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Preparation method of composite nanostructure double-effect sulfur fixation type lithium-sulfur battery anode material

A composite nanostructure and cathode material technology, which is applied in the field of preparation of new energy materials, can solve problems such as side reactions and affecting the cycle stability of lithium-sulfur batteries, and achieve the effects of improving cycle life, improving electrochemical performance, and convenient operation

Inactive Publication Date: 2018-06-15
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Polysulfides can dissolve in the electrolyte and migrate to the positive electrode of the battery, leading to a series of side reactions
The shuttle effect will also lead to Li 2 S 2 and Li 2 S randomly precipitates on the positive electrode, which changes the morphology of the electrode material and affects the cycle stability of the lithium-sulfur battery.

Method used

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  • Preparation method of composite nanostructure double-effect sulfur fixation type lithium-sulfur battery anode material
  • Preparation method of composite nanostructure double-effect sulfur fixation type lithium-sulfur battery anode material
  • Preparation method of composite nanostructure double-effect sulfur fixation type lithium-sulfur battery anode material

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Experimental program
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Effect test

Embodiment 1

[0019] (1) Put thioacetamide and stannous chloride with a molar ratio of 5:1 in a certain volume of isopropanol, stir magnetically for 90 minutes to form a clear solution, then add titanium dioxide nanotubes, and react at 170°C for 24 hours Obtained nanotube A modified by tin disulfide nanosheets 1 .

[0020] (2) Add a certain concentration of cysteine ​​ligand to the nanotubes obtained in step (1), after vacuuming for 10 minutes, transfer the nanotubes to a blast drying oven, and dry at 60°C for 3 hours to obtain the ligand Further Modified Nanotube A 2 .

[0021] (3) Dissolve elemental sulfur in carbon disulfide, ultrasonically disperse to form a suspension, and pump the suspension to nanotube A by vacuuming 2 In the process, after evaporating the solvent, put it in a muffle furnace for 24 hours of low-temperature heat treatment at 155 ° C, and then naturally cool to room temperature to obtain the composite material.

[0022] figure 1 The X-ray diffraction pattern of th...

Embodiment 2

[0024] (1) Put thioacetamide and cobalt acetate at a molar ratio of 6:1 in a certain volume of n-propanol, stir magnetically for 70 minutes to form a clear solution, then add titanium dioxide nanotubes, react at 190°C for 18 hours to obtain vulcanization Cobalt nanosheet-modified nanotube A 1 .

[0025] (2) Add a certain concentration of glycine ligand to the nanotubes obtained in step (1), and after evacuating for 20 minutes, transfer the nanotubes to a blast drying oven, and dry them at 80°C for 2 hours to obtain further modified ligands. Nanotube A 2 .

[0026] (3) Dissolve elemental sulfur in carbon disulfide, ultrasonically disperse to form a suspension, and pump the suspension to nanotube A by vacuuming 2 The composite material was obtained after evaporating the solvent to dryness and putting it into a muffle furnace for 14 hours of low-temperature heat treatment at 165°C, and then cooling it naturally to room temperature.

[0027] figure 2 It is a scanning electro...

Embodiment 3

[0029] (1) Put thiourea and tin tetrachloride at a molar ratio of 6:1 in a certain volume of n-butanol, stir magnetically for 30 minutes to form a clear solution, then add vanadium oxide nanotubes, and react at 190°C for 12 hours to obtain Nanotubes A decorated with vanadium sulfide nanosheets 1 .

[0030] (2) Add a certain concentration of thioglycolic acid ligand to the nanotubes obtained in step (1), and after vacuuming for 30 minutes, transfer the nanotubes to a blast drying oven, and dry them at 90°C for 2 hours to obtain the ligands Further Modified Nanotube A 2 .

[0031] (3) Dissolve elemental sulfur in carbon disulfide, ultrasonically disperse to form a suspension, and pump the suspension to nanotube A by vacuuming 2 In the process, after evaporating the solvent, put it into a muffle furnace for 185°C low-temperature heat treatment for 12 hours, and then naturally cool to room temperature to obtain the composite material.

[0032] image 3 It is a transmission el...

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Abstract

The invention provides a preparation method of a composite nanostructure double-effect sulfur fixation type lithium-sulfur battery anode material. A nanotube structure is used as a support, nanosheetsare grown in a nanotube via a hydrothermal reaction to form a physical barrier, an organic ligand is added to perform chemical coordination so as to realize a physical-chemical double-effect sulfur fixation structure, and sulfur is injected into the nanotube via carbon disulfide sulfur injection to obtain the lithium-sulfur battery anode material. The composite nanostructure achieves the purposeof high-efficiency sulfur fixation via physical sulfur fixation and chemical sulfur fixation, the preparation method provided by the invention has the advantages of easy acquisition of raw materials,simple process, convenient operation, low cost, environmental friendliness and the like, the requirements for the preparation equipment in the entire reaction process are low, thereby being conduciveto the industrial production, and the prepared material can effectively inhibit the shuttle effect of polysulfide, prolong the cycle life of the lithium-sulfur battery, relieve the volume expansion, and improve the electrochemical performance of the lithium-sulfur battery, so that the prepared material is further applied to the field of new energy resources.

Description

technical field [0001] The invention specifically relates to a preparation method of a composite nanostructure double-effect sulfur-fixing lithium-sulfur battery cathode material, which belongs to the technical field of preparation of new energy materials. Background technique [0002] Lithium-sulfur batteries have many advantages such as high energy density, low cost, and environmental friendliness, and are considered to be the most promising next-generation secondary battery system. However, the low cycle life still limits the commercial application of lithium-sulfur batteries. The high attenuation of lithium-sulfur batteries is caused by many factors, including polysulfides (Li 2 S x ,4≤x≤8), the large volume change of sulfur during charging and discharging (~80%) and the insulating properties of sulfur. In order to improve the cycle life of lithium-sulfur batteries, it is crucial to suppress the dissolution of polysulfides. Polysulfides can dissolve in the electrolyt...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/052B82Y30/00
CPCB82Y30/00H01M4/362H01M4/38H01M4/628H01M10/052H01M2004/021H01M2004/028Y02E60/10
Inventor 陈卓应豆
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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