Preparation method of a metal-modified three-dimensional carbon network loaded metal-organic framework as a cathode material for lithium/sodium-sulfur batteries

A sodium-sulfur battery and metal modification technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems that hinder the practical application of lithium-sulfur batteries and room temperature sodium-sulfur batteries, reduce active materials, etc., and achieve enhanced conductivity and overall Effects of structural stability, enhanced electrical conductivity and catalytic performance

Active Publication Date: 2022-04-19
山东济清科技服务有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, due to the insulating properties of sulfur itself and the generation of polysulfides during cycling, the reduction of active materials and the shuttle effect have seriously hindered the practical application of lithium-sulfur batteries and room temperature sodium-sulfur batteries.

Method used

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  • Preparation method of a metal-modified three-dimensional carbon network loaded metal-organic framework as a cathode material for lithium/sodium-sulfur batteries
  • Preparation method of a metal-modified three-dimensional carbon network loaded metal-organic framework as a cathode material for lithium/sodium-sulfur batteries

Examples

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specific Embodiment example 1

[0022] Specific implementation example 1: take corn bran, corn dregs, cobalt nitrate, dimethylimidazole, and methanol as raw materials. First select about 3g of corn husks, then wash them and add them to 100 mL of 0.1 mol / L cobalt nitrate solution, stir in a water bath at 80°C for 24 hours, filter the product briefly and then dry it at 80°C overnight, and then put the dried product in an air atmosphere at 300°C Incubate for 2 h, mix the obtained product with KOH at a mass ratio of 1:1, add a small amount of distilled water and stir for 24 h, then centrifuge, wash with dilute hydrochloric acid, the concentration of hydrochloric acid is 1 mol / L, dry, and dry the product at 700 °C Calcined for 3 h, weighed 0.5 g of the calcined product and added to 100 mL of methanol solution containing 3.7 g of dimethylimidazole, stirred for 30 min, then poured into 50 mL of methanol solution containing 0.7 g of cobalt nitrate, and continued to stir for 24 h. Afterwards, it was centrifuged and d...

specific Embodiment example 2

[0023] Specific implementation example 2: take corn bran, corn dregs, cobalt nitrate, zinc nitrate, dimethylimidazole, and methanol as raw materials. First select about 3g of corn dregs, then wash them and add them to 100 mL of 0.1mol / L cobalt nitrate solution, stir in a water bath at 80°C for 36 hours, filter the product briefly and then dry it at 80°C overnight, then place the dried product in an air atmosphere at 350°C Keep warm for 2 hours, mix the obtained product with KOH at a mass ratio of 1:4, add a small amount of distilled water and stir for 24 hours, then centrifuge, wash with dilute hydrochloric acid, the concentration of hydrochloric acid is 1 mol / L, dry, and dry the product at 800 ° C Calcined for 3 h, weighed 0.5 g of the calcined product and added to 100 mL of methanol solution containing 3.7 g of dimethylimidazole, stirred for 30 min, then poured into 50 mL of methanol solution containing 0.8 g of zinc nitrate, and continued to stir for 24 h , and then centrif...

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Abstract

The invention discloses a method for preparing a metal-modified three-dimensional carbon network loaded metal-organic framework as a positive electrode material of a lithium / sodium-sulfur battery. Its feature is to use the waste materials in the process of corn starch production - corn husks, corn dregs, etc. as raw materials to synthesize three-dimensional conductive carbon network, so as to realize the utilization of waste. It specifically includes the following steps: first, select and wash corn husks and corn dregs, etc., then stir in a solution containing metal ions to make the metal ions adhere, dry, pre-carbonize at low temperature, and then soak in potassium hydroxide solution for further activation. Then calcined at high temperature; then mixed the calcined product in dimethylimidazole methanol solution, added an appropriate amount of zinc nitrate to stir, mixed evenly, centrifuged, dried, and finally calcined in an inert atmosphere to obtain a metal-modified three-dimensional carbon network loaded metal-organic framework compound Material. The invention takes the conductive carbon network as the matrix, fills the organic metal framework and further carbonizes it, improves the conductivity of the material, and also increases the sulfur loading capacity of the material, and the material has good electrochemical performance.

Description

technical field [0001] The invention belongs to the field of preparation of lithium-sulfur or room-temperature sodium-sulfur battery electrode materials, and relates to a three-dimensional conductive matrix prepared from wastes such as corn husks and corn dregs in the starch production process, and combined with metal-organic framework derived carbon materials to prepare lithium-sulfur or room-temperature batteries. A method for anode materials for sodium-sulfur batteries. The raw materials of the three-dimensional conductive carbon network prepared by this method are easy to obtain, and can make full use of the network structure of biological materials to improve the conductivity of the material. In addition, the modification of metal particles and the addition of metal-organic framework-derived carbon structures help to further improve the electronic properties of the material. The electrical conductivity, lithium ion diffusion coefficient and sulfur loading capacity enable ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/583H01M4/62H01M4/60H01M10/0525H01M10/054
CPCY02E60/10
Inventor 任慢慢陈谦武钟文刘伟良杨飞
Owner 山东济清科技服务有限公司
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