Low-temperature oxidation preparation method of different carbon-coated nanocrystallines

A nanocrystalline, carbon-coated technology, applied in nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve problems such as inability to promote industrialization, high precursor toxicity, and complex processes

Active Publication Date: 2014-05-14
左成(上海)新材料科技发展股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These methods basically require special equipment, the process is relatively complicated, the reaction time is long, and the organic precursors used are highly toxic.
Moreover, people often coat a layer of carbon material on the surface of the prepared nanocrystal through the above-mentioned process. It is still a technical problem to directly prepare carbon-coated nanocrystals with uniform morphology and structure through one-step reaction.
Therefore, there is still no low-temperature, high-efficiency carbon-coated nano-metal sulfide, metal oxide, and general-purpose, macro-scale preparation method in the world, and it is impossible to promote its industrialization.

Method used

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  • Low-temperature oxidation preparation method of different carbon-coated nanocrystallines
  • Low-temperature oxidation preparation method of different carbon-coated nanocrystallines
  • Low-temperature oxidation preparation method of different carbon-coated nanocrystallines

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Evenly mix 4.65 grams of ferrocene and 12.6 grams of ammonium dichromate, put them into a pressure-dissolving bomb with a volume of 200 milliliters of polytetrafluoroethylene lining, and lock and seal. Heat the pressure melting bomb to 200°C, keep it warm for 1 hour and then cool to room temperature. The obtained black powder was washed with concentrated hydrochloric acid, deionized water and absolute ethanol, and dried to obtain 3.4 g of carbon-coated equiaxed Fe 3 o 4 Nanocrystalline. The carbon-coated equiaxed Fe 3 o 4 The transmission electron microscope photographs of the nanocrystals are as figure 1 As shown, Fe 3 o 4 The nanocrystal is equiaxed, the grain size is concentrated in the range of 20-90nm, the median diameter is 53nm, and the thickness of the carbon shell coated on the surface of the nanocrystal is about 5nm.

Embodiment 2

[0031] Evenly mix 6.1 g of cyclooctatetraenetricarbonyl iron with 11.4 g of ammonium persulfate, put it into a pressure-dissolving bomb with a volume of 200 ml of Teflon lining, and lock and seal it. Heat the pressure melting bomb to 200°C, keep it warm for 1 hour and then cool to room temperature. The obtained black powder was cleaned and dried with deionized water and absolute ethanol to obtain 3.9 g of carbon-coated spherical Fe 3 o 4 Nanocrystalline. The carbon-coated spherical Fe 3 o 4 The transmission electron microscope pictures of the nanocrystals are as figure 2 As shown, Fe 3 o 4 The nanocrystal is spherical, the grain size is concentrated in the range of 5-40nm, the median diameter is 15nm, and the thickness of the carbon shell covered on the surface of the nanocrystal is about 2-5nm.

Embodiment 3

[0033] Evenly mix 4.65 grams of ferrocene, 11.4 grams of ammonium persulfate and 2 grams of sodium chloride, put them into a 200 milliliter polytetrafluoroethylene-lined pressure melt bomb and lock and seal. Heat the pressure melting bomb to 200°C, keep it warm for 1 hour and then cool to room temperature. The obtained black powder was washed with deionized water and absolute ethanol, and dried to obtain 4.1 g of carbon-coated rod-shaped Fe 7 S 8 Nanocrystalline.

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Abstract

The invention discloses a low-temperature oxidation preparation method of different carbon-coated nanocrystallines. The method comprises the steps of 1. preparing reaction raw materials: evenly mixing organic metal pi complex and a strong oxidant which are selected as raw materials, wherein the molar ratio of the strong oxidant to the organic metal pi complex is (1-5):1; 2. arranging the evenly mixed raw material into a pressure-resistant closed reaction container, heating up to 100-240 DEG C, and carrying out heat preservation for 0.5-2h; after the reaction, carrying out aftertreatment to obtain the different carbon-coated nanocrystallines, wherein nanocrystallines are any one or combinations of more than two of metal sulfide, metal oxide and elemental sulfur. The preparation method has the characteristics of simple equipment, easiness in operation, low cost, high efficiency, environmental protection and the like, thus facilitating industrial production; the prepared carbon-coated nanocrystallines have multiple varieties, controllable composition and form and good stability, and have wide application prospect in the fields of a lithium ion battery, a lithium sulphur battery, a supercapacitor, environmental cleaning, drug targeting, wave-absorbing material, etc.

Description

technical field [0001] The invention relates to a low-temperature oxidation preparation method of carbon-coated nanocrystals of different types. Background technique [0002] Due to the continuous depletion of fossil energy, as well as the increasingly serious environmental pollution and smog weather in our country, the development of alternative energy and energy conservation and emission reduction have become the general trend. As the core power source of electric vehicles and the energy storage power source of solar energy and wind energy, governments and enterprises of various countries are trying their best to promote the development of lithium-ion batteries in order to seize the opportunities of new industries. On the other hand, in the field of electric vehicles, the problems of low energy density and high cost of lithium-ion batteries have been plagued by new energy vehicle manufacturers at home and abroad. Sulfur batteries have become a research hotspot, bringing h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/52H01M4/58B82Y30/00
CPCB82Y30/00H01M4/366H01M4/5815H01M10/0525H01M2220/20Y02E60/10
Inventor 刘伯洋陈建伟吴钱林陈海李文戈董丽华尹衍升
Owner 左成(上海)新材料科技发展股份有限公司
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