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Preparation method of nickel sulfide nanosheet anchored on inner surface of nitrogen-containing hollow carbon matrix, prepared product and application thereof

A hollow carbon, inner surface technology, applied in the field of nanomaterials, can solve the problems of limited theoretical capacity, poor stability, and inability to meet the needs of applications, and achieve the effect of reducing diffusion distance, excellent stability, and large electrolysis-electrode contact area.

Active Publication Date: 2021-03-30
ANHUI UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] In general, porous carbonaceous materials with high specific surface area can exhibit good cycling stability for both SIBs and KIBs, but their theoretical capacity is limited, which cannot meet the needs of future applications.
However, metal sulfides have a high theoretical capacity but poor stability. For example, a patent application with a publication number of CN 108933249 A discloses a nickel sulfide carbon-containing composite electrode material and its preparation method, and a sodium ion negative electrode battery material. The publication number is CN 110002424 A's patent application discloses nitrogen and oxygen co-doped porous carbon materials, preparation methods and applications. Therefore, making excellent cathode materials with high capacity and cycle stability is the key to sodium-ion batteries and potassium-ion batteries

Method used

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  • Preparation method of nickel sulfide nanosheet anchored on inner surface of nitrogen-containing hollow carbon matrix, prepared product and application thereof
  • Preparation method of nickel sulfide nanosheet anchored on inner surface of nitrogen-containing hollow carbon matrix, prepared product and application thereof
  • Preparation method of nickel sulfide nanosheet anchored on inner surface of nitrogen-containing hollow carbon matrix, prepared product and application thereof

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Embodiment 1

[0054] A method for preparing nickel sulfide nanosheets anchored on the inner surface of a nitrogen-containing hollow carbon matrix, specifically comprising the following steps:

[0055] (1) At room temperature, 237mg of nickel chloride was dissolved in 15mL of methanol to form solution A, and 300mg of polyvinylpyrrolidone and 328mg of 2-methylimidazole were dissolved in 15ml of methanol to form solution B.

[0056] (2) Mix the obtained solution A and solution B with stirring and slowly drop them together. After the mixture was stirred for 5 min, it was allowed to stand at room temperature for 24 h. The prepared samples were centrifuged, washed three times with methanol, and then dried in an oven at 60 °C for 6 h to obtain a yellow precursor.

[0057] (3) Carbonize the prepared precursor in a nitrogen atmosphere at 600 °C at a heating rate of 10 °C / min for 2 h to obtain a black sample, which is ultrasonically dispersed into 30 mL of deionized water, and then 10 mL of hydroch...

Embodiment 2

[0065] A method for preparing nickel sulfide nanosheets anchored on the inner surface of a nitrogen-containing hollow carbon matrix, specifically comprising the following steps:

[0066] (1) At room temperature, 240.5 mg of nickel chloride was dissolved in 15 mL of methanol to form solution A, and 300 mg of polyvinylpyrrolidone and 492 mg of 2-methylimidazole were dissolved in 15 mL of methanol to form solution B.

[0067] (2) Mix the obtained solution A and solution B with stirring and slowly drop them together. After the mixture was stirred for 5 min, it was allowed to stand at room temperature for 24 h. The prepared samples were centrifuged, washed three times with methanol, and then dried in an oven at 60 °C for 6 h to obtain a yellow precursor.

[0068] (3) Carbonize the prepared precursor in a nitrogen atmosphere at 600 °C at a heating rate of 10 °C / min for 2 h to obtain a black sample, which is ultrasonically dispersed into 30 mL of deionized water, and then 10 mL of ...

Embodiment 3

[0071] Adopt the nickel sulfide nanosheet in embodiment 1 to prepare sodium ion, potassium ion battery negative electrode material, specifically comprise the following steps:

[0072] Mix the nickel sulfide nanosheets anchored on the inner surface of the nitrogen-containing hollow carbon matrix, acetylene black and polyvinylidene fluoride at a mass ratio of 80:10:10 to form a slurry, and then coat the slurry on the copper foil , and dried at 80°C to obtain electrode sheets.

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Abstract

The invention discloses a preparation method of a nickel sulfide nanosheet anchored on the inner surface of a nitrogen-containing hollow carbon matrix, and relates to the technical field of nano materials. The preparation method comprises the following steps of (1) respectively dissolving nickel chloride, polyvinylpyrrolidone and 2methylimidazole in methanol at room temperature to obtain a nickelchloride solution and a 2-methylimidazole solution; (2) mixing and stirring the solution, standing, and centrifuging to obtain a precursor; (3) heating and carbonizing the precursor in an inert gas atmosphere, ultrasonically dispersing the precursor in deionized water, and adding mixed acid; and (4) washing and drying, namely respectively placing the sample and sulfur powder at a lower air port and an upper air port of a tubular furnace, heating and preserving heat. The invention also provides a product obtained by adopting the preparation method and an application of the product. The advantages of the present invention are that the method is safe and easy to implement and is short in synthesis period, large-scale preparation can be achieved, popularization and industrial application are expected, and the material has great application potential at the aspects of batteries, electrochemical energy storage, catalysis and the like.

Description

technical field [0001] The invention relates to the technical field of nanomaterials, in particular to a preparation method of nickel sulfide nanosheets anchored on the inner surface of a nitrogen-containing hollow carbon matrix, a prepared product and an application thereof. Background technique [0002] Lithium-ion batteries have been widely used commercially in portable electronic devices and electric vehicles in recent years due to their high energy density and long cycle life. Considering the uneven distribution of Li resources and the scarcity (20 ppm) of Li resources in the Earth's crust, it is desirable to develop rechargeable metal-ion batteries based on low-cost and earth-abundant elements such as Na (23,000 ppm) and Potassium (17,000 ppm). Moreover, sodium and potassium share similar physicochemical properties and electrochemical reaction mechanisms with lithium, making SIBs and KIBs promising alternatives to LIBs. Therefore, it is crucial to explore reversible a...

Claims

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Application Information

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IPC IPC(8): H01M4/62H01M4/58H01M10/054H01M10/04B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00H01M4/5815H01M4/625H01M10/0427H01M10/054H01M2004/021H01M2004/027Y02E60/10Y02P70/50
Inventor 郑方才徐世凯王俊中
Owner ANHUI UNIVERSITY
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