrolyte is 1 MLiTFSI / DOL-DME, the volume ratio is 1:1, and the diaphragm is a celgard 2400 microporous membrane. The lithium-sulfur battery disclosed by the invention has high first discharging specific capacity, and the capacity retention ratio is excellent. Moreover, the preparation method is simple, feasible, low in cost, green and environmental-friendly, and has excellent application prospects.

Description

technical field [0001] The invention belongs to the technical field of electrode materials, and more specifically relates to a lithium-sulfur battery using a graphene-coated carbon / 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 methods, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/052
CPCH01M4/366H01M4/38H01M4/625H01M4/628H01M10/052H01M2004/021H01M2004/028Y02E60/10
Inventor 林前锋
Owner HUNAN GUOSHENG GRAPHITE TECH CO LTD
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