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NiCoSe/carbon cloth/S composite lithium-sulfur battery positive electrode material and preparation method thereof

A technology of positive electrode materials and composite materials, which is applied in the field of preparation of electrode materials for lithium-sulfur batteries, can solve the problems of reducing the stability of electrode materials, poor adsorption of polysulfides, damage performance and structure, etc., to suppress the shuttle effect and improve the electrochemical performance. Performance, easy-to-operate effects

Pending Publication Date: 2022-07-29
QILU UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The structural change will lead to a large volume expansion of the electrode material, and repeated volume changes will destroy its own performance and structure, reduce the stability of the electrode material, and rapidly reduce the capacity of the electrode
[0004] Traditional carbon materials can only solve the problem of poor adsorption of polysulfides by controlling their microstructure, which has a single nature, and its effect is not good, and the electrochemical performance still needs to be improved

Method used

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  • NiCoSe/carbon cloth/S composite lithium-sulfur battery positive electrode material and preparation method thereof
  • NiCoSe/carbon cloth/S composite lithium-sulfur battery positive electrode material and preparation method thereof
  • NiCoSe/carbon cloth/S composite lithium-sulfur battery positive electrode material and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0032] A NiCoSe / carbon cloth / S composite lithium-sulfur battery cathode material, prepared by the following method:

[0033] Prepare a piece of cut carbon cloth with acetone, ethanol, and deionized water for 15 min respectively, put it in an oven to dry at 80 °C, and then calcine it at 900 °C for 2 h in an argon atmosphere; take 0.3 g cobalt nitrate hexahydrate and 0.3 g cobalt nitrate hexahydrate and 0.3 g Nickel nitrate hexahydrate was added to 20 ml methanol solution, stirred for 10-20 min to prepare solution A; 3.28 g of 2-methylimidazole was added to 20 ml methanol solution, stirred and dissolved to prepare solution B; solution B was added into solution A, stirred for 20-30min, and then transferred to the reaction kettle together with the pretreated carbon cloth at 120°C, and reacted for 14 h; the heat-treated carbon cloth was rinsed with ethanol for 2-4 times, and the The cleaned carbon cloth was placed in an oven to dry at 80 °C; the dried carbon cloth and 0.5 g of sele...

Embodiment 2

[0036] A NiCoSe / carbon cloth / S composite lithium-sulfur battery cathode material, prepared by the following method:

[0037] Prepare a cut carbon cloth with acetone, ethanol, and deionized water for 10 min respectively, put it in an oven to dry at 80 °C, and then calcine it at 900 °C for 3 h in an argon atmosphere; take 0.6 g of cobalt nitrate hexahydrate and 0.3 g of cobalt nitrate hexahydrate. Nickel nitrate hexahydrate was added to 35 ml methanol solution, stirred for 10-20 min, to prepare solution A; 4.92 g of 2-methylimidazole was added to 35 ml methanol solution, stirred and dissolved to prepare solution B; solution B was added into solution A, stirred for 20-30min, and then transferred to the reaction kettle together with the pretreated carbon cloth at 120°C, and reacted for 16 h; the heat-treated carbon cloth was rinsed with ethanol for 2-4 times, and the The cleaned carbon cloth was placed in an oven to dry at 80 °C; the dried carbon cloth and 0.5 g of selenium powder...

Embodiment 3

[0040] A NiCoSe / carbon cloth / S composite lithium-sulfur battery cathode material, prepared by the following method:

[0041] Prepare a cut carbon cloth with acetone, ethanol, and deionized water for 10 min respectively, put it in an oven to dry at 80 °C, and then calcine it at 900 °C for 3 h in an argon atmosphere; take 0.6 g of cobalt nitrate hexahydrate and 0.6 g of cobalt nitrate hexahydrate. Nickel nitrate hexahydrate was added to 35 ml methanol solution, stirred for 10-20 min to prepare solution A; 6.56 g of 2-methylimidazole was added to 35 ml methanol solution, stirred and dissolved to prepare solution B; solution B was added into solution A, stirred for 20-30min, and then transferred to the reaction kettle together with the pretreated carbon cloth at 120°C, and reacted for 16 h; the heat-treated carbon cloth was rinsed with ethanol for 2-4 times, and the The cleaned carbon cloth was placed in an oven to dry at 80 °C; the dried carbon cloth and 0.5 g selenium powder wer...

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Abstract

The invention belongs to the technical field of preparation of lithium-sulfur battery electrode materials, and particularly relates to a NiCoSe / carbon cloth / S composite lithium-sulfur battery positive electrode material and a preparation method thereof. The honeycomb-shaped CoNiSe / carbon cloth composite material is synthesized by adopting an in-situ growth and heat treatment method, and the composite material is used for a positive electrode of a lithium-sulfur battery after being subjected to sulfur loading. According to the positive electrode material, carbon fiber cloth serves as a three-dimensional carbon material conductive network, NiCoSe is compounded on the carbon fiber cloth to form a NiCoSe / carbon cloth composite material, elemental sulfur is loaded on the NiCoSe / carbon cloth composite material, and NiCoSe is cobalt-nickel bimetallic selenide with a honeycomb structure. Compared with a traditional flexible electrode material, the prepared electrode material has more excellent conductivity and stability, the adsorption effect of the carbon cloth on polysulfide is improved by compounding the carbon cloth with double transition metal selenide, the shuttle effect is inhibited, and the cycling stability and the electrochemical performance of the battery are greatly improved.

Description

technical field [0001] The invention belongs to the technical field of preparation of lithium-sulfur battery electrode materials, in particular to a NiCoSe / carbon cloth / S composite lithium-sulfur battery positive electrode material and a preparation method thereof. Background technique [0002] Lithium-sulfur batteries use sulfur as the active material, which has high theoretical specific capacity and energy density. The reserves of sulfur on earth are abundant and the price is low, which can reduce the cost of batteries. Therefore, the development of lithium-sulfur batteries has great application prospects. Even though lithium-sulfur batteries have many advantages, the problems they face still restrict their large-scale development and commercial applications. The host materials of sulfur are mostly carbon materials, such as carbon nanotubes, graphene and porous carbon as matrix materials to support sulfur. The structural change of elemental sulfur during the charging and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M4/38H01M4/04H01M10/052
CPCH01M4/62H01M4/628H01M4/625H01M4/38H01M4/04H01M10/052
Inventor 任慢慢王贺苏晗刘伟良杨铭志马文庆
Owner QILU UNIV OF TECH
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