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Carbon network supported zinc oxide nanocrystalline composite material and preparation method and application thereof

A zinc oxide nanocrystal, network loading technology, applied in nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve the problems of harsh preparation process of porous carbon with high specific surface area, and achieve good application prospects, Increased conductivity and easy-to-achieve effects

Inactive Publication Date: 2014-12-03
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the high specific surface area and harsh preparation process of porous carbon are still a disadvantage that cannot be ignored.

Method used

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  • Carbon network supported zinc oxide nanocrystalline composite material and preparation method and application thereof
  • Carbon network supported zinc oxide nanocrystalline composite material and preparation method and application thereof
  • Carbon network supported zinc oxide nanocrystalline composite material and preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 2

[0028] 1.24 g Zn(NO 3 ) 2 ·6H 2 O was dissolved in a mixed solution of 10 mL oleic acid and 2 mL oleylamine, stirred evenly, and injected into a three-necked flask, and the reaction system was introduced into an inert atmosphere, at 120 o C under reflux for 60 min to remove residual moisture in the reactant and air in the system. Then warm up to 240 oC, and keep warm for 120 min. After the temperature of the system dropped to room temperature, it was centrifuged and washed three times with alcohol. o Dry in a blast oven at C. Put 0.3 g of the dried powder into a tube furnace for carbonization at a temperature of 700 o C, holding time 180 min, heating rate 10 o C / min. The stability of the composite structure carbon network obtained under this condition is average, most of the ZnO is tetrahedral, and a small amount of ZnO is irregular in shape, the size range is about 100-350 nm, the size distribution is wide, and the cycle performance of lithium-ion batteries is good. ...

Embodiment 3

[0030] 1.24 g Zn(NO 3 ) 2 ·6H 2 O was dissolved in the mixed solution of 20 mL oleic acid and 4 mL oleylamine, stirred evenly and poured into a three-necked flask, and the reaction system was introduced into an inert atmosphere, and at 120 o C under reflux for 60 min to remove residual moisture in the reactant and air in the system. Then warm up to 240 o C, and keep warm for 120 min. After the temperature of the system dropped to room temperature, it was centrifuged and washed three times with alcohol. o Dry in a blast oven at C. Put 0.3 g of the dried powder into a tube furnace for carbonization at a temperature of 700 o C, holding time 180 min, heating rate 10 o C / min. Under this condition, the composite structure carbon network obtained has good stability, ZnO crystal shape is irregular, the size range is about 100 nm, and the distribution is relatively uniform. The cycle performance of the lithium-ion battery is average, and the specific capacity performance is goo...

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Abstract

The invention relates to a carbon network supported zinc oxide nanocrystalline composite material and a preparation method and application thereof. A zinc-containing precursor is synthesized by an internal reflux method and is subjected to carbonization treatment at different temperatures in an inert atmosphere. The preparation method comprises the following steps: dissolving zinc nitrate in a mixed solution of oleic acid and oleylamine, and introducing the mixed solution into an inert atmosphere; removing residual moisture in the reactants and air in a system, raising the temperature of the system, and washing and drying a product, thereby obtaining the zinc-containing precursor; performing carbonization treatment in the inert atmosphere, thereby obtaining the carbon skeleton coated zinc oxide nanocrystalline composite material. According to the invention, a surfactant serves as a carbon source, a high-stability carbon network structure is obtained through carbonization, and zinc oxide nanocrystalline particles are uniformly inlaid in the carbon network. The method is easy to operate, is easily controlled and implemented in process and has an environment-friendly effect. The prepared ZnO / C composite material successfully overcomes the defect that zinc oxide is poor in cycle performance in the aspect of lithium ion battery application and has good application prospects.

Description

technical field [0001] The invention belongs to the field of preparation of metal oxide functional materials, in particular to a preparation method of a carbon network-loaded zinc oxide nanocrystal composite material. Background technique [0002] Lithium-ion batteries are widely used in various fields due to their advantages such as high voltage, long life, and recyclability. In recent years, due to environmental factors and the decline of traditional energy sources, the application of lithium-ion batteries in power vehicles has received more attention. The current commercial anode material is mainly graphite, but due to its low specific capacity (372 mAhg -1 ), it has been difficult to meet the energy density requirements of lithium-ion batteries as power. Transition metal oxides due to their high theoretical capacity (generally greater than 600 mAhg -1 ), higher safety, and no pollution have become an emerging material that may replace graphite anodes. Zinc oxide is a...

Claims

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Application Information

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IPC IPC(8): H01M4/48H01M4/62B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00H01M4/366H01M4/483H01M4/625H01M10/0525Y02E60/10
Inventor 王智宇任志敏钱国栋樊先平
Owner ZHEJIANG UNIV
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