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A kind of cobalt sulfide nano sheet material and preparation method thereof

A technology of cobalt sulfide and nanosheets, applied in the field of electrochemistry, to achieve short reaction time, improve charge and discharge, and reduce migration distance

Active Publication Date: 2021-02-19
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, its more applications are in photoelectric catalysis, and the effect is good. In electrochemical research, it is more based on the research on lithium-ion batteries, and there are fewer studies on sodium-ion batteries.

Method used

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  • A kind of cobalt sulfide nano sheet material and preparation method thereof
  • A kind of cobalt sulfide nano sheet material and preparation method thereof

Examples

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Comparison scheme
Effect test

Embodiment 1

[0047] Step 1: Take 2.0g of cobalt acetate tetrahydrate and add it to 20mL of ethylene glycol and 10mL of isopropanol mixed solution, put the above three raw materials into a beaker, and stir for 35min with magnetic stirring at a speed of 730r / min to obtain a solution A;

[0048] Step 2: Dissolve 1.0g of sodium sulfide in 30mL of deionized water, stir until the solution is clear, then add ammonia solution dropwise to the solution at a rate of 0.16mL / min, after adding one drop of ammonia solution, stir until the pH of the solution Stable, then drop the next drop of ammonia solution until the pH value of the solution is adjusted to 11.5 to obtain solution B;

[0049] Step 3: Mix the above solution B and solution A, and disperse by ultrasonic for 85 minutes; pour the mixed solution into the homogeneous hydrothermal reaction kettle according to the filling ratio of 55% and seal it, and put the inner kettle in the outer kettle and fix it Placed in a homogeneous reactor, heated fro...

Embodiment 2

[0055] Step 1: Add 1.5g of cobalt acetate tetrahydrate into 16mL of ethylene glycol and 9mL of isopropanol mixed solution, put the above three raw materials into a beaker, and stir for 30min at a speed of 700r / min using magnetic stirring to obtain a solution A;

[0056] Step 2: Dissolve 0.7g of sodium sulfide in 35mL of deionized water, stir until the solution is clear, then add ammonia solution dropwise to the solution at a rate of 0.15mL / min, after adding one drop of ammonia solution, stir until the pH of the solution Stable, then drop the next drop of ammonia solution until the pH value of the solution is adjusted to 11.2 to obtain solution B;

[0057] Step 3: Mix the above solution B and solution A, and disperse by ultrasonic for 80 minutes; pour the mixed solution into the homogeneous hydrothermal reaction kettle according to the filling ratio of 50% and seal it, and put the inner kettle in the outer kettle and fix it Place it in a homogeneous reactor, heat it from room ...

Embodiment 3

[0061] Step 1: Take 2.2g of cobalt acetate tetrahydrate and add it to 24mL of ethylene glycol and 11mL of isopropanol mixed solution, put the above three raw materials into a beaker, and use magnetic stirring to stir for 40min at a speed of 750r / min to obtain a solution A;

[0062] Step 2: Dissolve 1.2g of sodium sulfide in 50mL of deionized water, stir until the solution is clear, then add ammonia solution dropwise to the solution at a rate of 0.18mL / min, after adding one drop of ammonia solution, stir until the pH of the solution Stable, then drop the next drop of ammonia solution until the pH value of the solution is adjusted to 11.8 to obtain solution B;

[0063] Step 3: Mix the above solution B and solution A, and disperse by ultrasonic for 90 minutes; pour the mixed solution into a homogeneous hydrothermal reaction kettle with a filling ratio of 60% and seal it, and put the inner kettle in the outer kettle and fix it Placed in a homogeneous reactor, heated from room tem...

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Abstract

A cobalt sulfide nanosheet material and a preparation method thereof, comprising adding cobalt acetate tetrahydrate into a mixed solution of isopropanol and ethylene glycol, and stirring magnetically to obtain solution A; adding sodium sulfide to deionized water, and then adding ammonia water to obtain Solution B; mix solution A and solution B uniformly and then pour into a homogeneous hydrothermal reaction kettle for reaction; then take out the cooled product after the reaction, wash and freeze-dry to obtain cobalt sulfide nanosheet material. The raw materials used in the present invention are easy to obtain and are environmentally friendly, the experimental reaction conditions are simple, and the safety is high. By adjusting the pH value of the solution, the particle size of the product is smaller, and the active sites of the redox reaction during cobalt sulfide intercalation and desorption of sodium are increased, thereby improving the efficiency of the battery. cycle stability.

Description

technical field [0001] The invention relates to a cobalt sulfide nanosheet material and a preparation method thereof, which are applied to negative electrode materials of sodium ion batteries and belong to the field of electrochemistry. Background technique [0002] Transition metal sulfides (such as: NiS, CoS, MnS, ZnS, SnS, etc.) have received widespread attention in the fields of supercapacitors, secondary batteries, and photocatalysis in recent years. Because sulfides have the advantages of complex structure and unique bonding mode, transition metal sulfides show potential use value in the field of new materials. In the process of electrochemical research, sulfides such as nickel, tungsten, and cobalt are good negative electrode materials for secondary batteries, because these sulfides have a layered structure and the interlayer distance is relatively large. In, Li + and Na + Can be easily embedded in the layered structure. [0003] In cobalt sulfide, Co and S have a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G51/00B82Y40/00
CPCB82Y40/00C01G51/30C01P2002/72C01P2004/03C01P2004/22
Inventor 黄剑锋何枢薇李文斌曹丽云畅珣伟王娜范海鑫白明玥
Owner SHAANXI UNIV OF SCI & TECH
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