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Lithium-sulfur battery composite cathode active material and its preparation and application

A composite positive electrode and active material technology, applied in lithium batteries, battery electrodes, nanotechnology for materials and surface science, etc., can solve problems such as adsorption, and achieve lower liquid-sulfur ratio, good electronic conductivity and electrocatalytic activity , the effect of increasing the content of active substances

Active Publication Date: 2021-04-27
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 cathode active material and its preparation and application
  • Lithium-sulfur battery composite cathode active material and its preparation and application
  • Lithium-sulfur battery composite cathode active material and its preparation and application

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 cathode material. More specifically, the present invention relates to a composite positive electrode active material for a lithium-sulfur battery, comprising a porous carbon with a through-pore structure in which template etching holes are formed; vanadium selenide nanosheets filled in pore chambers of the porous carbon in situ; and elemental sulfur source. The invention also provides the preparation and application of the material. According to the material of the present invention, the vanadium selenide material used as a conductive substrate in the charging and discharging interval of the lithium-sulfur battery can contribute a part of the capacity through the intercalation reaction, and at the same time, the vanadium selenide material can greatly improve the large liquid absorption capacity of the traditional porous carbon base material. In addition, vanadium selenide can improve the adsorption capacity of carbon substrates to polysulfides and efficiently catalyze the conversion of polysulfides, and cooperate with porous carbon to suppress the shuttle effect. Therefore, the lithium-sulfur battery according to the present invention has high energy density, good high-rate discharge, and exhibits excellent discharge capacity and life 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 Patents(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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