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Hollow carbon shell inlaid with metal sulfide, preparation method and application thereof

A technology of inlaid metal and sulfide, applied in structural parts, electrical components, battery electrodes, etc., can solve problems such as poor stable charge and discharge performance, and achieve the effects of easy operation, maintaining structural stability, and improving electrochemical performance.

Pending Publication Date: 2021-12-17
XIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to overcome the disadvantages of the single-component transition metal sulfide used as electrode materials in the above-mentioned prior art, which have poor stability and high-rate charge-discharge performance, and provide a hollow carbon shell inlaid with metal sulfide And its preparation method and application

Method used

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  • Hollow carbon shell inlaid with metal sulfide, preparation method and application thereof
  • Hollow carbon shell inlaid with metal sulfide, preparation method and application thereof
  • Hollow carbon shell inlaid with metal sulfide, preparation method and application thereof

Examples

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Embodiment 1

[0042] A method for preparing a hollow carbon shell embedded with metal sulfides, comprising the steps of:

[0043]Step 1) Accurately weigh 1.1g (4mmol) of cobalt nitrate hexahydrate and 1.3g (16mmol) of 2-methylimidazole, dissolve them in 100mL of methanol and stir until completely dissolved. The ligand 2-methylimidazole solution was quickly poured into the cobalt nitrate solution under vigorous stirring, and it was observed that the solution quickly turned purple, and the solution was stirred by magnetic force for 30 minutes and then left to stand overnight. After 24 hours, it was suction filtered and washed three times with absolute ethanol, and the collected purple precipitate was dried at 50° C. for 12 hours to obtain ZIF-67.

[0044] Step 2) Weigh 50 mg of ZIF-67 prepared in step 1) and add it to 12 mL of ethanol, and sonicate for 30 min until it is completely dispersed. Then, 56mg of thioacetamide was dissolved in 4mL of ethanol and added to the above solution and kept...

Embodiment 2

[0047] A method for preparing a hollow carbon shell embedded with metal sulfides, comprising the steps of:

[0048] Step 1) Accurately weigh 0.58g (2mmol) of cobalt nitrate hexahydrate and 0.66g (8mmol) of 2-methylimidazole, dissolve them in 105.5mL of methanol and stir until completely dissolved. The ligand 2-methylimidazole solution was quickly poured into the cobalt nitrate solution under vigorous stirring, and it was observed that the solution quickly turned purple, and the solution was stirred by magnetic force for 30 minutes and then left to stand overnight. After 12 hours, it was suction filtered and washed three times with absolute ethanol, and the collected purple precipitate was dried at 50° C. for 24 hours to obtain ZIF-67.

[0049] Step 2) Weigh 25 mg of ZIF-67 and add it to 6 mL of ethanol, sonicate for 30 min until it is completely dispersed. Then, 30 mg of thioacetamide was dissolved in 2 mL of ethanol and added to the above solution, and the stirring was conti...

Embodiment 3

[0052] A method for preparing a hollow carbon shell embedded with metal sulfides, comprising the steps of:

[0053] Step 1) Accurately weigh 0.87g (3mmol) of cobalt nitrate hexahydrate and 0.493g (6mmol) of 2-methylimidazole, dissolve them in 80mL of methanol and stir until completely dissolved. The ligand 2-methylimidazole solution was quickly poured into the cobalt nitrate solution under vigorous stirring, and it was observed that the solution quickly turned purple, and the solution was stirred by magnetic force for 30 minutes and then left to stand overnight. After 24 hours, it was suction filtered and washed three times with absolute ethanol, and the collected purple precipitate was dried at 80° C. for 12 hours to obtain ZIF-67.

[0054] Step 2) Weigh 38 mg of ZIF-67 prepared in step 1) and add it to 10 mL of ethanol, and sonicate for 30 min until it is completely dispersed. Then, 44mg of thioacetamide was dissolved in 5mL of ethanol and added to the above solution and ke...

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Abstract

The invention discloses a hollow carbon shell inlaid with metal sulfide, a preparation method and application thereof, and belongs to the technical field of preparation of lithium-sulfur battery positive electrode materials, wherein a hollow carbon shell polyhedral material inlaid with polar metal sulfide is prepared by taking MOFs as a precursor and performing simple vulcanization and heat treatment. According to the invention, the preparation method is easy to operate, required instruments and equipment are simple, a ZIF-67 precursor template with uniform morphology is prepared by adopting a precipitation method with a mature process, and by using a simple vulcanization process, a hollow structure can be formed due to non-uniform shrinkage in a heat treatment process; and due to the fact that chemical adsorption can be generated on polysulfide, the shuttle effect in the charging and discharging process can be restrained to a certain degree, loss of the active substance sulfur is reduced, the hollow structure can buffer the volume change of sulfur in the electrochemical reaction process, so that the electrochemical performance of the battery can be improved, and the hollow carbon shell can be applied to positive electrode sulfur carriers of lithium-sulfur batteries.

Description

technical field [0001] The invention belongs to the technical field of preparation of cathode materials for lithium-sulfur batteries, and relates to a hollow carbon shell inlaid with metal sulfides, a preparation method and application thereof. Background technique [0002] The focus of this century is energy and environmental issues. Energy is the pillar of the social economy, one of the important foundations for human survival and progress, and plays an essential role in promoting economic development. With the rapid development of social economy, energy consumption has increased dramatically. The traditional fossil energy reserves on the earth are limited, and the consumption of fossil fuels will cause environmental problems, so there is an urgent need to develop and utilize clean and renewable energy. [0003] To meet this demand, advanced energy storage and conversion technologies must be explored, such as lithium-ion batteries, lithium-sulfur batteries, supercapacito...

Claims

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Application Information

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IPC IPC(8): H01M4/58H01M4/62
CPCH01M4/625H01M4/5815Y02E60/10
Inventor 杨蓉杨云樊潮江燕映霖邹一鸣
Owner XIAN UNIV OF TECH
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