Carbon-coated nickel sulfide electrode material and preparation method and application thereof

An electrode material, a technology of nickel sulfide, applied in the field of carbon-coated nickel sulfide electrode materials and its preparation, can solve the problems of poor reversible capacity and rate performance, inability to guarantee structure and electrochemical stability, poor conductivity, etc., and achieve charging and discharging Good capacity and rate performance, high reproducibility, and the effect of improving conductivity

Active Publication Date: 2020-12-01
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, sodium ions have poor reversible capacity and rate performance in batteries, poor conductivity of sodium ion anode materials, and rapid changes in the volume of buffer materials during the process of sodium ion intercalation, which cannot guarantee its structure and electrochemical stability.

Method used

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  • Carbon-coated nickel sulfide electrode material and preparation method and application thereof
  • Carbon-coated nickel sulfide electrode material and preparation method and application thereof
  • Carbon-coated nickel sulfide electrode material and preparation method and application thereof

Examples

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preparation example Construction

[0023] One aspect of the present invention provides a method for preparing a carbon-coated nickel sulfide electrode material. In an exemplary embodiment of the preparation method of the carbon-coated nickel sulfide electrode material of the present invention, the preparation method may include:

[0024] S01, prepare ethylene glycol aqueous solution. Measure a predetermined amount of ethylene glycol solution and disperse it in deionized water, and stir evenly to obtain an ethylene glycol aqueous solution. The volume of ethylene glycol and aqueous solution can be mixed according to the ratio of 1:(0.75~1.25), for example, it can be mixed according to the volume ratio of 1:1. The amount of ethylene glycol added can be determined according to the sulfur source added, the amount of sulfur source and glucose used. For example, it is sufficient that the added nickel source, sulfur source and glucose can be completely dissolved. Of course, ethylene glycol can also be added in exces...

example 1

[0041] Step 1, measure 40 mL of ethylene glycol solution and disperse it in 40 mL of deionized water, stir until uniform to form a uniform mixed solution.

[0042] Step 2, slowly add 1.5 g of glucose to the solution obtained in Step 1, and stir until completely dissolved.

[0043] Step 3, slowly add 2 mmol of nickel acetate tetrahydrate (C 4 h 6 o 4 Ni·4H 2 O) Powder, magnetically stirred until completely dissolved; then 6 mmol of Na was added at a rate of 0.4 g / min 2 S 2 o 3 ·5H 2 O, stir magnetically until completely dissolved. The resulting solution was placed in a high-pressure reactor, heated in an oven at 180°C for 10 hours, and the resulting product was repeatedly washed and centrifuged with deionized water and absolute ethanol until it was clean, and finally dried in a vacuum oven to obtain NiS 2 Material. The resulting product was placed in a tube furnace N 2 In the atmosphere, calcined at 600 ° C for 4 hours to obtain a similar NiS / C (carbon-coated nickel s...

example 2

[0058] Step 1, measure 30 mL of ethylene glycol solution and disperse it in 50 mL of deionized water, stir until uniform to form a uniform mixed solution.

[0059] Step 2, slowly add 0.5 g of glucose to the solution obtained in Step 1, and stir until completely dissolved.

[0060] Step 3, slowly add 2 mmol of nickel acetate tetrahydrate (C 4 h 6 o 4 Ni·4H 2 O) powder, stirred magnetically until completely dissolved; then added 6 mmol of Na 2 S 2 o 3 ·5H 2 O, stir magnetically until completely dissolved. The resulting solution was placed in a high-pressure reactor, heated in an oven at 200°C for 24 hours, and the resulting product was repeatedly washed and centrifuged with deionized water and absolute ethanol until it was clean, and finally dried in a vacuum oven to obtain NiS 2 Material. The obtained product was placed in an Ar atmosphere in a tube furnace, and calcined at 500 ° C for 1 hour to obtain a similar NiS / C electrode material, and its XRD pattern is as follo...

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Abstract

The invention provides a carbon-coated nickel sulfide electrode material and a preparation method and application thereof. The preparation method comprises: preparing an ethylene glycol aqueous solution; adding glucose into the ethylene glycol aqueous solution until glucose is completely dissolved to obtain an ethylene glycol-glucose mixed solution; sequentially adding a nickel source and a sulfursource into the ethylene glycol-glucose mixed solution until the nickel source and the sulfur source are completely dissolved, and carrying out hydrothermal reaction until the reaction is finished toobtain a hydrothermal reaction product; and carrying out solid-liquid separation on the hydrothermal reaction product, washing and drying the obtained solid isolate, and calcining in a protective atmosphere to obtain the carbon-coated nickel sulfide electrode material. The preparation method of the carbon-coated nickel sulfide electrode material is simple, the material is easy to obtain, the reproducibility is high, no pollution is caused, the product structure is easy to control, the material reaches the nanoscale size, and industrial application and popularization are easy to achieve.

Description

technical field [0001] The invention relates to the technical field of battery materials, in particular to a carbon-coated nickel sulfide electrode material and a preparation method and application thereof. Background technique [0002] With the rapid growth of population and rapid economic development, the energy problem has become one of the major problems that limit the development and progress of human society. Electrochemical energy storage and electrochemical conversion systems with high comprehensive performance, such as lithium-ion batteries, sodium-ion batteries, hybrid supercapacitors, metal-air batteries, and photocatalytic water splitting, have become advanced technologies to solve global energy problems. Therefore, the development of energy storage devices with high energy density, high power density, long life and low cost is the main development direction of new energy in the future. [0003] Lithium-ion batteries are more and more used in mobile phones, lapt...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M10/054B82Y30/00B82Y40/00
CPCH01M4/366H01M4/5815H01M4/62H01M4/625H01M4/628H01M10/054B82Y30/00B82Y40/00Y02E60/10
Inventor 王丁夏广辉张英杰段建国董鹏张义永李雪豹
Owner KUNMING UNIV OF SCI & TECH
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