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Preparation method of lithium-sulfur battery applicable to industrialized production

A lithium-sulfur battery and conductive agent technology, applied in the field of electrochemical batteries, can solve the problems of cumbersome and difficult preparation of lithium-sulfur battery positive electrodes, achieve significant commercial value, and inhibit dissolution

Inactive Publication Date: 2015-09-30
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a method for preparing the positive electrode material of lithium-sulfur batteries suitable for large-scale industrial production, so as to solve the problem of tedious and difficult preparation of the existing lithium-sulfur battery positive electrodes

Method used

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  • Preparation method of lithium-sulfur battery applicable to industrialized production
  • Preparation method of lithium-sulfur battery applicable to industrialized production
  • Preparation method of lithium-sulfur battery applicable to industrialized production

Examples

Experimental program
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Embodiment 1

[0032] A preparation of a lithium-sulfur battery suitable for industrialized production, comprising the following steps:

[0033] Pretreatment of graphene:

[0034] Graphene (with a sheet diameter of 10-20 microns, a thickness of 5-20 nanometers, and a specific surface area of ​​34.193m 2 / g) spread evenly on a clean glass plate, and put it into a plasma cleaner to clean it. During the cleaning process, the working voltage was set to 600V, the oxygen flow rate was set to 500mL / min, and the cleaning time was 5 minutes. After cleaning, the graphene was put into a vacuum drying oven and stored at 50°C for future use.

[0035] Pretreatment of carbon cloth collector:

[0036] Carbon cloth (thickness 0.32 ~ 0.36mm, density 150 ~ 175g / cm 3 ) on a clean glass plate, and put it into an oxygen plasma cleaning machine to clean it. During the cleaning process, the working voltage was set to 600V, the oxygen flow rate was set to 500mL / min, and the cleaning time was 5 minutes. After cle...

Embodiment 2

[0057] Pretreatment of graphene:

[0058] Graphene (with a sheet diameter of 10-20 microns, a thickness of 5-20 nanometers, and a specific surface area of ​​34.193m 2 / g) spread evenly on a clean glass plate, and put it into a plasma cleaner to clean it. During the cleaning process, the working voltage was set to 600V, the oxygen flow rate was set to 500mL / min, and the cleaning time was 5 minutes. After cleaning, the graphene was put into a vacuum drying oven and stored at 50°C for future use.

[0059] Positive pole piece preparation:

[0060] Mix graphene and elemental sulfur with a mass ratio of 3:7, then put the mixture in a high-speed ball mill with ethanol as a solvent, set 500 cycles per minute, and run for 24 hours. Take the mixed solution out of the ball mill, put it upside down in a clean glass watch glass, and dry it in vacuum at 50°C for 24 hours to obtain the graphene / sulfur composite powder; place the composite powder in a tube furnace, Under the protection of ...

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Abstract

The invention relates to a preparation method of a lithium-sulfur battery applicable to the industrialized production, and belongs to the field of an electrochemical battery. A battery positive electrode adopts a mixture obtained by simply processing a graphene material capable of being commercialized and realizing mass production and elemental sulfur. The graphene plays a role in mechanical isolation on one aspect, so that the volume variation of sulfur in the charging-discharging process can be inhibited; on the other aspect, the pass-through effect of polysulfide in electrolyte as well as corrosion of polysulfide on a lithium cathode can be prevented to a certain extent by virtue of good space structure, so that the specific discharge capacity of the charging and discharging of the lithium-sulfur battery can be improved. Under the 0.2C current density, the primary discharging capacity can reach 1370mAh.g<-1> or more. After the battery is cycled for 95 times, the capacity still can be maintained about 1000mAh.g<-1>. After the battery is cycled for 30 times, the capacity tends to be stable, and the capacity is maintained at 90 percent or more.

Description

technical field [0001] The invention relates to the preparation of a lithium-sulfur battery suitable for industrial production, belonging to the field of electrochemical batteries. Background technique [0002] At present, with the development of science and technology, especially the emergence of power vehicles, the chemical power sources used are required to have lighter weight, smaller volume, larger capacity, longer life and higher safety, etc. For example, the lithium-ion battery packs used in the current commercialized power vehicles can only provide a range of 300-500 kilometers, which is difficult to meet people's driving needs. Lithium-sulfur batteries usually use metallic lithium as the negative electrode and elemental sulfur or sulfur-carbon composite materials as the positive electrode to construct the battery system. When the complete conversion reaction occurs, two electrons can be transferred, and its theoretical specific capacity can reach 1685mAh / g. 10 time...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/62H01M10/058
CPCH01M4/362H01M4/625H01M4/663H01M10/058Y02E60/10Y02P70/50
Inventor 孙克宁岳昕阳孙旺王振华
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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