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Preparation and application of super-long-cycle polyatom-doped hollow carbon electrode material

A polyatomic, carbon electrode technology, applied in the preparation/purification of carbon, battery electrodes, circuits, etc., can solve the problems affecting the performance of potassium ion batteries, unfavorable potassium ion adsorption, small specific surface area, etc., and achieve abundant defects and active sites. point, improve the rate performance and cycle stability, the effect of large specific surface area

Active Publication Date: 2021-10-22
JINAN UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Chinese patent publication CN112079346A discloses a double-shell hollow spherical organometallic framework material and its preparation method. Using sulfonated polystyrene beads as a template, a new nano-spherical organometallic framework compound HS-ZIF was synthesized by a hard template method -8, the material has a double-shell shell structure, but its particle size is too large, which affects the performance of the potassium ion battery
The material has a hollow cubic structure, but the specific surface area is relatively small, which is not conducive to the adsorption of potassium ions

Method used

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  • Preparation and application of super-long-cycle polyatom-doped hollow carbon electrode material
  • Preparation and application of super-long-cycle polyatom-doped hollow carbon electrode material
  • Preparation and application of super-long-cycle polyatom-doped hollow carbon electrode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Step 1: Disperse 400 mg of nano magnesium oxide with a particle size of 50 nm in 50 ml of methanol.

[0035] Step 2: Dissolve hexachlorotriphosphazene and 4,4'-dihydroxydiphenylsulfone with a total mass of 228mg and a molar ratio of 1:2.25 in 10ml of methanol.

[0036] Step 3: Add the solution in Step 2 to the solution in Step 1, add 185 μL of triethylamine during stirring, and keep polymerization at room temperature for 6 hours.

[0037] Step 4: The product obtained in Step 3 was centrifuged, washed and dried, and then placed in a tube furnace for heat treatment. In a nitrogen atmosphere, the temperature was raised from room temperature to 900 °C at a heating rate of 2 °C / min, and kept for 2 hours to fully Calcination, after the calcination is completed, a calcined product is obtained.

[0038] Step 5: Remove the magnesium oxide template from the calcined product obtained in Step 4 with 3 mol / L hydrochloric acid to obtain nitrogen, phosphorus, and sulfur-doped hollow ...

Embodiment 2

[0040] Step 1: Disperse 400 mg of nano magnesium oxide with a particle size of 100 nm in 50 ml of methanol.

[0041] Step two to step five are consistent with embodiment 1.

Embodiment 3

[0043] Steps 1 to 3 are consistent with Example 1.

[0044] Step 4: The product obtained in Step 3 was centrifuged, washed and dried, then placed in a tube furnace for heat treatment, and heated from room temperature to 700°C in a nitrogen atmosphere at a heating rate of 2°C / min, and kept for 2 hours for full Calcination, after the calcination is completed, a calcined product is obtained.

[0045] Step 5 is consistent with Embodiment 1.

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Abstract

The invention belongs to the field of potassium ion batteries, and discloses a preparation method and application of an ultra-long cycle polyatom doped hollow carbon electrode material. The preparation method comprises the following steps: preparing a magnesium oxide-polycyclotriphosphazene-dihydroxy diphenyl sulfone composite material from magnesium oxide particles, phosphonitrilic chloride trimer and dihydroxy diphenyl sulfone, and calcining and removing a magnesium oxide template to obtain nitrogen, phosphorus and sulfur multi-atom co-doped hollow carbon, namely the ultra-long cycle multi-atom doped hollow carbon electrode material. The ultra-long cycle multi-atom doped hollow carbon electrode material is simple in synthesis method and large in specific surface area, has a cross-linked structure and abundant defects and active sites, and can well improve the rate capability and cycle stability of a potassium ion battery as a negative electrode material of the potassium ion battery.

Description

technical field [0001] The invention belongs to the field of potassium ion batteries, in particular to a preparation method and application of an ultra-long cycle polyatom doped hollow carbon electrode material. Background technique [0002] Due to the non-renewability of fossil fuel energy and the pollution of the environment caused by the emission of chemical gases, the demand for new green and environmentally friendly energy continues to rise along with the rapid development of the economy and society. As the carrier of new energy, large-scale energy storage equipment is of great significance to its development. Lithium-ion batteries have been commercially used in energy devices, but the lack of lithium resources and lack of excellent battery performance are the bottlenecks that limit the development of potassium-ion batteries. Potassium ion battery is a strong candidate, with its rich potassium resources and standard redox potential close to that of lithium, it can be e...

Claims

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Application Information

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IPC IPC(8): H01M4/587H01M10/054C01B32/05
CPCH01M4/587H01M10/054C01B32/05Y02E60/10
Inventor 李宏岩刘喜孙影娟
Owner JINAN UNIVERSITY
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