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Double-electrolyte system lithium sulphur battery and preparing method thereof

A dual-electrolyte, lithium-sulfur battery technology, applied in the manufacture of electrolyte batteries, non-aqueous electrolyte batteries, lithium batteries, etc., can solve the problems of low active sulfur content in electrodes, difficult to meet, cumbersome process, etc., achieve high stability and inhibit corrosion effect of behavior

Inactive Publication Date: 2014-01-22
SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, if sulfide glass ceramics are used as the electrolyte, a large amount of electrolyte materials must be added to the positive electrode to increase the conductivity of the sulfur positive electrode, which will result in a low content of active sulfur in the electrode. At the same time, this preparation process requires a higher pressure to make each The components are in close contact, the process is relatively cumbersome, and the battery can only work at a small current, which is difficult to meet the needs of energy storage batteries for electric vehicles

Method used

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  • Double-electrolyte system lithium sulphur battery and preparing method thereof
  • Double-electrolyte system lithium sulphur battery and preparing method thereof
  • Double-electrolyte system lithium sulphur battery and preparing method thereof

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Effect test

Embodiment 1

[0038] 1. Mix conductive carbon black and sublimated sulfur uniformly by ball milling. After the solvent volatilizes, conduct vacuum heat treatment at 155°C to obtain sulfur / carbon composites. After coating, dry to prepare the positive electrode of the battery;

[0039] Two, will Li 2 CO 3 , α-Al 2 o 3 、GeO 2 , NH 4 h 2 PO 4 According to the atomic ratio of Li:Al:Ge:P=1.5:0.5:1.5:3, carry out ball milling, drying, and sieving, and roast the obtained powder at 800°C for 6h to obtain LAGP powder, and press the LAGP powder After sintering at 900°C for 12 hours to obtain LAGP ceramic sheets;

[0040] 3. Seal the ceramic sheet in the designed mold, and use glass fiber membrane to absorb 1mol / L bis(trifluoromethylsulfonate)imide lithium 1,3-dioxolane / ethylene glycol dimethyl ether based electrolysis After the liquid (LiTFSI DME / DOL), paste it on the side of the ceramic sheet, and then press the lithium sheet on the glass fiber membrane to seal the negative electrode side; a...

Embodiment 2

[0044] 1. Ultrasonically disperse graphene into water, add sodium thiosulfate to stir, add hydrochloric acid dropwise to hydrolyze sodium thiosulfate to generate nano-sulfur on the surface of graphene, and finally obtain a self-supporting graphene / sulfur battery positive electrode by suction filtration;

[0045] Two, will Li 2 CO 3 , α-Al 2 o 3 、GeO 2 , NH 4 h 2 PO 4 According to the atomic ratio Li:Al:Ge:P=1.5:0.5:1.5:3, perform ball milling, drying, and sieving, and roast the obtained powder at 800°C for 6 hours to obtain LAGP powder, and press the powder into tablets Afterwards, sinter at 900°C for 12 hours to obtain LAGP ceramic sheets;

[0046] 3. Seal the LAGP ceramic sheet in the designed mold, absorb 1mol / L LiTFSIDME / DOL organic electrolyte with a glass fiber membrane and stick it on one side of the LAGP ceramic sheet, then press a lithium sheet on the glass fiber membrane, and place the negative side For sealing, a layer of 0.3M LiTFSI+0.2M Li is also adsorbed...

Embodiment 3

[0048] 1. Treat the carbon nanotubes with concentrated nitric acid to form functional groups on the surface, then ultrasonically disperse them into the aqueous solution, and finally obtain the positive electrode of the carbon nanotube membrane battery by suction filtration;

[0049] Two, will Li 2 CO 3 , α-Al 2 o 3 、TiO 2 , NH 4 h 2 PO 4 According to the atomic ratio of Li:Al:Ti:P=1.4:0.4:1.6:3, perform ball milling, drying, and sieving, and the obtained powder is first calcined at 350°C for 2h, and then calcined at 800°C for 0.5h , to obtain LATP powder, press the powder into tablets and sinter at 900°C for 6 hours to obtain LATP ceramic sheets;

[0050] 3. Seal the ceramic sheet in the designed mold, absorb 1mol / L LiTFSI DME / DOL organic electrolyte with a glass fiber membrane and stick it on one side of the ceramic sheet, then press a lithium sheet on the glass fiber membrane, and place the negative electrode side Sealed, add a layer of 2M Li on the positive side 2 ...

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Abstract

The invention relates to a double-electrolyte system lithium sulphur battery and a preparing method thereof. The double-electrolyte system lithium sulphur battery comprises a positive electrode and a negative electrode, wherein solid electrolyte is arranged between the positive electrode and the negative electrode, and the gap between the solid electrolyte and the positive electrode and the gap between the solid electrolyte and the negative electrode are filled with electrolyte solution or polymer electrolyte. The positive electrode and the negative electrode are separated by the solid electrolyte, the gap between the solid electrolyte and the positive electrode and the gap between the solid electrolyte and the negative electrode are filled with the electrolyte solution or the polymer electrolyte, polysulfide is prevented from shuttling between the positive electrode and the negative electrode, the full contact between electrode active materials and electrolyte is guaranteed, and accordingly active materials in electrodes can be well utilized. The lithium sulphur battery of a new structure can fundamentally solve the shuttling effect and can achieve high electrochemical performance.

Description

technical field [0001] The invention relates to a lithium-sulfur battery and a preparation method thereof, in particular to a lithium-sulfur battery with a dual electrolyte system and a preparation method thereof, belonging to the technical field of lithium-sulfur batteries. Background technique [0002] With the rapid development of the economy, the energy crisis and environmental pollution have become two major focuses of global attention. According to the current consumption rate, oil resources are facing depletion. Transportation, which consumes the most oil, emits exhaust gas that seriously pollutes the atmospheric environment. In recent years, it has caused severe smog in our country and caused a wide range of respiratory diseases. Among the many energy-saving and emission-reduction measures, the development of new energy vehicles is an extremely important task. At present, many hybrid vehicles have been used on a large scale. In order to improve the endurance and sa...

Claims

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Application Information

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IPC IPC(8): H01M10/052H01M10/056H01M10/058
CPCH01M10/052H01M10/0562H01M10/0563H01M10/058Y02E60/10Y02P70/50
Inventor 温兆银靳俊王清松马国强鹿燕刘才吴梅芬吴相伟
Owner SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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