A method for preparing carbon-coated zinc sulfide-supported graphene as negative electrode of potassium ion battery

A battery negative electrode and zinc sulfide technology, applied in the field of functional nanomaterials and electrochemistry, to achieve excellent cycle performance and capacity performance, mild reaction conditions, and ultra-high specific surface area

Active Publication Date: 2019-01-18
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

According to literature research, there is no report on carbon fully-coated dendritic zinc sulfide microspheres loaded with graphene composite materials

Method used

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  • A method for preparing carbon-coated zinc sulfide-supported graphene as negative electrode of potassium ion battery
  • A method for preparing carbon-coated zinc sulfide-supported graphene as negative electrode of potassium ion battery
  • A method for preparing carbon-coated zinc sulfide-supported graphene as negative electrode of potassium ion battery

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Experimental program
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Effect test

Embodiment 1

[0029] Dissolve 2.43g of zinc nitrate hexahydrate and 1.578g of 2-methylimidazole in 50ml of methanol respectively to form a mixed solution, and stir magnetically for 10min. During the stirring process, the methanol solution of 2-methylimidazole was added dropwise to the methanol solution of zinc nitrate hexahydrate, after the dropwise addition was completed, the mixture was stirred vigorously for 20 minutes, and the mixture was aged at room temperature for 24 hours. After washing and drying, the polyhedral precursor ZIF-8 of zinc was obtained. Then take 30mg of ZIF-8 powder and 10ml of methanol in aqueous solution to form a mixed solution, gradually add 30mg of cysteine, 25mg of urea and 120mg of glucose, stir for a period of time, then transfer the mixed solution to a high-pressure reactor, set the temperature to 120 ℃, the time is 24 hours, after the reaction is completed, cool to room temperature and centrifuge to wash, and vacuum-dry to obtain carbon fully-coated dendriti...

Embodiment 2

[0031]Dissolve 2.43g of zinc nitrate hexahydrate and 1.578g of 2-methylimidazole in 50ml of methanol to form a mixed solution, and stir magnetically for 10min. During the stirring process, the methanol solution of 2-methylimidazole was added dropwise to the methanol solution of zinc nitrate hexahydrate, after the dropwise addition was completed, the mixture was stirred vigorously for 20 minutes, and the mixture was aged at room temperature for 24 hours. After washing and drying, the polyhedral precursor ZIF-8 of zinc was obtained. Then take 30mg of ZIF-8 powder and 10ml of methanol in aqueous solution to form a mixed solution, gradually add 30mg of cysteine, 25mg of urea and 120mg of glucose, stir for a period of time, then transfer the mixed solution to a high-pressure reactor, set the temperature to 120 ℃, the time is 12h, after the reaction is completed, cool to room temperature, centrifuge and dry, and vacuum-dry to obtain dendritic zinc sulfide microspheres fully coated w...

Embodiment 3

[0033] Dissolve 2.43g of zinc nitrate hexahydrate and 1.578g of 2-methylimidazole in 50ml of methanol to form a mixed solution, and stir magnetically for 10min. During the stirring process, the methanol solution of 2-methylimidazole was added dropwise to the methanol solution of zinc nitrate hexahydrate, after the dropwise addition was completed, the mixture was stirred vigorously for 20 minutes, and the mixture was aged at room temperature for 24 hours. After washing and drying, the polyhedral precursor ZIF-8 of zinc was obtained. Then take 30mg of ZIF-8 powder and 10ml of methanol in aqueous solution to form a mixed solution, gradually add 30mg of cysteine, 25mg of urea and 120mg of glucose, stir for a period of time, then transfer the mixed solution to a high-pressure reactor, set the temperature to 120 ℃, the time is 48h, after the reaction is completed, cool to room temperature, centrifuge and dry, and vacuum-dry to obtain carbon fully-coated dendritic zinc sulfide micros...

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Abstract

A method for preparing carbon-coated zinc sulfide-supported graphene as negative electrode of potassium ion battery belongs to that field of functional nanometer material and electrochemistry. The methanol solution of 2-methimidazole is added dropwise into the methanol solution of zinc nitrate hexahydrate, stirred for a period of time, aged, centrifuged, washed and dried to obtain a ZIF-8 precursor. And then ZIF-8 power and methanol are mixed into solution, adding cysteine, urea and glucose step by step, stirring, transferring to a high-pressure reaction kettle, setting that temperature at 120DEG C and the time is 6-48h, centrifugally cleaning and vacuum drying. Finally, the powders were mixed with the aqueous solution of graphene oxide and dried centrifugally, and then transferred to a tubular furnace for heating and heat preservation in an inert protective atmosphere to obtain carbon fully coated zinc sulfide loaded graphene composites. The negative electrode material of the potassium ion battery prepared by the invention has strong repeatability, simple requirements on the experimental equipment, large specific surface area, high reversible capacity, excellent rate performanceand the like, and has wide application prospects in the fields of catalysis and energy storage.

Description

technical field [0001] The invention specifically relates to a method for preparing a carbon fully-coated dendritic zinc sulfide microsphere-loaded graphene composite material (ZnS / C@C@RGO) as a negative electrode of a potassium ion battery, which belongs to the field of functional nanomaterials and electrochemistry. Background technique [0002] Since the 21st century, lithium-ion batteries have become a part of our lives. Lithium-ion battery portable devices and powered vehicles have been found in every corner of life. However, lithium is known as a "rare metal", and its content in the earth's crust is only about 0.0065%. The scarce lithium resources will make the cost of lithium-ion batteries continue to rise in the future. From the perspective of reducing material costs, it is very important to develop new energy storage systems that can replace lithium-ion batteries. As sodium and potassium elements of the same family as lithium, sodium-ion batteries and potassium-ion...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/583H01M10/054
CPCH01M4/366H01M4/5815H01M4/583H01M10/054Y02E60/10
Inventor 包燕平储建华王伟王敏邢立东
Owner UNIV OF SCI & TECH BEIJING
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