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Preparation method of Ni/Co-CNT/NHPC lithium-sulfur battery positive electrode material

A lithium-sulfur battery and cathode material technology, applied in battery electrodes, lithium batteries, non-aqueous electrolyte batteries, etc., can solve problems such as low specific capacity, achieve strong chemical adsorption and physical adsorption, high specific surface area, and good conductivity Effect

Active Publication Date: 2020-11-03
UNIV OF SCI & TECH BEIJING +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The present invention aims to propose an N-doped hollow porous carbon-lithium-sulfur battery cathode material and its preparation method which can effectively improve the cycle of lithium-sulfur batteries Performance, to a certain extent, solves the problem of low specific capacity of traditional lithium-ion batteries

Method used

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  • Preparation method of Ni/Co-CNT/NHPC lithium-sulfur battery positive electrode material
  • Preparation method of Ni/Co-CNT/NHPC lithium-sulfur battery positive electrode material
  • Preparation method of Ni/Co-CNT/NHPC lithium-sulfur battery positive electrode material

Examples

Experimental program
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Effect test

Embodiment 1

[0042] Step 1. Prepare the precursor solution: disperse 480mg PVP in 30mL methanol solution, sonicate for 1h, then add 0.1mmol Co(NO 3 ) 2 ·6H 2 O, stirred magnetically at room temperature for 1 h to obtain solution A, dispersed 0.1 mmol dimethylimidazole in 30 mL of methanol solution, and stirred magnetically at room temperature for 1 h to obtain solution B. Then quickly pour solution A into solution B, stir magnetically at room temperature for 20 minutes to prepare the precursor solution;

[0043] Step 2. Preparation of ZIF-67: Seal the above-mentioned precursor solution with a parafilm and let it stand at room temperature for 24 hours, then centrifuge at 10,000 r / min for 10 minutes, and then wash with ethanol and deionized water to obtain ZIF-67 The product was dried under vacuum at 75°C for 12 hours;

[0044] Step 3, preparation of Ni-ZIF67: disperse 200mg ZIF-67 powder in ethanol, stir for 30min, add 0.1mmol of Ni(NO 3)2 ·6H 2 O, continue stirring for 40 min, then ce...

Embodiment 2

[0048] Step 1, preparation of precursor solution: same as Step 1 in Example 1;

[0049] Step 2. Preparation of ZIF-67: same as Step 2 in Example 1;

[0050] Step 3, preparation of Ni-ZIF67: same as Step 3 in Example 1;

[0051] Step 4, annealing: mechanically mix 200mg of Ni-ZIF-67 with 1g of melamine powder, fully grind, and place the final products in a tube furnace respectively, 2 / Under Ar atmosphere, heat at 2°C / min to 250°C for 1h, 800°C for 2h, then cool to room temperature;

[0052] Step 5, pickling: same as Step 5 in Example 1.

Embodiment 3

[0054] Step 1, preparation of precursor solution: same as Step 1 in Example 1;

[0055] Step 2. Preparation of ZIF-67: same as Step 2 in Example 1;

[0056] Step 3, preparation of Ni / Zn-ZIF67: same as Step 3 in Example 1;

[0057] Step 4, annealing: mechanically mix 200mg of Ni-ZIF-67 and 1.2g of melamine powder, fully grind, and place the final products in a tube furnace respectively, 2 / Under Ar atmosphere, heat at 2°C / min to 250°C for 1 hour, 800°C for 2h, then cool to room temperature;

[0058] Step 5, pickling: same as Step 5 in Example 1.

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Abstract

The invention belongs to the field of lithium-sulfur battery cathode materials, and provides a preparation method of a high-performance lithium-sulfur battery cathode material derived and synthesizedfrom NiZIF67@Mela. The method comprises the steps: forming N-doped hollow porous carbon (Ni / CoCNT / NHPC) loaded with Ni and Co nanoparticles after NiZIF67 (at) Mela annealing, and growing a large number of CNTs on the surface of the carbon due to the catalytic action of Ni and Co. Melamine provides a rich carbon source and a nitrogen source, the Ni / CoCNT / NHPC electrode material has a high specificsurface area, and the conductivity of the material is improved by CNT generated on the surface of the Ni / CoCNT / NHPC electrode material. Besides, dissolving of polysulfide is limited through chemical adsorption and physical adsorption by means of nitrogen doping and a hollow carbon skeleton structure, the shuttle effect is inhibited, the conversion of polysulfide is catalyzed by generated Ni and Cobimetal nanoparticles, and the obtained Ni / CoCNT / NHPC electrode material integrates rich CNT, a complete hollow skeleton, Ni, Co and N doping; meanwhile, the material has high specific surface area,good conductivity, relatively strong chemical adsorption and physical adsorption and catalytic action on polysulfide, and the performance of the lithium-sulfur battery is further improved.

Description

technical field [0001] The invention belongs to the field of positive electrode materials for lithium-sulfur batteries, and particularly relates to Ni-ZIF-67@Mela annealing to form N-doped hollow porous carbon loaded with Ni and Co nanoparticles, and the surface of the carbon skeleton is catalyzed by Ni and Co nanoparticles. A large number of CNTs were grown, and the preparation method of Ni / Co-CNT / NHPC lithium-sulfur battery cathode material was obtained. Background technique [0002] In recent years, in order to obtain higher energy density, this requires new commercially available energy storage devices to meet the requirements of technological development. As an efficient energy storage system, lithium-sulfur batteries have energy density several times that of lithium-ion batteries. In addition, sulfur also has the advantages of low cost, abundant resources, and environmental protection. However, despite the high theoretical specific capacity of lithium-sulfur batteries...

Claims

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Application Information

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IPC IPC(8): H01M4/62H01M10/052
CPCH01M4/62H01M4/625H01M4/628H01M10/052Y02E60/10
Inventor 闫小琴郑国新王东华纪箴王贯勇
Owner UNIV OF SCI & TECH BEIJING
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