Preparation method of N-doped Co nanocluster/N-doped porous carbon/S composite material for positive electrode of high-performance potassium-sulfur battery

A technology of composite materials and nano-clusters, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of unclear reaction mechanism, affecting the electrochemical performance of potassium-sulfur batteries, and limiting the application of potassium-sulfur batteries, so as to improve the performance of graphite degree of oxidation, reduction of agglomeration, and high catalytic activity

Active Publication Date: 2020-05-19
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the current research on potassium-sulfur batteries is still in the initial stage, and the reaction mechanism is not clear. The insulation of sulfur electrodes, the volume expansion generated during charging and discharging, and the shuttle effect caused by soluble polysulfides seriously affect the performance of potassium-sulfur batteries. Chemical properties, limiting wider application of potassium-sulfur batteries

Method used

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  • Preparation method of N-doped Co nanocluster/N-doped porous carbon/S composite material for positive electrode of high-performance potassium-sulfur battery
  • Preparation method of N-doped Co nanocluster/N-doped porous carbon/S composite material for positive electrode of high-performance potassium-sulfur battery
  • Preparation method of N-doped Co nanocluster/N-doped porous carbon/S composite material for positive electrode of high-performance potassium-sulfur battery

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Embodiment 1

[0032] A method for preparing an N-doped Co nanocluster / N-doped porous carbon / S composite material for a positive electrode of a high-performance potassium-sulfur battery, comprising steps:

[0033] (1) 4.98g Co(NO 3 ) 2 ·6H 2 O was dissolved in 500ml of methanol solution and mixed uniformly to obtain solution A; 6.56g of 2-methylimidazole was dissolved in 500ml of methanol solution and mixed uniformly to obtain solution B; solution B was slowly added dropwise to solution A while stirring, at room temperature After stirring for 30 minutes, stand at room temperature for 24 hours, then centrifuge, wash with methanol, and dry at 60°C for 24 hours to obtain ZIF-67. According to the thermogravimetric test, the initial carbonization temperature of the prepared ZIF-67 is 435°C.

[0034] (2) Place the prepared ZIF-67 in a calciner, calcined in a nitrogen atmosphere, raise the temperature to 435°C for 6h, then raise the temperature to 600°C for 2h, and the heating rate in the above ...

Embodiment 2

[0043] A kind of preparation method of N-doped Co nanocluster / N-doped porous carbon / S composite material used for positive electrode of high-performance potassium-sulfur battery, as described in Example 1, the difference is:

[0044] In step (2), the prepared ZIF-67 was placed in a calciner, calcined in a nitrogen atmosphere, raised to 435°C for 6h, then raised to 550°C for 2h, and the heating rate in the above process was 2°C / min . Then soak 1 g of the above calcined product in 50 mL of 2 mol / L sulfuric acid aqueous solution at room temperature for 6 h to obtain the N-doped Co nanoparticles / N-doped porous carbon composite material.

[0045] Other steps and conditions are consistent with Example 1.

Embodiment 3

[0047] A kind of preparation method of N-doped Co nanocluster / N-doped porous carbon / S composite material used for positive electrode of high-performance potassium-sulfur battery, as described in Example 1, the difference is:

[0048] In step (3), the prepared N-doped Co nanoparticles / N-doped porous carbon composite material and sulfur were uniformly mixed at a mass ratio of 1:1, sealed in a glass tube under vacuum, treated at 155°C for 20h, and then The temperature was raised to 280 °C for 1 h, and the heating rate was 2 °C / min. With the evaporation of S, the Co particles were further cracked into nano-clusters, and N-doped Co nano-clusters / N-doped porous carbon / S composite materials were obtained.

[0049] Other steps and conditions are consistent with Example 1.

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Abstract

The invention provides a preparation method of an N-doped Co nanocluster/N-doped porous carbon/S composite material for a positive electrode of a high-performance potassium-sulfur battery. ZIF-67 is used as an initial raw material, and an N-doped Co nanoparticle/N-doped porous carbon composite material is obtained through low-temperature long-time staged carbonization and acid aqueous solution soaking; and the obtained N-doped Co nanoparticle/N-doped porous carbon composite material is compounded with sulfur to obtain the N-doped Co nanocluster/N-doped porous carbon/S composite material. According to the method disclosed by the invention, a Co-N bond with high catalytic activity can be formed in situ, and the carbon matrix with a hierarchical pore structure and the Co nanocluster are combined to be used as the positive electrode material of the potassium-sulfur battery, so that the electrochemical performance of the potassium-sulfur battery can be remarkably improved.

Description

technical field [0001] The invention relates to a preparation method of an N-doped Co nanocluster / N-doped porous carbon / S composite material used for a positive electrode of a high-performance potassium-sulfur battery, and belongs to the technical field of potassium-sulfur batteries. Background technique [0002] At present, lithium-ion batteries occupy a major position in energy storage devices, but the shortage of lithium resources limits the long-term development of lithium batteries. Therefore, researchers focus on the design and application of new batteries, mainly focusing on sodium-ion batteries, potassium-ion batteries and aluminum batteries. ion battery. Among them, potassium is rich in the earth's crust, low in cost, and its standard potential is closer to lithium, which can achieve higher battery voltage and increase battery energy density; in addition, K + The Lewis acidity of Li is weaker and can form smaller solvated ions, and the ionic conductivity and the nu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/054
CPCH01M4/362H01M4/38H01M4/62H01M4/625H01M4/628H01M10/054Y02E60/10
Inventor 尹龙卫葛晓丽张志薇王朋张鹏苗显光王慧洋
Owner SHANDONG UNIV
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