Arachnoid cobalt sulfide powder and preparation method thereof

A technology of cobalt sulfide and cobwebs, which is applied in cobalt sulfide, chemical instruments and methods, inorganic chemistry, etc., to achieve the effect of simple synthesis path, stable stability and low synthesis temperature

Active Publication Date: 2020-02-11
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The application prospect of cobalt sulfide in potassium-ion batteries is very broad, and it has received extensive attention from the majority of

Method used

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  • Arachnoid cobalt sulfide powder and preparation method thereof
  • Arachnoid cobalt sulfide powder and preparation method thereof
  • Arachnoid cobalt sulfide powder and preparation method thereof

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preparation example Construction

[0025] A kind of cobweb-like Co of the present invention 9 S 8 The preparation method of powder comprises the following steps:

[0026] Step 1, dissolve cobalt acetate tetrahydrate in ethanol, and uniformly prepare solution A by magnetic stirring, and Co in solution A 2+ The concentration is 0.08~0.15mol / L; dissolve thioacetamide in an equivalent amount of ethanol, and obtain solution B by magnetic stirring; wherein, the molar ratio of cobalt acetate tetrahydrate to thioacetamide is 1: (0.8-1.5), The speed of magnetic stirring is 700~750r / min, and the time is 15~30min

[0027] Step 2, pour solution B into solution A, and obtain solution C by stirring evenly, at this time, solution C is a pink clear solution;

[0028] Step 3: Pour the solution C into a polytetrafluoroethylene-lined reaction kettle with a filling degree of 40% to 60%, and in a homogeneous reactor with a rotation speed of 10 to 15r / min at a uniform speed, from room temperature to Heating to 150-170°C for solv...

Embodiment 1

[0032] A kind of cobweb-like Co of the present invention 9 S 8 The preparation method of powder comprises the following steps:

[0033] Step 1, dissolve cobalt acetate tetrahydrate in ethanol, stir magnetically for 15min at a speed of 700r / min, and prepare Co 2+ For solution A with a concentration of 0.08mol / L, the molar ratio of cobalt acetate tetrahydrate to thioacetamide is 1:0.8, and thioacetamide is dissolved in the same amount of ethanol as the first time, at a speed of 700r / min , magnetically stirred for 15 minutes to obtain solution B;

[0034] Step 2, pour solution B into solution A, and obtain a clear pink solution C by stirring evenly;

[0035] Step 3, according to the filling ratio of 40%, pour the mixed solution into the reaction liner and seal it, install the liner in the outer kettle and fix it, place it in a homogeneous reactor, and heat it from room temperature to 150 °C at 10 r / min. ℃ for solvothermal reaction 20h;

[0036] Step 4, after the solvothermal...

Embodiment 2

[0041] A kind of cobweb-like Co of the present invention 9 S 8 The preparation method of powder comprises the following steps:

[0042] Step 1, dissolve cobalt acetate tetrahydrate in ethanol, stir magnetically for 20min at a speed of 720r / min, and prepare Co 2+For solution A with a concentration of 0.12mol / L, the molar ratio of cobalt acetate tetrahydrate to thioacetamide is 1:1, and thioacetamide is dissolved in the same amount of ethanol as the first time, at a speed of 720r / min , magnetically stirred for 20min to obtain solution B;

[0043] Step 2, pour solution B into solution A, and obtain a clear pink solution C by stirring evenly;

[0044] Step 3, according to the filling ratio of 50%, pour the mixed solution into the reaction liner and seal it, install the liner in the outer kettle and fix it, place it in a homogeneous reactor, and heat it from room temperature to 170 °C under the condition of 12 r / min speed. ℃ for solvothermal reaction for 23h;

[0045] Step 4, ...

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Abstract

The invention relates to an arachnoid cobalt sulfide powder and a preparation method thereof. The method comprises the following steps: 1, carrying out a solvothermal reaction on cobalt acetate and thioacetamide at 150-170 DEG C to obtain a reaction solution A; and 2, washing and drying a product in the reaction solution A to obtain the arachnoid cobalt sulfide powder. The final product is directly synthesized from the cobalt acetate and thioacetamide by adopting the one-step solvothermal reaction, the particle size of the product is in the nanoscale, the product has a large specific surface area, and the formed pores provide a buffer area for volume expansion generated in the charging/discharging process, so the material has a stable stability, and has excellent performances when used asa potassium ion battery negative electrode material; and the preparation method has the advantages of low synthesis temperature, simple synthesis path, no large instruments or harsh reaction conditions, and suitableness for large-scale production.

Description

technical field [0001] The invention belongs to the field of negative electrode materials for potassium ion batteries, in particular to a cobweb-shaped cobalt sulfide powder and a preparation method thereof. Background technique [0002] Based on the problem of environmental pollution, people's awareness of environmental protection and the concern about the reuse rate of resources are gradually increasing, and rechargeable batteries have become the focus of research and attention of scientists. The sodium element in the earth's crust has a large amount of reserves on a global scale and is easy to obtain, which also makes the raw material cost of potassium-ion batteries lower than that of lithium-ion batteries. In order to realize the sustainable development of the battery industry, it is a top priority to develop new energy storage batteries that are pollution-free and environmentally friendly. Potassium-ion batteries are one of the above-mentioned new high-energy green batt...

Claims

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Application Information

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IPC IPC(8): C01G51/00
CPCC01G51/30C01P2004/30C01P2002/72C01P2004/03C01P2006/40
Inventor 黄剑锋何枢薇李嘉胤曹丽云郭玲张晓王芳敏
Owner SHAANXI UNIV OF SCI & TECH
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