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Carbon nanotube string carbon hollow polyhedral nanosphere material as well as preparation and application thereof

A technology of carbon nanotubes and polyhedrons, which is applied in the direction of carbon nanotubes, nanocarbons, nanotechnology, etc., can solve the problems of large contact resistance and loose contact, achieve short embedding paths, increase electrical conductivity, and reduce contact resistance. Effect

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

AI Technical Summary

Problems solved by technology

At present, most carbon hollow nanospheres are made of SiO 2 , polystyrene balls and other templates, and the contact between carbon hollow nanospheres in the prepared electrode is not close, and the contact resistance is large, so the application of carbon hollow nanospheres in the field of sodium-ion batteries remains to be further studied. Research

Method used

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  • Carbon nanotube string carbon hollow polyhedral nanosphere material as well as preparation and application thereof
  • Carbon nanotube string carbon hollow polyhedral nanosphere material as well as preparation and application thereof
  • Carbon nanotube string carbon hollow polyhedral nanosphere material as well as preparation and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] (1) 720mg Zn(NO 3 ) 2 ·6H 2 O was dissolved in 20 mL of methanol and stirred for 10 min as solution 1; 1950 mg of dimethylimidazole and 40 mg of acidified carbon nanotubes were dissolved in 20 mL of methanol, and the solution was sonicated 4 times for 5 min each as solution 2. Quickly pour solution 1 into solution 2, stir for 5 minutes to form a mixed solution; transfer the mixed solution to a 100mL Teflon autoclave, put the Teflon autoclave in a 90°C oven for 6 hours, and after natural cooling, wash it with methanol for three The product was collected by centrifugation, and the obtained product was dried in an oven at 60° C. to obtain ZIF-8@carbon nanotubes.

[0028] (2) Disperse 500mg of ZIF-8@carbon nanotubes in 250mL of ethanol, sonicate for 15min to form a uniform mixed solution, as solution 3; dissolve 500mg of tannic acid in 250mL of deionized water, stir for 15min to form a uniform mixture Solution, as solution 4: quickly pour solution 4 into solution 3, stir...

Embodiment 2

[0034] (1) 720mg Zn(NO 3 )·6H 2 O was dissolved in 20 mL of methanol and stirred for 10 min as solution 1; 1950 mg of dimethylimidazole and 40 mg of acidified carbon nanotubes were dissolved in 20 mL of methanol, and the solution was sonicated 4 times for 5 min each as solution 2. Quickly pour solution 1 into solution 2, stir for 5 minutes to form a mixed solution; transfer the mixed solution to a 100mL Teflon autoclave, put the Teflon autoclave in a 90°C oven for 6 hours, and after natural cooling, wash it with methanol for three The product was collected by centrifugation, and the obtained product was dried in an oven at 60° C. to obtain ZIF-8@carbon nanotubes.

[0035] (2) Disperse 500mg of ZIF-8@carbon nanotubes in 250mL of ethanol, sonicate for 15min to form a uniform mixed solution, as solution 3; dissolve 750mg of tannic acid in 250mL of deionized water, stir for 15min to form a uniform mixture Solution, as solution 4: quickly pour solution 4 into solution 3, stir for...

Embodiment 3

[0039] (1) 936mg Zn(NO 3 )·6H 2 O was dissolved in 20 mL of methanol and stirred for 10 min as solution 1; 2535 mg of dimethylimidazole and 40 mg of acidified carbon nanotubes were dissolved in 20 mL of methanol, and the solution was sonicated 4 times for 5 min each as solution 2. Quickly pour solution 1 into solution 2, stir for 5 minutes to form a mixed solution; transfer the mixed solution to a 100mL Teflon autoclave, put the Teflon autoclave in a 90°C oven for 6 hours, and after natural cooling, wash it with methanol for three The product was collected by centrifugation, and the obtained product was dried in an oven at 60° C. to obtain ZIF-8@carbon nanotubes.

[0040] Subsequent steps are the same as in Example 1.

[0041] The structure of the product carbon nanotube string carbon hollow polyhedral nanosphere material is similar to that of Example 1, the main difference being that the size of the carbon hollow polyhedral nanosphere increases to about 250 nm.

[0042] Th...

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Abstract

The invention discloses a carbon nanotube string carbon hollow polyhedral nanosphere material as well as a preparation method and application thereof in preparation of a sodium ion battery negative electrode. According to the carbon nanotube string carbon hollow polyhedral nanosphere material, carbon nanotubes penetrate through and are connected with a plurality of carbon hollow polyhedral nanospheres to form sugarcoated haw string-shaped structures. The preparation method comprises the following steps of: firstly, growing ZIF-8 particles on the surfaces of the carbon nanotubes to form the sugarcoated haw string-shaped structures, then treating the ZIF-8 carbon nanotubes with tannic acid to obtain a precursor, and finally performing carbonization treatment to obtain a final product. The sodium storage capacity and the structural stability of the carbon hollow nanosphere can be improved, so that the carbon nanotube string carbon hollow polyhedral nanosphere material has relatively high reversible capacity and stable cycle performance. The carbon nanotube string carbon hollow polyhedral nanosphere material has important application value as a sodium ion battery negative electrode material.

Description

technical field [0001] The invention relates to the technical field of sodium ion batteries, in particular to a carbon nanotube string carbon hollow polyhedral nanosphere material and its preparation and application. Background technique [0002] Although lithium-ion batteries are widely used, lithium reserves are limited and unevenly distributed, which limits the further development of lithium-ion batteries. Sodium has similar electrochemical properties to lithium, but it is abundant in reserves, the price of raw materials is low, and it is widely distributed around the world, and sodium-ion batteries have a similar deintercalation mechanism to lithium-ion batteries, so sodium-ion batteries are an alternative to lithium-ion batteries One of the best candidates. [0003] Anode materials are the main factor limiting the electrochemical performance of Na-ion batteries. Carbon-based materials have the characteristics of abundant raw materials, low cost, simple synthesis, and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/583H01M4/62H01M10/054C01B32/158B82Y30/00B82Y40/00
CPCH01M4/583H01M4/625H01M10/054C01B32/158B82Y30/00B82Y40/00Y02E60/10
Inventor 杨秋合袁永锋
Owner HANGZHOU VOCATIONAL & TECHN COLLEGE
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