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Preparation method of NiCo2S4-coated porous carbon skeleton for positive electrode material of lithium-sulphur battery

A cathode material, lithium-sulfur battery technology, used in battery electrodes, lithium storage batteries, non-aqueous electrolyte storage batteries, etc. Diffusion, the effect of improving cycle stability

Active Publication Date: 2019-02-22
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In recent years, the research on sulfur-loading materials has mainly focused on carbon materials and polar materials, among which carbon materials mainly include graphene, carbon nanotubes, porous carbon, hollow carbon spheres, etc., which can physically adsorb lithium polysulfide. The good conductivity of carbon materials also makes up for the shortcomings of poor conductivity of sulfur, but due to the weak binding force between non-polar carbon and polar lithium polysulfide, it cannot have a strong adsorption effect on lithium polysulfide
Polar materials, including transition metal sulfides, transition metal nitrides, etc., can have a strong chemical adsorption effect on lithium polysulfides, but their conductivity is poorer than that of carbon materials.

Method used

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  • Preparation method of NiCo2S4-coated porous carbon skeleton for positive electrode material of lithium-sulphur battery
  • Preparation method of NiCo2S4-coated porous carbon skeleton for positive electrode material of lithium-sulphur battery
  • Preparation method of NiCo2S4-coated porous carbon skeleton for positive electrode material of lithium-sulphur battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] (1) Preparation of nitrogen-doped porous carbon. Weigh 7g of zinc acetate hexahydrate and dissolve it in 200ml of deionized water. Weigh 28g of dimethylimidazole and dissolve it in 200ml of deionized water. After stirring evenly, the two solutions were mixed together. After stirring for 15min, let stand for 24h at room temperature. , centrifuged 3 times with deionized water and methanol, and dried in vacuum at 60 °C for 12 h to obtain ZIF-8 powder. The ZIF-8 powder was placed in a tube furnace, calcined at 800 °C in an argon atmosphere, kept for 2 h, and the heating rate was 5 °C / min. After calcination, the furnace lid was opened, and the sample was cooled to room temperature in an argon atmosphere. , then the sample was taken out from the tube furnace, acidified with 65% concentrated nitric acid, washed with dilute hydrochloric acid to remove zinc, filtered with deionized water and alcohol, and dried at 80 °C for 12 h to obtain nitrogen Doped Porous Carbon.

[0026] ...

Embodiment 2

[0032] The difference from Example 1 is: (2) Preparation of C@NiCo-LDH composite material. The prepared porous carbon, cobalt nitrate hexahydrate, nickel nitrate hexahydrate, and urotropine were added into 40ml deionized water at a molar ratio of 10:60:30:30, stirred at room temperature for 10min, then poured into an Erlenmeyer flask, An oil bath was carried out at 90°C, condensed and refluxed for 3 hours, the reaction product was collected by centrifugation with water and alcohol, and the NiCo-LDH coated porous carbon composite material was obtained after drying at 80°C. The rest are the same as in Embodiment 1, and will not be repeated here.

[0033] Compared with the obtained material in Example 1, the growth of flaky NiCo-LDH in C@NiCo-LDH is not dense enough, resulting in the subsequent growth of flaky NiCo 2 S 4 less and unevenly distributed.

Embodiment 3

[0035] The difference from Example 1 is: (2) Preparation of C@NiCo-LDH composite material. The prepared porous carbon, cobalt nitrate hexahydrate, nickel nitrate hexahydrate, urotropine, and sodium citrate were added to 40ml of deionized water in a molar ratio of 10:120:60:60:10, and stirred at room temperature for 10 minutes. Pour it into a Erlenmeyer flask, place it in an oil bath at 90°C, condense and reflux for 6 hours, collect the reaction product by centrifugation with water and alcohol, and dry it at 80°C to obtain a NiCo-LDH-coated porous carbon composite material. The rest are the same as in Embodiment 1, and will not be repeated here.

[0036] Compared with the obtained material in Example 1, the C@NiCo-LDH composite material can grow a sheet-like NiCo-LDH structure, but it is stuck together and the specific surface area is reduced, which will also lead to a decrease in the loading of active material sulfur.

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Abstract

The invention relates to a preparation method of a NiCo2S4-coated porous carbon skeleton for a positive electrode material of a lithium-sulphur battery. The preparation method comprises the followingsteps: preparing a nitrogen-doped porous carbon skeleton; preparing a C@NiCo-LDH composite material: adding the nitrogen-doped porous carbon skeleton prepared in the last step, cobalt nitrate hexahydrate, nickel nitrate hexahydrate, urotropin and sodium citrate according to the molar ratio of (10-15): (60-120): (30-60):30:10 into deionized water, after stirring uniformly, carrying out oil bathingat a temperature of 70-90 DEG C, carrying out condensation and returning for 3-6 hours, centrifuging reaction products using the deionized water and alcohol, drying to obtain the NiCo-LDH-coated porous composite material which is marked as C@NiCo-LDH; preparing the C@NiCo2S4 composite material; and loading sulfur on the C@NiCo2S4 composite material.

Description

technical field [0001] The invention belongs to the technical field of electrode materials for lithium-sulfur batteries, and in particular relates to a NiCo used for the positive electrode of lithium-sulfur batteries, which can effectively inhibit the dissolution of lithium polysulfide and inhibit the volume expansion of sulfur. 2 S 4 A method for preparing a coated porous carbon framework-supported sulfur cathode. Background technique [0002] Due to the increasingly serious energy crisis and environmental pollution problems, people urgently need to effectively collect and utilize clean energy such as solar energy and wind energy. Today's commercial lithium-ion batteries are limited by the specific capacity of their cathode materials, and it is difficult to meet the increasing performance requirements. The sulfur cathode of lithium-sulfur battery has attracted widespread attention due to its high theoretical specific capacity (1675mAh / g) and high theoretical specific energ...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M10/052
CPCH01M4/366H01M4/5815H01M4/625H01M4/628H01M10/052Y02E60/10
Inventor 师春生刘华雄赵乃勤刘恩佐何春年何芳
Owner TIANJIN UNIV
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