Method for preparing ZIF-67 polyhedron to obtain velvet hollow polyhedron Co9S8 <at> MoS2

A technology of ZIF-67 and polyhedron, which is applied in the field of preparation of hollow polyhedron Co9S8@MoS2, can solve the problems of poor charge and discharge performance, and achieve the effect of improving crystallinity

Inactive Publication Date: 2019-01-11
YANGZHOU UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The third is the stability of the battery and the charge and discharge problems at high rates. At present, single transition metal sulfides ar

Method used

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  • Method for preparing ZIF-67 polyhedron to obtain velvet hollow polyhedron Co9S8 &lt;at&gt; MoS2
  • Method for preparing ZIF-67 polyhedron to obtain velvet hollow polyhedron Co9S8 &lt;at&gt; MoS2
  • Method for preparing ZIF-67 polyhedron to obtain velvet hollow polyhedron Co9S8 &lt;at&gt; MoS2

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] 1. Preparation of α-CoS hollow polyhedron

[0028] Co(NO 3 ) 2 ·6H 2 O 291 mg and 2-methylimidazole 328 mg were dissolved in 25 ml methanol solution and mixed, stirred at room temperature for 24 h, after the reaction was over, centrifuged at 6000 rpm for 5 min, washed with ethanol 4 times, and obtained the solid phase at 60 After drying at ℃ for 6 h, ZIF-67 nano-polyhedrons were formed.

[0029] Take 30 mg of ZIF-67 nano polyhedron and disperse it in 30 ml ethanol solution ultrasonically, add 150 mg of thioacetamide and react at 40°C for 24 h. After the reaction is over, centrifuge at 5000 rpm for 5 min, and wash with water and ethanol 3 Next, a hollow α-CoS polyhedron with a shell thickness of 40 nm was obtained.

[0030] The made α-CoS hollow polyhedron has a particle size of about 300~600 nm. The middle part of ZIF-67 is completely etched to form a hollow structure of α-CoS polyhedron. The surface is flat and uniform, and the wall thickness is controlled at 15~ At 40 nm, ...

Embodiment 2

[0035] 1. Preparation of α-CoS hollow polyhedron

[0036] Co(NO 3 ) 2 ·6H 2 O 291 mg and 2-methylimidazole 656 mg were dissolved in 25 ml methanol solution and mixed, stirred at room temperature for 24 hours, after the reaction was over, centrifuged at 6000 rpm for 5 min, washed with ethanol 4 times, and obtained the solid phase at 60℃ Dry for 6 hours to form a ZIF-67 nano-polyhedron.

[0037] Take 30 mg of ZIF-67 nano polyhedron and disperse it in 30 ml ethanol solution ultrasonically, add 90 mg thioacetamide and transfer to a 50 ml high temperature and high pressure reactor, and react at 100℃ for 5 hours. After the reaction is over, centrifuge at 5000 rpm for 5 min. , Washed with water and ethanol three times each to obtain α-CoS hollow polyhedrons with a shell thickness of 20 nm.

[0038] 2. Preparation of the fleece shell hollow polyhedron Co 9 S 8 @MoS 2

[0039] Disperse 30 mg of α-CoS hollow polyhedron with a wall thickness of 20 nm in 25 ml of water, add 150 mg of sodium moly...

Embodiment 3

[0042] 1. Preparation of α-CoS hollow polyhedron

[0043] Co(NO 3 ) 2 ·6H 2 291 mg of O and 1312 mg of 2-methylimidazole were dissolved in 25 ml methanol solution and mixed, stirred at room temperature for 24 hours, after the reaction, centrifuged at 6000 rpm for 5 min, washed with ethanol 4 times, and obtained the solid phase at 60℃ Dry for 6 hours to form a ZIF-67 nano-polyhedron.

[0044] Take 30 mg of ZIF-67 nano polyhedron and disperse it in 30 ml ethanol solution ultrasonically, add 300 mg of thioacetamide and transfer to a 50 ml high temperature and high pressure reactor, and react at 200 ℃ for 10 min. After the reaction is over, centrifuge at 5000 rpm for 5 min. Washed with water and ethanol three times each to obtain α-CoS hollow polyhedrons with a shell thickness of 15 nm.

[0045] 2. Preparation of the fleece shell hollow polyhedron Co 9 S 8 @MoS 2

[0046] Disperse 30 mg of the obtained α-CoS hollow polyhedron with a wall thickness of 15 nm in 50 ml of water, add 300 mg o...

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Abstract

The invention discloses a method for preparing a ZIF-67 polyhedron to obtain a velvet hollow polyhedron Co9S8 <at> MoS2. In ZIF-67 derivatize to alpha-CoS hollow polyhedron is then grown on that inn surface of the CoS hollow polyhedron to form a two-dimensional lamellar material MoS2, Co9S8 <at> MoS2, which form that hollow polyhedron structure of velvet shell. The hollow polyhedron Co9S8 <at> MoS2 with N-doped amorphous carbon can improve the conductivity of the composites, and the hollow structure can buffer the volume effect in the charge-discharge process. The Co9S8 polyhedron itself has ahigh theoretical specific capacity, and the two-dimensional layered material MoS2 grows in situ on Alpha-CoS forms MoS2 velvet shell on the inner and outer surfaces of the polyhedron, which further increases the lithium storage capacity and enhances the rate performance. When Co9S8 <at> MoS2 is used as the negative electrode material of lithium ion battery, Co9S8 and MoS2 exert synergistic effect, and the surface MoS2 increases the lithium storage capacity and the buffer volume changes. The hollow Co_9S_8 skeleton further buffers the volume effect of lithium ion intercalation. This material is a promising lithium ion anode material.

Description

Technical field [0001] The invention belongs to the technical field of production of negative electrode materials for lithium-ion batteries, and specifically relates to the derivatization of ZIF-67 polyhedrons to obtain fleece shell hollow polyhedron Co 9 S 8 @MoS 2 The preparation method. Background technique [0002] Metal organic framework materials (MOFs) are a kind of coordination polymers that have developed rapidly in the past ten years. They refer to crystalline porous materials with periodic network structures formed by self-assembly of transition metal ions and organic ligands. It has the advantages of high porosity, low density, large specific surface area, regular pores, adjustable pore size, and topological structure diversity and tailorability. It has a three-dimensional pore structure. Generally, metal ions are used as connection points and organic ligands support. Constructing a 3D extension of the space, it is another important new type of porous material besides...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M10/0525B82Y30/00
CPCB82Y30/00H01M4/366H01M4/5815H01M4/625H01M4/628H01M10/0525H01M2004/021H01M2004/027Y02E60/10
Inventor 陈铭李文龙周克寒沈超韩悦吴化雨戴兰轩
Owner YANGZHOU UNIV
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