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Carbon nanotube-in-tube@manganous-manganic oxide nanoparticle composite material, and preparation method and application thereof

A technology for oxidizing manganese nanometers and carbon nanotubes, applied in electrochemical generators, electrical components, battery electrodes, etc., can solve the problems of shedding, limited protection, limited load capacity, etc., to achieve increased load capacity, high mechanical strength, The effect of specific capacity and cycle performance improvement

Inactive Publication Date: 2021-09-21
HANGZHOU VOCATIONAL & TECHN COLLEGE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although these works have achieved good results, some problems still exist, such as Mn 3 o 4 It can only grow on the outer surface of carbon nanotubes (CNTs) and carbon fibers, so the loading capacity is limited, and the composite structure has a negative effect on Mn 3 o 4 limited protection, Mn 3 o 4 It is easy to fall off from the surface of CNTs and carbon fibers, therefore, designing new carbon substrate materials and constructing new Mn 3 o 4 / C composite structure needs further research

Method used

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  • Carbon nanotube-in-tube@manganous-manganic oxide nanoparticle composite material, and preparation method and application thereof
  • Carbon nanotube-in-tube@manganous-manganic oxide nanoparticle composite material, and preparation method and application thereof
  • Carbon nanotube-in-tube@manganous-manganic oxide nanoparticle composite material, and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] (1) 120mg Zn(NO 3 ) 2 ·6H 2 O was dissolved in 10ml methanol. 325 mg of 2-methylimidazole was dissolved in another 10 ml of methanol, and then 20 mg of acidified CNTs (30-50 nm in outer diameter, 7-10 nm in wall thickness) were further dispersed in this solution. Stir and mix the above two solutions, and further stir for 10min, pour the mixed solution into a 50mL Teflon autoclave, heat the autoclave to 90°C for 6h, cool to room temperature, centrifuge the product, and wash it with methanol for 3 times , and dried at 80°C to obtain ZIF-8@CNTs.

[0032] (2) Add 50mg ZIF-8@CNTs into 25ml ethanol. Then 25ml of aqueous solution in which 50mg of tannic acid was dissolved was added to the ZIF-8@CNTs solution, the product was separated after stirring for 5min, washed repeatedly, dried at 80°C, and the product was placed in a tube furnace and heated to Insulate at 600°C for 2h, heating rate 2°Cmin -1 . Then, the carbonized product was immersed in 0.2M HCl solution for 2 h...

Embodiment 2

[0040] (1) 120mg Zn(NO 3 ) 2 ·6H 2 O was dissolved in 10ml methanol. 325 mg of 2-methylimidazole was dissolved in another 10 ml of methanol, and then 20 mg of acidified CNTs (30-50 nm in outer diameter, 7-10 nm in wall thickness) were further dispersed in this solution. Stir and mix the above two solutions, and further stir for 10min, pour the mixed solution into a 50mL Teflon autoclave, heat the autoclave to 90°C for 6h, cool to room temperature, centrifuge the product, and wash it with methanol for 3 times , and dried at 80°C to obtain ZIF-8@CNTs.

[0041] (2) Add 50mg ZIF-8@CNTs into 25ml ethanol. Then 25ml of aqueous solution in which 50mg of tannic acid was dissolved was added to the ZIF-8@CNTs solution, the product was separated after stirring for 5min, washed repeatedly, dried at 80°C, and the product was placed in a tube furnace and heated to Insulate at 600°C for 2h, heating rate 2°Cmin -1 . Then, the carbonized product was immersed in 0.2M HCl solution for 2 h...

Embodiment 3

[0047] (1) 120mg Zn(NO 3 ) 2 ·6H 2O was dissolved in 10ml methanol. 325 mg of 2-methylimidazole was dissolved in another 10 ml of methanol, and then 20 mg of acidified CNTs (30-50 nm in outer diameter, 7-10 nm in wall thickness) were further dispersed in this solution. Stir and mix the above two solutions, and further stir for 10min, pour the mixed solution into a 50mL Teflon autoclave, heat the autoclave to 90°C for 6h, cool to room temperature, centrifuge the product, and wash it with methanol for 3 times , and dried at 80°C to obtain ZIF-8@CNTs.

[0048] (2) Add 50mg ZIF-8@CNTs into 25ml ethanol. Then 25ml of aqueous solution in which 50mg of tannic acid was dissolved was added to the ZIF-8@CNTs solution, the product was separated after stirring for 5min, washed repeatedly, dried at 80°C, and the product was placed in a tube furnace and heated to Insulate at 600°C for 2h, heating rate 2°Cmin -1 . Then, the carbonized product was immersed in 0.2M HCl solution for 2 h ...

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Abstract

The invention discloses a carbon nanotube-in-tube@manganous-manganic oxide nanoparticle composite material, a preparation method thereof and an application of the composite material in preparation of an aqueous zinc ion battery positive electrode. In the composite material, the carbon nanotube-in-tube is of a tube-in-tube structure which takes a carbon nanotube as an inner tube and an amorphous carbon nanotube as an outer tube and is formed by sleeving the inner tube with the outer tube; and manganous-manganic oxide nanoparticles are tightly coupled to the inner surfaces and the outer surfaces of the inner carbon nanotube and the outer carbon nanotube. The preparation method comprises the following steps: firstly synthesizing ZIF-8 nanoparticle strings CNTs, then carrying out tannic acid treatment and carbonization treatment to generate the carbon nanotube-in-tube, then reacting with potassium permanganate to grow MnO2 nanosheets on the inner and outer surfaces of the carbon nanotube-in-tube, and finally calcining to obtain the final product. According to the invention, the conductivity and the structural stability of Mn3O4 can be improved, so that the reversible capacity and the cycle performance of Mn3O4 are improved.

Description

technical field [0001] The invention relates to the technical field of water-based zinc-ion batteries, in particular to a carbon nanotube tube@trimanganese tetroxide (Mn 3 o 4 ) nanoparticle composites and their preparation and application. Background technique [0002] Due to the advantages of high specific capacity, good safety, low cost, and easy fabrication, rechargeable aqueous zinc-ion batteries (ZIBs) are promising candidates for green energy. Among the cathode materials for aqueous zinc-ion batteries, Mn-based materials are considered to be the most promising cathode materials due to their environmental friendliness and low price. mn 3 o 4 It is a Mn-based material that has only been studied in recent years, because it contains coexisting Mn 2+ and Mn 3+ Ions are easy to form defects inside, so the electrochemical activity is high. However, similar to the problems existing in other Mn-based materials, Mn 3 o 4 It also has the disadvantages of low electrical ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/505H01M4/583H01M4/62H01M10/36
CPCH01M4/362H01M4/505H01M4/583H01M4/625H01M10/36Y02E60/10
Inventor 杨秋合袁永锋
Owner HANGZHOU VOCATIONAL & TECHN COLLEGE
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