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Carbon-assembled zinc sulfide cobalt sulfide hollow nanopolyhedral framework material and its preparation and application

A technology of hollow nano and frame materials, which is applied in the preparation/purification of cobalt sulfide, zinc sulfide, carbon, etc., can solve the problems that the volume change of zinc sulfide cannot be effectively suppressed, and achieve the promotion of electrochemical reaction, suppression of volume change, and improvement of cycle performance effect

Active Publication Date: 2021-10-08
HANGZHOU VOCATIONAL & TECHN COLLEGE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Patent CN109638243A discloses a zinc sulfide / multi-wall carbon nanotube composite material. Although the three-dimensional network structure composed of multi-wall carbon nanotubes significantly improves the electrical conductivity of the material, it cannot effectively inhibit the volume change of zinc sulfide and improve its cycle stability. sex

Method used

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  • Carbon-assembled zinc sulfide cobalt sulfide hollow nanopolyhedral framework material and its preparation and application
  • Carbon-assembled zinc sulfide cobalt sulfide hollow nanopolyhedral framework material and its preparation and application
  • Carbon-assembled zinc sulfide cobalt sulfide hollow nanopolyhedral framework material and its preparation and application

Examples

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Embodiment 1

[0035] (1) 1.13g Zn(NO 3 ) 2 ·6H 2 O and 0.54g Co(NO 3 ) 2 ·6H 2 O was dissolved in 80mL methanol, 3.7g dimethylimidazole was dissolved in 80mL methanol, Zn(NO 3 ) 2 and Co(NO 3 ) 2 Pour the methanol solution of dimethylimidazole into the methanol solution of dimethylimidazole, continue stirring at 20°C for 24 hours, centrifuge the product, wash it with methanol three times, and dry it at 60°C to obtain a zinc-cobalt mixed MOF.

[0036] (2) Disperse 0.2g zinc-cobalt mixed MOF prepared in step (1) in 40mL ethanol; dissolve 0.24g PVP in 12mL ethanol, then pour the ethanol solution of zinc-cobalt mixed MOF, stir well; heat the solution to boiling, And keep boiling until completely dry. Place the product at the downstream of the gas in the quartz tube furnace, place 0.24g of sublimed sulfur at the upstream of the gas in the quartz tube furnace, and inject argon at 2°C min -1 The rate is heated to 700 ° C and kept for 2 hours, and the carbon-assembled zinc sulfide cobalt ...

Embodiment 2

[0042] (1) 1.13g Zn(NO 3 ) 2 ·6H 2 O and 0.54g Co(NO 3 ) 2 ·6H 2 O was dissolved in 80mL methanol, 3.7g dimethylimidazole was dissolved in 80mL methanol, Zn(NO 3 ) 2 and Co(NO 3 ) 2 Pour the methanol solution of dimethylimidazole into the methanol solution of dimethylimidazole, continue stirring at 20°C for 24 hours, centrifuge the product, wash it with methanol three times, and dry it at 60°C to obtain a zinc-cobalt mixed MOF.

[0043] (2) Disperse 0.2g zinc-cobalt mixed MOF prepared in step (1) in 40mL ethanol; dissolve 0.30g PVP in 12mL ethanol, then pour the ethanol solution of zinc-cobalt mixed MOF, stir well; heat the solution to boiling, And keep boiling until completely dry. Place the product at the downstream of the gas in the quartz tube furnace, place 0.24g of sublimed sulfur at the upstream of the gas in the quartz tube furnace, and inject argon at 2°C min -1 The rate is heated to 700 ° C and kept for 2 hours, and the carbon-assembled zinc sulfide cobalt ...

Embodiment 3

[0047] (1) 1.13g Zn(NO 3 ) 2 ·6H 2 O and 0.54g Co(NO 3 ) 2 ·6H 2 O was dissolved in 80mL methanol, 3.7g dimethylimidazole was dissolved in 80mL methanol, Zn(NO 3 ) 2 and Co(NO 3 ) 2 Pour the methanol solution of dimethylimidazole into the methanol solution of dimethylimidazole, continue to stir at 2°C for 24 hours, centrifuge the product, wash it with methanol three times, and dry it at 60°C to obtain a zinc-cobalt mixed MOF.

[0048] Subsequent process is identical with embodiment 1.

[0049] The structure of the product carbon-assembled zinc sulfide cobalt sulfide hollow nanopolyhedron frame material is similar to that of Example 1, the main difference being that the zinc sulfide cobalt sulfide hollow nanopolyhedron becomes smaller, with a particle size of about 39 nm and a wall thickness of about 7 nm.

[0050] Adopt the same process as in Example 1 to make sodium ion battery electrodes, assemble into sodium ion batteries, with a current density of 500mA g -1 , 0....

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Abstract

The invention discloses a carbon-assembled zinc sulfide cobalt sulfide hollow nano polyhedron frame material, and the zinc sulfide cobalt sulfide hollow nano polyhedron is assembled into a three-dimensional frame structure with holes through carbon. The invention also discloses the preparation method of the carbon-assembled zinc sulfide-cobalt sulfide hollow nano-polyhedral framework material. First, the zinc-cobalt mixed metal-organic framework material is synthesized, and then the zinc-cobalt mixed metal-organic framework material is assembled by polyvinylpyrrolidone boiling method. Three-dimensional three-dimensional frame structure, and then the final product is obtained by one-step gas-phase vulcanization and carbonization. The invention can improve the electrical conductivity, structural stability and cycle stability of the zinc sulfide cobalt sulfide, so that the zinc sulfide cobalt sulfide has high specific capacity and stable cycle performance. Carbon-assembled zinc-cobalt sulfide hollow nanopolyhedral framework materials have important application value as electrode materials for sodium-ion batteries.

Description

technical field [0001] The invention relates to the technical field of sodium ion batteries, in particular to a carbon-assembled zinc sulfide cobalt sulfide hollow nano-polyhedron frame material and its preparation and application. Background technique [0002] Although lithium-ion batteries have been widely used in portable electronic devices and new energy vehicles, the high cost and low storage of related raw materials have driven further research on alternative batteries. Sodium is abundant on the earth, accounting for about 2.36% of the earth's crust, more than 1,000 times that of lithium, so sodium-ion batteries are ideal energy storage systems to replace lithium-ion batteries. Transition metal sulfides, as a class of anode materials for sodium-ion batteries, are considered to be promising candidates for anode materials due to their high theoretical specific capacities. Among them, the theoretical capacity of zinc sulfide is 963mAh g -1 , cobalt sulfide theoretical c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M10/054C01G51/00C01G9/08C01B32/05B82Y40/00B82Y30/00
CPCB82Y30/00B82Y40/00C01G9/08C01G51/30C01P2004/03C01P2004/50C01P2004/64C01P2004/80C01P2006/17C01P2006/40C01B32/05H01M4/364H01M4/5815H01M4/625H01M10/054Y02E60/10
Inventor 杨秋合袁永锋
Owner HANGZHOU VOCATIONAL & TECHN COLLEGE