Carbon assembled zinc sulfide hollow nanopolyhedral honeycomb material and its preparation and application

A technology of hollow nano and honeycomb materials, which is applied in the field of lithium-ion batteries, can solve the problems of inability to effectively inhibit the volume change of zinc sulfide, unfavorable electrochemical reactions, and unfavorable electrolyte infiltration into its interior, so as to improve structural strength and cycle stability. Improved formability and structural integrity, good protection 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 CN105355890A discloses a zinc sulfide-graphene composite lithium-ion battery negative electrode material, but simple compounding can only improve the conductivity of zinc sulfide, but cannot effectively inhibit the volume change of zinc sulfide and improve its cycle stability
YongqiangTeng et al. reported dragon fruit-like carbon-coated ZnS / C nanospheres and their lithium-ion battery performance (Pitaya-like carbon-coated ZnS / carbon nanospheres with inner three-dimensional nanostructure ahigh-performance anode for lithium-ion battery, Journal of Colloid and Interface Science 554(2019) 220-228), embedding nano-zinc sulfide in carbon spheres can effectively inhibit its volume change, but the dense carbon sphere structure is not conducive to the penetration of electrolyte into its interior, which is not conducive to the progress of electrochemical reactions , especially high-rate electrochemical reactions

Method used

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  • Carbon assembled zinc sulfide hollow nanopolyhedral honeycomb material and its preparation and application
  • Carbon assembled zinc sulfide hollow nanopolyhedral honeycomb material and its preparation and application
  • Carbon assembled zinc sulfide hollow nanopolyhedral honeycomb material and its preparation and application

Examples

Experimental program
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Effect test

Embodiment 1

[0034] (1) 1.13g Zn(NO 3 ) 2·6H 2 O and 1.85g dimethylimidazole were dissolved in 80mL methanol respectively, Zn(NO 3 ) 2 Pour the methanol solution of dimethylimidazole into the methanol solution of dimethylimidazole, continue to stir at 20°C for 24 hours, centrifuge the product, wash it with methanol three times, and dry it at 60°C to obtain ZIF-8.

[0035] (2) Disperse 0.1g ZIF-8 prepared in step (1) in 20mL ethanol; dissolve 0.12g PVP in 6mL ethanol, then pour into the ethanol solution of ZIF-8, stir well; dry the solution in an oven at 70°C ;Put the product at the downstream of the gas in the quartz tube furnace, place 0.12g of sublimed sulfur at the upstream of the gas in the quartz tube furnace, feed argon, and heat at 2°C min -1 The rate of heating to 700 ℃ and holding for 1.5h, to obtain carbon-assembled zinc sulfide hollow nano-polyhedral honeycomb material.

[0036] figure 1 It is the SEM photo of ZIF-8 prepared. ZIF-8 is a crystal with dodecahedral structure,...

Embodiment 2

[0042] (1) 1.13g Zn(NO 3 ) 2 ·6H 2 O and 1.85g dimethylimidazole were dissolved in 80mL methanol respectively, Zn(NO 3 ) 2 Pour the methanol solution of dimethylimidazole into the methanol solution of dimethylimidazole, continue to stir at 20°C for 24 hours, centrifuge the product, wash it with methanol three times, and dry it at 60°C to obtain ZIF-8.

[0043] (2) Disperse 0.1g ZIF-8 prepared in step (1) in 20mL ethanol; dissolve 0.16g PVP in 6mL ethanol, then pour into the ethanol solution of ZIF-8, stir well; dry the solution in an oven at 70°C ;Put the product at the downstream of the gas in the quartz tube furnace, place 0.12g of sublimed sulfur at the upstream of the gas in the quartz tube furnace, feed argon, and heat at 2°C min -1 The rate of heating to 700 ℃ and holding for 1.5h, to obtain carbon-assembled zinc sulfide hollow nano-polyhedral honeycomb material.

[0044] The structure of the product carbon-assembled zinc sulfide hollow nanopolyhedral honeycomb mate...

Embodiment 3

[0047] (1) 1.13g Zn(NO 3 ) 2 ·6H 2 O and 1.85g dimethylimidazole were dissolved in 80mL methanol respectively, Zn(NO 3 ) 2 Pour the methanol solution of dimethylimidazole into the methanol solution of dimethylimidazole, continue to stir at 35°C for 24 hours, centrifuge the product, wash it with methanol three times, and dry it at 60°C to obtain ZIF-8.

[0048] Subsequent process is identical with embodiment 1.

[0049] The structure of the product carbon-assembled zinc sulfide hollow nanopolyhedron honeycomb material is similar to that of Example 1, the main difference is that the zinc sulfide hollow nanopolyhedron becomes larger, with a particle size of about 100 nm and a wall thickness of about 13 nm.

[0050] Adopt the same technology as embodiment 1 to make lithium ion battery negative electrode, assemble into lithium ion battery, with current density 500mA g -1 , 0.01 ~ 3.0V voltage range for cycle charge and discharge test. The discharge specific capacity of the fi...

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Abstract

The invention discloses a carbon-assembled zinc sulfide hollow nano-polyhedron honeycomb material. The zinc sulfide hollow nano-polyhedron is assembled into a three-dimensional honeycomb structure through carbon, and the carbon is amorphous carbon formed by carbonization of polyvinylpyrrolidone. The invention also discloses a method for preparing the carbon-assembled zinc sulfide hollow nano-polyhedral honeycomb material. First, the zinc MOF material ZIF-8 is synthesized, and then ZIF-8 is densely assembled with polyvinylpyrrolidone, and then through one-step gas phase vulcanization and carbonization method to obtain the final product. The invention can improve the electrical conductivity, structural stability and cycle stability of the zinc sulfide, so that the zinc sulfide has high specific capacity and stable cycle performance. Carbon-assembled zinc sulfide hollow nanopolyhedral honeycomb materials have important application value as anode materials for lithium-ion batteries.

Description

technical field [0001] The invention relates to the technical field of lithium-ion batteries, in particular to a carbon-assembled zinc sulfide hollow nano-polyhedral honeycomb material and its preparation and application. Background technique [0002] Lithium-ion batteries have high energy density and long cycle life, and have been widely used in portable electronic devices, new energy vehicles and other fields. The performance of lithium-ion batteries mainly depends on the anode material. Graphite is currently the main anode material for lithium-ion batteries, with a theoretical capacity of 372mAh g -1 , the actual capacity is very close to the theoretical capacity, and it is difficult to further increase, so graphite can no longer meet the new requirements of the market for high-capacity power supplies; in addition, the safety performance of graphite is poor, and the rate performance is low, so there is an urgent need to develop high-ratio Capacitive, high-safety new ano...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/58H01M4/62H01M10/0525C01G9/08C01B32/05B82Y40/00B82Y30/00
CPCB82Y30/00B82Y40/00C01G9/08C01P2004/03C01P2004/30C01P2004/50C01P2004/64C01P2004/80C01P2006/40C01B32/05H01M4/5815H01M4/625H01M10/0525Y02E60/10
Inventor 杨秋合袁永锋
Owner HANGZHOU VOCATIONAL & TECHN COLLEGE
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