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Multi-shell metal oxide hollow sphere synthesized based on anion adsorption and preparation method as well as application thereof

An oxide and anion technology, applied in vanadium oxide, electrochemical generators, electrical components, etc., can solve the problems of difficult to synthesize metal oxide hollow structure, limited metal cation adsorption capacity, etc.

Active Publication Date: 2016-07-13
中科汇生(北京)医药科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, since many metal ion precursors are usually in the form of anions (such as VO 3- , MnO 4 2- 、MoO 4 2- , CrO 4 2- , W 7 o 24 6- etc.), although it can exist in the form of cations at low pH values, the negative charge of the carbon sphere template will decrease rapidly as the pH value decreases, resulting in a very limited adsorption of metal cations, and it is difficult to synthesize a multi- Metal oxide hollow structure of the shell

Method used

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  • Multi-shell metal oxide hollow sphere synthesized based on anion adsorption and preparation method as well as application thereof
  • Multi-shell metal oxide hollow sphere synthesized based on anion adsorption and preparation method as well as application thereof
  • Multi-shell metal oxide hollow sphere synthesized based on anion adsorption and preparation method as well as application thereof

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Experimental program
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Embodiment 1

[0077] The sucrose aqueous solution with a concentration of 1.5M was hydrothermally reacted in an autoclave at 200°C for about 130min, cooled naturally, filtered with suction, washed with water several times, and dried in an oven at 80°C for 24h. The obtained carbon sphere diameter About 2.7 μm.

[0078] Disperse the carbon sphere template evenly in 0.01MNH 4 VO 3 in solution. After stirring for 6 hours at 70°C, it was filtered with suction, washed three times with deionized water, and dried in an oven at 120°C for 12 hours. Then the carbon spheres after adsorbing the vanadium salt were redispersed in 0.01MNH 4 VO 3 In the solution, repeat the above adsorption, washing, and drying process once, put the obtained solid powder in a muffle furnace, heat up to 400°C at a rate of 0.5°C / min, calcinate at a constant temperature for 30min, and obtain a double-shell V after natural cooling. 2 o 5 Hollow sphere with a shell size of about 1.1 μm.

[0079] Double shell V with a weig...

Embodiment 2

[0083] The sucrose aqueous solution with a concentration of 1.5M was hydrothermally reacted in an autoclave at 200°C for about 130min, cooled naturally, filtered with suction, washed with water several times, and dried in an oven at 80°C for 24h. The obtained carbon sphere diameter About 2.7 μm.

[0084] Disperse the carbon sphere template evenly in 0.1M NH 4 VO 3 in solution. After stirring for 6 hours at 70°C, it was filtered with suction, washed three times with deionized water, and dried in an oven at 60°C for 24 hours. Then redisperse the carbon spheres after absorbing the vanadium salt in glacial acetic acid, centrifuge after stirring for 8 hours, and wash twice with deionized water. Calcined at a constant temperature for 30 minutes, and naturally cooled to obtain a thin-walled three-shell V 2 o 5 Hollow sphere with a shell size of about 1.1 μm.

[0085] Thin-walled three-shell V with a weight ratio of 7:2:1 2 o 5Hollow spheres, acetylene black and PVDF are unifo...

Embodiment 3

[0089] The sucrose aqueous solution with a concentration of 1.5M was hydrothermally reacted in an autoclave at 200°C for about 130min, cooled naturally, filtered with suction, washed with water and ethanol several times, and dried in an oven at 80°C for 12h. The ball diameter is about 2.7 μm.

[0090] Evenly disperse the carbon sphere template in 0.01MK 2 MnO 4 In the aqueous solution, the solvent is a mixture of water and ethanol, and the volume ratio of the two is 1:3. At 30°C, stir for 12 hours, then filter with suction, wash with deionized water for 3 times, and dry in an oven at 80°C for 12 hours. The powder is placed in a muffle furnace, heated up to 450°C at 5°C / min, calcined at a constant temperature for 2 hours, and then naturally cooled to obtain triple-shelled MnO 2 Hollow sphere with a shell size of about 1.2 μm.

[0091] The transmission electron microscope pictures of the product are as follows: Figure 4 As shown in a, it is a hollow sphere with a three-shel...

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Abstract

The invention relates to a multi-shell metal oxide hollow sphere synthesized based on anion adsorption and a preparation method as well as application thereof. The preparation method of the multi-shell metal oxide hollow sphere synthesized based on the anion adsorption comprises the following steps of using a carbon sphere prepared by utilizing a hydrothermal method as a template, and obtaining the metal oxide hollow sphere with a multi-shell structure through uniformly dispersing the carbon sphere template in a metal anionic salt solution and further roasting an obtained mixture at a high temperature. The hollow sphere prepared by adopting the method can be modulated in the number of shells between two layers and five layers, is controllable in size and shell wall thickness, is applied to the field of lithium ion batteries, shows performance superior to that of a nano sheet or a single-shell hollow sphere, and has a wide application prospect; the advantages of a low-dimensional nano material and a three-dimensional hollow structure are effectively combined.

Description

technical field [0001] The invention belongs to the technical field of functional materials, and in particular relates to a multi-shell metal oxide hollow sphere and its preparation method and application, in particular to a multi-shell metal oxide hollow sphere synthesized based on anion adsorption and its preparation method and application . Background technique [0002] At present, multi-shell hollow micro / nanostructures have the characteristics of large specific surface area, high loading capacity, light density, internal cavity, and shell walls composed of low-dimensional nanoparticles or nanorods, so they have been widely used in many fields. , such as sustained drug release, catalysis, sensing, water pollution control, nanoreactors, and energy storage systems. Among them, multi-shell metal oxide hollow spheres are used as electrode materials for lithium-ion batteries. Not only does the electrode material have a large contact area with the electrolyte, and there are m...

Claims

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Application Information

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IPC IPC(8): H01M4/48H01M10/0525C01G31/02
CPCC01G31/02C01P2002/72C01P2004/04C01P2004/61C01P2006/12C01P2006/40H01M4/48H01M10/0525Y02E60/10
Inventor 王丹王江艳毛丹
Owner 中科汇生(北京)医药科技有限公司
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