Cobalt diselenide@porous nitrogen-doped carbon nano composite material, potassium ion battery and preparation method thereof

A nanocomposite material, cobalt diselenide technology, which is applied in the field of electrode materials for potassium-ion secondary batteries, can solve the problems of synthesis methods and performance differences, and achieve the effects of simple methods, alleviating volume expansion, and improving Coulombic efficiency

Active Publication Date: 2021-09-17
SOUTH CHINA UNIV OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although there have been reports on the synthesis of cobalt diselenide materials before, their synthesis methods and properties are different from those of the present invent

Method used

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  • Cobalt diselenide@porous nitrogen-doped carbon nano composite material, potassium ion battery and preparation method thereof
  • Cobalt diselenide@porous nitrogen-doped carbon nano composite material, potassium ion battery and preparation method thereof
  • Cobalt diselenide@porous nitrogen-doped carbon nano composite material, potassium ion battery and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] Quickly inject 2 mL of an aqueous solution containing 58 mg of cobalt nitrate and 1 mg of cetyltrimethylammonium bromide (CTAB) into 14 mL of an aqueous solution containing 908 mg of 2-methylimidazole, and stir vigorously at room temperature for 20 min, then wash the precipitate repeatedly with ethanol At least 6 times, and then vacuum-dried overnight at room temperature to obtain purple ZIF-67 nanocubes; ZIF-67 was calcined for 1 h at a rate of 1 °C / min to 650 °C under an argon atmosphere to obtain a black powder called cobalt@porous Nitrogen-doped carbon; Cobalt@porous nitrogen-doped carbon and selenium powder were placed in two porcelain boats at a mass ratio of 1:10, and the selenium powder porcelain boat was placed upstream of the tube furnace. Under selenization for 3 hours, cobalt diselenide@porous nitrogen-doped carbon nanocubes were obtained;

[0045] figure 1 It is the SEM image of the cobalt diselenide@porous nitrogen-doped carbon nanomaterial prepared in th...

Embodiment 2

[0052] Quickly inject 2 mL of an aqueous solution containing 58 mg of cobalt sulfate and 1 mg of cetyltrimethylammonium bromide (CTAB) into 14 mL of an aqueous solution containing 908 mg of 2-methylimidazole, and stir vigorously at room temperature for 20 minutes, then wash the precipitate repeatedly with ethanol At least 6 times, and then vacuum-dried overnight at room temperature to obtain purple ZIF-67 nanocubes; ZIF-67 was calcined for 1 h at a rate of 2 °C / min to 750 °C under an argon atmosphere to obtain a black powder called cobalt@porous Nitrogen-doped carbon; Cobalt@porous nitrogen-doped carbon and selenium powder were placed in two porcelain boats at a mass ratio of 1:10, and the selenium powder porcelain boat was placed upstream of the tube furnace. Under selenization for 3 hours, cobalt diselenide@porous nitrogen-doped carbon nanocubes were obtained;

[0053] Weigh 0.4g of cobalt diselenide@porous nitrogen-doped carbon nanomaterial prepared above, 0.05g of acetylen...

Embodiment 3

[0055] Quickly inject 2 mL of an aqueous solution containing 58 mg of cobalt chloride and 1 mg of cetyltrimethylammonium bromide (CTAB) into 14 mL of an aqueous solution containing 908 mg of 2-methylimidazole, stir vigorously at room temperature for 20 min, and then wash repeatedly with ethanol Precipitate at least 6 times, and then dry overnight at room temperature under vacuum to obtain purple ZIF-67 nanocubes; ZIF-67 was calcined for 1 h at a rate of 3 °C / min to 750 °C under an argon atmosphere to obtain a black powder of cobalt@ Porous nitrogen-doped carbon; put cobalt@porous nitrogen-doped carbon and selenium powder in two porcelain boats at a mass ratio of 1:10, and place the selenium powder porcelain boat in the upstream of the tube furnace. Selenization at ℃ for 3 hours to obtain cobalt diselenide@porous nitrogen-doped carbon nanocubes;

[0056] Weigh 0.4g of cobalt diselenide@porous nitrogen-doped carbon nanomaterial prepared above, 0.05g of acetylene black (conductiv...

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Abstract

The invention discloses a cobalt diselenide@porous nitrogen-doped carbon nano composite material, a potassium ion battery and a preparation method thereof. The composite material comprises cobalt diselenide particles and porous nitrogen-doped carbon, and the cobalt diselenide particles are limited on a carbon shell of the porous nitrogen-doped carbon. A cobalt-based metal frame ZIF-67 is firstly carbonized and then selenized in a high-temperature inert atmosphere, and the cobalt diselenide@porous nitrogen-doped carbon nano composite material is obtained. The preparation method of the negative electrode material is simple and easy to operate, the raw materials are easy to obtain, the repeatability is good, the problems that active substances are pulverized and fall off from a current collector due to large volume fluctuation of a transition metal sulfide negative electrode in the charging and discharging process are successfully solved, and through optimal matching with an electrolyte, a potassium ion battery system which is higher in capacity, stable in circulation and better in rate capability is finally constructed.

Description

technical field [0001] The invention belongs to the field of electrode materials for potassium-ion secondary batteries, and in particular relates to a cobalt diselenide@porous nitrogen-doped carbon nanocomposite material, a potassium-ion battery and a preparation method thereof. Background technique [0002] In today's increasingly serious environmental pollution and energy crisis, the market demand for renewable energy and its corresponding high-efficiency energy storage equipment is increasing. Although lithium-ion batteries have been widely used in industry, due to the shortage of lithium resources and the uneven distribution in the world, considering the similarity, the same family of sodium and potassium are ideal alternative metals. Sodium and potassium are abundant on the earth (lithium: 0.0017wt%; sodium: 2.36wt%; potassium: 2.09wt%), and the price is much lower than lithium. Compared with sodium-ion batteries, potassium-ion batteries have a similar redox potential ...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M10/054C01B32/15C01B19/04B82Y30/00
CPCH01M4/366H01M4/581H01M4/628H01M4/625H01M10/054C01B32/15C01B19/007B82Y30/00C01P2004/80C01P2006/40C01P2004/03C01P2002/72C01P2002/88Y02E60/10
Inventor 杨成浩黄倩晖吴理觉汪华
Owner SOUTH CHINA UNIV OF TECH
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