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Sulfur-carbon composite material coated with proton exchange membrane, its preparation method and application

A sulfur-carbon composite material, proton exchange membrane technology, applied in the field of electrochemistry, can solve the problems of reducing battery cycle stability and Coulomb efficiency, and achieve the effect of inhibiting the shuttle effect and preventing dissolution and diffusion

Active Publication Date: 2017-02-08
SHANDONG YUHUANG NEW ENERGY TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to make up for the above deficiencies and solve the problem that the shuttle effect of the soluble polysulfides generated during the discharge process of the positive electrode material of the lithium-sulfur battery between the positive and negative electrodes of the battery reduces the cycle stability and coulombic efficiency of the battery, the present invention provides a proton exchange membrane Coated sulfur-carbon composite material, and also provides the preparation method of the material and the application of the material as the positive electrode material of lithium-sulfur battery

Method used

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  • Sulfur-carbon composite material coated with proton exchange membrane, its preparation method and application
  • Sulfur-carbon composite material coated with proton exchange membrane, its preparation method and application
  • Sulfur-carbon composite material coated with proton exchange membrane, its preparation method and application

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Embodiment 1

[0027] The preparation method of the sulfur-carbon composite material coated with proton exchange membrane comprises the following steps:

[0028] 1) Put sublimated sulfur and carbon black (super-P conductive carbon black) into the ball mill tank at a mass ratio of 7:3, the ball milling medium is raw material, ethanol and ball stone, and the mass ratio of raw material, ethanol and ball stone is 1:5 : 5, take out after ball milling 9h at the rotating speed of 300r / min, make carbon black mixed material after drying; Carbon black mixed material is put into the tubular heating furnace that is full of nitrogen, is warming up to with the speed of 5 ℃ / min 150°C, and kept at 150°C for 9 hours, then increased the temperature to 300°C at the same heating rate, continued to hold at 300°C for 2 hours, and cooled to room temperature to obtain a sulfur-carbon composite material.

[0029] 2) Take 20 mg of nafion film solution with a mass fraction of 5% purchased from DuPont in the United Sta...

Embodiment 2

[0033] The preparation method of the sulfur-carbon composite material coated with proton exchange membrane comprises the following steps:

[0034] 1) Put sublimated sulfur and carbon black (super-P conductive carbon black) into the ball mill tank at a mass ratio of 7:3, the ball milling medium is raw material, ethanol and ball stone, and the mass ratio of raw material, ethanol and ball stone is 1:5 : 5, take out after ball milling 9h at the rotating speed of 300r / min, make carbon black mixed material after drying; Carbon black mixed material is put into the tubular heating furnace that is full of nitrogen, is warming up to with the speed of 5 ℃ / min 150°C, and kept at 150°C for 9 hours, then increased the temperature to 300°C at the same heating rate, continued to hold at 300°C for 2 hours, and cooled to room temperature to obtain a sulfur-carbon composite material.

[0035] 2) Take 40 mg of nafion membrane solution with a mass fraction of 5% purchased from DuPont of the United...

Embodiment 3

[0039] The preparation method of the sulfur-carbon composite material coated with proton exchange membrane comprises the following steps:

[0040] 1) Put sublimated sulfur and carbon black (super-P conductive carbon black) into the ball mill tank at a mass ratio of 7:3, the ball milling medium is raw material, ethanol and ball stone, and the mass ratio of raw material, ethanol and ball stone is 1:5 : 5, take out after ball milling 9h at the rotating speed of 300r / min, make carbon black mixed material after drying; Carbon black mixed material is put into the tubular heating furnace that is full of nitrogen, is warming up to with the speed of 5 ℃ / min 150°C, and kept at 150°C for 9 hours, then increased the temperature to 300°C at the same heating rate, continued to hold at 300°C for 2 hours, and cooled to room temperature to obtain a sulfur-carbon composite material.

[0041] 2) Take 100 mg of nafion membrane solution with a mass fraction of 5% purchased from DuPont in the Unite...

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Abstract

The invention discloses a proton exchange membrane-coated sulfur-carbon composite material, a preparation method and application thereof, and aims to solve the problem that the battery cycle stability and coulombic efficiency are reduced due to the shuttle effect during the discharge process of the existing lithium-sulfur battery cathode material. In the present invention, the sulfur-carbon composite material coated with a proton exchange membrane is used as the positive electrode material of the lithium-sulfur battery, and the preparation of the material includes steps: 1) preparing the sulfur-carbon composite material; 2) dispersing the sulfur-carbon composite material in the proton exchange membrane solution ; 3) Removing the solvent and drying to obtain a sulfur-carbon composite material coated with a proton exchange membrane. The lithium-sulfur battery assembled with the coating material as the positive electrode and metal lithium has a specific capacity of more than 1500mAh / g for the first time, and after 120 cycles, the capacity can reach 740mAh / g, and the Coulombic efficiency can reach more than 95%. The invention is characterized in that the process is simple, the coating is uniform, and the industrialized production is easy to realize.

Description

technical field [0001] The invention relates to the field of electrochemical technology, in particular to a proton exchange membrane-coated sulfur-carbon composite material, a preparation method and application thereof. Background technique [0002] After years of research, the performance of lithium-ion batteries has been greatly improved. However, due to the limitation of the lithium storage capacity of the electrode material itself, although the battery performance can be improved to a certain extent by improving the preparation process, the energy density of lithium-ion batteries is still very limited and cannot meet the needs of high-power electrical equipment. [0003] A lithium-sulfur battery is a rechargeable secondary battery that uses elemental sulfur as the positive electrode and metallic lithium as the negative electrode. The theoretical specific capacity of elemental sulfur is 1672 mAh g -1 , the theoretical energy density after assembling with lithium metal i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36
CPCH01M4/364H01M10/0525H01M2300/0091Y02E60/10
Inventor 唐其伟赵成龙石永倩刘军
Owner SHANDONG YUHUANG NEW ENERGY TECH
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