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Active quantum dots@porous carbon materials and their preparation and application in lithium-sulfur batteries

A porous carbon material, lithium-sulfur battery technology, applied in lithium batteries, active material electrodes, battery electrodes, etc., can solve the problems of weak chemical adsorption capacity and weak chemical polarity of lithium polysulfides

Active Publication Date: 2021-04-09
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Compared with metal oxides and sulfides, metal nitrides have the advantage of higher metal conductivity, but generally have weaker chemical polarity, resulting in weaker chemical adsorption capacity for lithium polysulfides

Method used

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  • Active quantum dots@porous carbon materials and their preparation and application in lithium-sulfur batteries
  • Active quantum dots@porous carbon materials and their preparation and application in lithium-sulfur batteries
  • Active quantum dots@porous carbon materials and their preparation and application in lithium-sulfur batteries

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0098] 5 kg of starch, 5 kg of 50nmSiO 2 Add the template dispersion and 50 g of sodium dodecylsulfonate into 10 L of deionized water, stir at 80°C for 5 hours, dry the slurry at 120°C, pulverize the dried slurry, and Carburize in a carbonization furnace at 1200°C for three hours in an atmosphere; the carbonized product is washed to remove SiO with 10M sodium hydroxide solution at a temperature of 100°C 2 Template; wash repeatedly with deionized water until the pH of the washing solution is neutral. Then the carbon material was dried and dispersed in alcohol, and ultrasonicated for 2 hours to form a uniform dispersion. Add 30ml tetrabutyl titanate solution and continue ultrasonication for one hour, then heat and stir at 80°C to remove alcohol, stop heating when there is still a small amount of alcohol in the mixture, put the material into the fluidized bed, and blow nitrogen (30L / min) Suspend the material and then increase the water vapor content in the nitrogen until it cha...

Embodiment 2

[0101] Compared with Example 1, the main difference is that the preparation process of the porous template carbon is adjusted, specifically:

[0102] 5 kg of starch, 5 kg of 500nmSiO 2 Add the template dispersion and 50 g of sodium dodecylsulfonate into 10 L of deionized water, stir at 80°C for 5 hours, dry the slurry at 120°C, pulverize the dried slurry, and Carburize in a carbonization furnace at 800°C for three hours in an atmosphere; the carbonized product is washed with 10M sodium hydroxide solution at a temperature of 100°C to remove SiO 2 Template; wash repeatedly with deionized water until the pH of the washing solution is neutral. Then the carbon material was dried and dispersed in alcohol, and ultrasonicated for 2 hours to form a uniform dispersion. Add 30ml tetrabutyl titanate solution and continue ultrasonication for one hour, then heat and stir at 80°C to remove alcohol, stop heating when there is still a small amount of alcohol in the mixture, put the material in...

Embodiment 3

[0105] Compared with Example 1, the main difference is that the preparation process of the porous template carbon and the ratio of the porous carbon to the titanium source are adjusted, specifically:

[0106] 5 kg of starch, 5 kg of 150nmSiO 2 Add the template dispersion and 50 g of sodium dodecylsulfonate into 10 L of deionized water, stir at 80°C for 5 hours, dry the slurry at 120°C, pulverize the dried slurry, and Carburize in a carbonization furnace at 1000°C for three hours in an atmosphere; the carbonized product is washed to remove SiO with 10M sodium hydroxide solution at a temperature of 100°C 2 Template; wash repeatedly with deionized water until the pH of the washing solution is neutral. Then the carbon material was dried and dispersed in alcohol, and ultrasonicated for 2 hours to form a uniform dispersion. Add 10ml tetrabutyl titanate solution and continue ultrasonication for one hour, then heat and stir at 80°C to remove alcohol, stop heating when there is still...

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Abstract

The invention belongs to the field of lithium-sulfur batteries, and specifically relates to an active quantum dot@porous carbon material, including porous carbon, and an active quantum dot supported on the porous carbon in situ; the active quantum dot is titanium nitride, and / or or titania-titanium nitride heterojunction. The invention also relates to a fluidized preparation method of the material and its application in lithium-sulfur batteries. The material of the present invention can significantly improve the resistance of the material to polysulfide by loading the titanium nitride quantum dots and / or silicon dioxide-titanium nitride heterojunction quantum dots in situ on the porous carbon. The adsorption and catalytic performance of sulfur can significantly improve the rate performance, capacity and cycle performance of the sulfur-loaded material.

Description

technical field [0001] The invention relates to the field of battery electrode material preparation, in particular to a lithium-sulfur battery cathode material. Background technique [0002] Lithium-sulfur batteries have been considered as one of the most promising energy storage systems for new-generation electric vehicles and large-scale grid energy storage systems since they were first proposed in the 1960s. Because it can provide a theoretical energy density (2600Wh / kg) that is 5 times higher than that of traditional lithium-ion batteries, and its positive active component sulfur has a high theoretical specific capacity of 1675mAh / g. In addition, sulfur as an active substance is inexpensive, non-toxic, and abundant. Although the lithium-sulfur battery is considered to be a promising high specific energy secondary battery system, it still faces low active material utilization, short cycle life, high self-discharge rate, and poor rate performance during development. Many...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/58H01M4/62H01M10/052
CPCH01M4/362H01M4/38H01M4/5815H01M4/625H01M10/052H01M2004/028Y02E60/10
Inventor 张治安郑景强赖延清姜怀覃富荣洪波张凯李劼
Owner CENT SOUTH UNIV
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