Lithium-sulfur battery composite positive electrode active material and preparation and application thereof

A composite cathode and active material technology, applied in battery electrodes, lithium storage batteries, nanotechnology for materials and surface science, etc., can solve problems such as adsorption, reduce liquid-sulfur ratio, lower carbon content, and improve electrical performance. Effect

Active Publication Date: 2020-06-05
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, for an industrial lithium-sulfur battery with high sulfur loading and low electrolyte usage, the limited chemical adsorption sites are often unable to completely adsorb such a high concentration of lithium polysulfides.

Method used

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  • Lithium-sulfur battery composite positive electrode active material and preparation and application thereof
  • Lithium-sulfur battery composite positive electrode active material and preparation and application thereof
  • Lithium-sulfur battery composite positive electrode active material and preparation and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0064] 5 kg of starch, 5 kg of 100nm SiO 2 Add template dispersion liquid and 50 grams of sodium dodecylsulfonate to 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 dry the carbon material and mix 2 kg of ammonium metavanadate and 2 kg of selenium powder, ball mill at 300 rpm for 3 hours, then heat-treat the mixed powder at 600 degrees for 2 hours in argon atmosphere pyrolysis furnace , the heating rate is 5°C / min. The porous carbon vanadium selenide composite material can be obtained. The pore volume of the material is 2.24cm 3 / g, the specific surface area is 1468m 2 / g, the porous carbon material pore diameter is mainly conc...

Embodiment 2

[0067] Compared with Example 1, the main difference is that the temperature of the carbon preparation process is changed, specifically:

[0068] 5 kg of starch, 5 kg of 100nm SiO 2 Add template dispersion liquid and 50 grams of sodium dodecylsulfonate to 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 dry the carbon material and mix 2 kg of ammonium metavanadate and 2 kg of selenium powder, ball mill at 300 rpm for 3 hours, then heat-treat the mixed powder at 600 degrees for 2 hours in argon atmosphere pyrolysis furnace , the heating rate is 5°C / min. The porous carbon vanadium selenide composite material can be obtained. The po...

Embodiment 3

[0071] Compared with Example 1, the main difference is that the size of the template in the carbon preparation process is changed, specifically:

[0072] 5 kg of starch, 5 kg of 500nm SiO 2 Add template dispersion liquid and 50 grams of sodium dodecylsulfonate to 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 dry the carbon material and mix 2 kg of ammonium metavanadate and 2 kg of selenium powder, ball mill at 300 rpm for 3 hours, then heat-treat the mixed powder at 600 degrees for 2 hours in argon atmosphere pyrolysis furnace , the heating rate is 5°C / min. The porous carbon vanadium selenide composite material can be obtained...

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Abstract

The invention relates to a novel lithium-sulfur battery positive electrode material. More specifically, the invention relates to a lithium-sulfur battery composite positive electrode active material.The material comprises a plurality of template etching holes, porous carbon with a through hole structure, a vanadium selenide nanosheet filled in a pore cavity of the porous carbon in situ, and an elemental sulfur source. The invention also provides preparation and application of the material. According to the material of the invention, the vanadium selenide material serving as a conductive substrate in the charge-discharge interval of the lithium-sulfur battery can contribute a part of capacity through intercalation reaction; meanwhile, the vanadium selenide material can greatly improve theproblem of large liquid absorption capacity of a traditional porous carbon substrate material, and the liquid sulfur ratio of the lithium-sulfur battery is remarkably reduced; and, in addition, vanadium selenide can improve the adsorption capacity of the carbon substrate to polysulfide and efficiently catalyze conversion of polysulfide, and the shuttle effect is inhibited in cooperation with porous carbon. Therefore, the lithium-sulfur battery according to the present invention has high energy density and good high-rate discharge, and reprents excellent discharge capacity and lifespan characteristics.

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] The gradual depletion of fossil energy, the rapid development of portable electronic devices, electric and hybrid vehicles and large energy storage devices force people to develop secondary batteries with higher energy density. What is different from conventional lithium-ion batteries is the insertion and extraction of lithium ions in the positive and negative electrodes; the charging and discharging process of the negative electrode of lithium metal batteries is the dissolution and deposition process of lithium metal; its basic reaction formula is: charging: Li + +e=Li; discharge: Li-e=Li + . Its corresponding theoretical specific energy is 3860mAh / g, and the lowest redox potential (-3.040V vs. standard hydrogen electrode). [0003] As a type of lithium metal battery, lithium-sulfur ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58H01M4/62H01M10/052C01B32/05C01B19/04B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00C01B19/007C01P2004/03C01P2006/40C01B32/05H01M4/581H01M4/625H01M10/052Y02E60/10
Inventor 张治安郑景强赖延清谢杨洋覃富荣洪波张凯李劼
Owner CENT SOUTH UNIV
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