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A kind of double metal selenide material wrapped in graphene and its preparation method and application

A graphene-wrapped, bimetallic technology, applied in active material electrodes, electrochemical generators, structural parts, etc., can solve the problems of poor battery cycle and rate performance, poor cycle stability, slow diffusion kinetics, etc., and achieve cycle performance. Stable, uniform particle size, and the effect of alleviating structural collapse

Active Publication Date: 2022-06-21
SOUTH CHINA UNIV OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Although anode materials for sodium-ion batteries have attracted the attention of many researchers and have many advantages, there are still serious problems as follows: due to the + Ions have larger ionic radii and slower diffusion kinetics, resulting in poor cycle and rate performance of the battery
However, their low rate capability is due to their generally poor conductivity
In addition, they have large volume changes during continuous discharge / charge, resulting in poor cycle stability

Method used

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  • A kind of double metal selenide material wrapped in graphene and its preparation method and application
  • A kind of double metal selenide material wrapped in graphene and its preparation method and application
  • A kind of double metal selenide material wrapped in graphene and its preparation method and application

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Embodiment 1

[0040] The present embodiment provides a preparation method of a graphene-wrapped bimetallic selenide material, comprising the following steps:

[0041] (1) 432 mg of nickel nitrate hexahydrate (Ni(NO) 3 ) 2 •6H 2 O) and 432 mg of cobalt nitrate hexahydrate (Co(NO) 3 ) 2 •6H 2 O), 300 mg trimesic acid and 3 g polyvinylpyrrolidone (PVP) were dissolved in 60 mL (1:1:1 volume ratio of ethanol, water, N,N-dimethylformamide) mixed solvent Stir for about 30 min to obtain a mixed solution, then transfer the mixed solution to a 100 mL autoclave, put the autoclave in an oven, and heat to 150 o C, incubated for 10 h, the final product was centrifuged at 10,000 rpm for 2 min, washed 5 times with water and ethanol, and finally dried in an oven at 80 °C for 12 h to obtain the reaction product NiCo-MOF-1;

[0042](2) 200 mg of NiCo-MOF-1 and 400 mg of selenium powder were mixed and ground evenly and then placed in a quartz magnetic boat for selenization and carbonization treatment. T...

Embodiment 2

[0054] (1) 864 mg of nickel nitrate hexahydrate (Ni(NO 3 ) 2 •6H 2 O) and 432 mg of cobalt nitrate hexahydrate (Co(NO) 3 ) 2 •6H 2 O), 285 mg trimesic acid and 3 g polyvinylpyrrolidone (PVP) were dissolved in 60 mL (1:1:1 volume ratio of ethanol, water, N,N-dimethylformamide) mixed solvent Stir for about 30 min to obtain a mixed solution, then transfer the mixed solution to a 100 mL autoclave, put the autoclave into an oven, and heat it to 120 o C, incubated for 12 h, the final product was centrifuged at 10,000 rpm for 2 min, washed 5 times with water and ethanol, and finally dried in an oven at 80 °C for 12 h to obtain the reaction product NiCo-MOF-2;

[0055] (2) 200 mg of NiCo-MOF-2 and 600 mg of selenium powder were mixed and ground evenly, and then placed in a quartz magnetic boat for selenization and carbonization treatment. The condition is to start with 2 o C / min rate ramp up to 550 o C, hold for 12h under argon atmosphere, wait until cooled to room temperature...

Embodiment 3

[0059] (1) 432 mg of nickel nitrate hexahydrate (Ni(NO) 3 ) 2 •6H 2 O) and 864 mg of cobalt nitrate hexahydrate (Co(NO) 3 ) 2 •6H 2 O), 522 mg trimesic acid and 3 g polyvinylpyrrolidone (PVP) were dissolved in 60 mL (1:1:1 volume ratio of ethanol, water, N,N-dimethylformamide) mixed solvent Stir for about 30 min to obtain a mixed solution, then transfer the mixed solution to a 100 mL autoclave, put the autoclave in an oven, and heat to 180 o C, incubated for 3 h, the final product was centrifuged at 10,000 rpm for 2 min, washed 5 times with water and ethanol, and finally dried in an oven at 80 °C for 12 h to obtain the reaction product NiCo-MOF-3;

[0060] (2) 200 mg NiCo-MOF-3 and 800 mg selenium powder were mixed and ground evenly, and then placed in a quartz magnetic boat for selenization and carbonization treatment. The condition is to start with 2 o C / min rate ramp up to 550 o C, hold for 12h under argon atmosphere, wait until cooled to room temperature to obtain ...

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Abstract

The invention discloses a graphene-wrapped double metal selenide material, a preparation method and an application thereof. The preparation method comprises the following steps: (1) performing solvothermal reaction of cobalt salt, nickel salt, polyvinylpyrrolidone and trimesic acid in a solvent to obtain a reaction product NiCo-MOF; (2) subjecting NiCo-MOF to selenium oxidation and carbonization treatment to obtain the product NiCoSe 4 ; (3) NiCoSe 4 Solvothermal reaction with graphene oxide GO to obtain graphene-wrapped double metal selenide materials. The graphene-wrapped double metal selenide material provided by the present invention has mesoporous properties and a large specific surface area, which not only increases the interaction between sodium ions and the surface, enhances electrical conductivity, but also alleviates the volume expansion of the double metal selenide during charge and discharge. The resulting structural collapse effectively improves the cycle performance of the battery.

Description

technical field [0001] The invention belongs to the field of application of a preparation method for a sodium ion negative electrode material, and mainly relates to a graphene-wrapped bimetallic selenide material, a preparation method and application thereof. Background technique [0002] Lithium-ion batteries (LIBs) have long dominated the market and are considered to be the first choice for energy storage applications due to their advantages of large capacity, high voltage, long cycle life, and no memory effect. However, due to the current expensive lithium resources, the shortage of lithium limits its further development. Compared with lithium-ion batteries, sodium-ion batteries have attracted the attention of many researchers because of their low cost, abundant resources and similar physical and chemical properties of lithium, and are expected to replace lithium-ion in large-scale energy storage applications. Battery. [0003] Although the anode materials of Na-ion bat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/583H01M10/054
CPCH01M4/366H01M4/581H01M4/583H01M10/054H01M2004/027H01M2004/021Y02E60/10
Inventor 康雄武黄小连秦冬冬
Owner SOUTH CHINA UNIV OF TECH
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