Chain structure transition metal polysulfide cathode material for lithium-sulfur battery

A technology of positive electrode materials and transition metals, applied in the field of electrode materials and batteries containing them, to achieve the effects of simple process, long cycle life and convenient operation

Inactive Publication Date: 2019-03-29
BEIHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above three types of methods can all play a role in inhibiting the "polysulfide shuttle" from different perspectives, but each has certain limiting factors

Method used

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  • Chain structure transition metal polysulfide cathode material for lithium-sulfur battery
  • Chain structure transition metal polysulfide cathode material for lithium-sulfur battery
  • Chain structure transition metal polysulfide cathode material for lithium-sulfur battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] A chain structure transition metal polysulfide cathode material for a lithium-sulfur battery, which is prepared by the following steps:

[0035] (1) Sulfur source and transition metal compound, the sulfur source and transition metal organic compound are evenly mixed and added to 1,2-o-dichlorobenzene organic solvent, and reacted by heating. In this embodiment, the sulfur source is sublimed sulfur; the transition metal compound is molybdenum hexacarbonyl, and the molar ratio between the sulfur source and molybdenum hexacarbonyl is 10:1 (total mass 1g). The above materials are uniformly mixed and added to 35 mL of dichlorobenzene , and stir until the mixture is a clear solution.

[0036] (2) Dissolving the sulfur source and the transition metal compound in dichlorobenzene, placing them in a container, and keeping them warm for 2 hours at a high temperature of 185°C;

[0037] (3) centrifuging and drying the mixed solution obtained in (2) to obtain transition metal polysul...

Embodiment 2

[0039] A chain structure transition metal polysulfide cathode material for a lithium-sulfur battery, which is prepared by the following steps:

[0040] (1) Sulfur source and transition metal compound, the sulfur source and transition metal organic compound are uniformly mixed, then added to methanol organic solvent, and reacted by heating. In this embodiment, the sulfur source is thioacetamide; the transition metal compound is ammonium metavanadate, and the mass ratio between the sulfur source and ammonium metavanadate is 5:1 (the total mass is 1 g).

[0041] (2) Dissolve the sulfur source and the transition metal compound in 35mL of methanol, stir for 30min, place in a container, and keep warm at a high temperature of 160°C for 12h;

[0042] (3) centrifuging and drying the mixed solution obtained in (2) to obtain transition metal polysulfides as positive electrode materials. The resulting product is a powder, and the results of X-ray diffraction are shown in Image 6 , prov...

Embodiment 3

[0044] A chain structure transition metal polysulfide cathode material for a lithium-sulfur battery, which is prepared by the following steps:

[0045] (1) Sulfur source and transition metal compound, the sulfur source and transition metal organic compound are evenly mixed and added to 1,2-o-dichlorobenzene organic solvent, and reacted by heating. In this embodiment, the sulfur source is sublimed sulfur; the transition metal compound is molybdenum hexacarbonyl, and the molar ratio between the sulfur source and molybdenum hexacarbonyl is 10:1 (total mass 1g). The above materials are uniformly mixed and added to 35 mL of dichlorobenzene , and stir until the mixture is a clear solution.

[0046] (2) Dissolve the sulfur source and the transition metal compound in dichlorobenzene, place them in a container, and keep them warm for 12 hours at a high temperature of 185°C;

[0047](3) centrifuging and drying the mixed solution obtained in (2) to obtain transition metal polysulfides a...

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Abstract

The invention provides a chain structure transition metal polysulfide cathode material for a lithium-sulfur battery. The cathode material has a chain structure and a chemical formula of MSX, wherein Mrepresents transition metal, which is selected from one of molybdenum, titanium, vanadium, iron and niobium; and X=3-6. The invention also proposes a lithium-sulfur battery made from the chain structure transition metal polysulfide cathode material. The preparation method of the chain structure transition metal polysulfide can be satisfied by simple heating equipment. The process has the characteristics of convenient operation and simple process. By adopting the method, when used as the positive electrode of a secondary lithium-sulfur battery, the obtained transition metal polysulfide can improve the polysulfide dissolution shuttle and other related problems of the lithium-sulfur battery, and the battery can have more stable cycle performance and longer cycle life.

Description

technical field [0001] The invention belongs to the field of battery materials, and in particular relates to an electrode material of a lithium-sulfur battery and a battery containing the same. Background technique [0002] With the rapid development of portable devices, the energy density (~150Wh / kg) of existing commercial lithium-ion batteries can no longer meet the increasing energy demand of portable devices, and there is an urgent need to develop new high-energy-density secondary batteries. Among many candidate batteries, lithium-sulfur batteries have become one of the most promising secondary batteries due to their high energy density, long working and storage life, high safe operation performance, and low cost. [0003] Elemental sulfur is regarded as the most potential cathode material for rechargeable lithium batteries, which has a very high theoretical specific capacity (1675mAh cm -2 ), low price, environmental protection, non-toxic, safety and other outstanding ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G39/06C01G31/00B82Y30/00B82Y40/00H01M4/58H01M10/052
CPCB82Y30/00B82Y40/00C01G31/00C01G39/06C01P2002/72C01P2004/01C01P2004/62C01P2004/64C01P2006/40H01M4/5815H01M10/052H01M2004/021H01M2004/028Y02E60/10
Inventor 杨树斌李彬曹振江
Owner BEIHANG UNIV
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