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Nitrogen-doped carbon nanosheet and preparation method thereof, lithium-ion battery electrode, lithium-ion battery and electric device

A lithium-ion battery, nitrogen-doped carbon technology, applied in the direction of battery electrodes, nano-carbon, nano-technology, etc., can solve the problems of low overall use value, poor electrochemical performance, difficult to control the morphology and structure, and achieve favorable Control of topography structure, controllable topography size, enrichment effect of surface-driven charge storage behavior

Active Publication Date: 2021-07-30
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, the doped carbon material prepared by the existing preparation method is not easy to control the morphology and structure, and its electrochemical performance is not good when used as an electrode material, which needs to be further improved
[0003] Petroleum asphalt is a by-product of crude oil processing, which is cheap and easy to obtain. It is usually used in transportation, construction, water conservancy and other fields, but its overall utilization value is low

Method used

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  • Nitrogen-doped carbon nanosheet and preparation method thereof, lithium-ion battery electrode, lithium-ion battery and electric device
  • Nitrogen-doped carbon nanosheet and preparation method thereof, lithium-ion battery electrode, lithium-ion battery and electric device
  • Nitrogen-doped carbon nanosheet and preparation method thereof, lithium-ion battery electrode, lithium-ion battery and electric device

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preparation example Construction

[0055] According to one aspect of the present invention, a method for preparing nitrogen-doped carbon nanosheets provided comprises the following steps:

[0056] The mixture of petroleum pitch, melamine and molten salt was calcined in a protective atmosphere to obtain nitrogen-doped carbon nanosheets.

[0057] The invention provides a method for preparing nitrogen-doped carbon nanosheets. In the preparation method, petroleum pitch is used as a carbon source, melamine is used as a nitrogen source, and a molten salt reaction medium is used to prepare nitrogen-doped carbon nanosheets.

[0058] The petroleum asphalt has a complex structure and a large molecular weight, but its residual carbon value is very high, and it can be used as a carbon source in the present invention to realize high-value utilization of the petroleum asphalt.

[0059] Melamine, also known as melamine and melamine, is a triazine-type nitrogen-containing heterocyclic organic compound, which has a large amount...

Embodiment approach

[0069] As an optional embodiment of the present invention, the molten salt includes a binary molten salt with a melting point of 500-650°C;

[0070] Preferably, the binary molten salt is any one or a combination of at least two of potassium chloride-calcium chloride, sodium chloride-potassium chloride, magnesium chloride-calcium chloride or calcium chloride-manganese chloride.

[0071] It should be noted that "-" means "and", that is, potassium chloride-calcium chloride is a binary molten salt mixed with potassium chloride and calcium chloride, and sodium chloride-potassium chloride is sodium chloride Binary molten salt mixed with potassium chloride, magnesium chloride-calcium chloride is a binary molten salt mixed with magnesium chloride and calcium chloride, calcium chloride-manganese chloride is a binary molten salt mixed with calcium chloride and manganese chloride .

[0072] The above-mentioned binary molten salt, the eutectic point of the two salts in the molten salt ca...

Embodiment 1

[0117] This embodiment provides a method for preparing nitrogen-doped carbon nanosheets, comprising the following steps:

[0118] (a) Provide a mixture of petroleum asphalt, melamine and molten salt (mass ratio is 1:1:20);

[0119] 0.5g petroleum pitch, 0.5g melamine and 10g binary molten salt (KCl-CaCl 2 , mass ratio 2:1) pre-mixed in an agate mortar, and then the above-mentioned mixture was added to a planetary ball mill for ball milling, the ball milling speed was 800r / min, the ball milling time was 30min, the ball powder mass ratio was 10:1, ball milling Finally, a mixture of petroleum asphalt, melamine and molten salt is obtained;

[0120] Wherein, petroleum asphalt is purchased from Sinopec Company, and petroleum asphalt comprises the component of following mass fraction: saturated content 5%, aromatic content 27%, colloid 48% and asphaltenes 20%;

[0121] (b) Calcining the mixture of petroleum pitch, melamine and molten salt in a corundum boat, raising the temperature...

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Abstract

The invention provides a nitrogen-doped carbon nanosheet and a preparation method thereof, a lithium-ion battery electrode, a lithium-ion battery and an electric device, and relates to the technical field of lithium-ion battery materials. The method for preparing nitrogen-doped carbon nanosheets provided by the present invention uses petroleum pitch as a carbon source, melamine as a nitrogen source, and molten salt as a reaction medium to obtain nitrogen-doped carbon nanosheets by calcining; wherein, petroleum pitch is used as a carbon source , can realize its high-value utilization, melamine is used as a nitrogen source for nitrogen doping, which can make a large number of defect vacancies and dangling bonds around nitrogen, effectively enhance the amorphous degree of nitrogen-doped carbon nanosheets, and form a wider interlayer spacing. Provide a large number of active sites; molten salt provides a stable and uniform liquid environment for the calcination of petroleum pitch and melamine, which is beneficial to the control of the morphology of nitrogen-doped carbon nanosheets. The present invention also provides nitrogen-doped carbon nanosheets, which are prepared by the above-mentioned preparation method. The nitrogen-doped carbon nanosheets are flake-shaped and have controllable appearance.

Description

technical field [0001] The invention relates to the technical field of lithium-ion battery materials, in particular to a nitrogen-doped carbon nanosheet and a preparation method thereof, a lithium-ion battery electrode, a lithium-ion battery and an electric device. Background technique [0002] With the rapid development of the economy and the rapid consumption of traditional fossil fuels, people are increasingly demanding energy storage equipment and operating technologies with high performance, low cost, and green environmental protection. Lithium-ion batteries have become one of the promising energy storage devices due to their high energy density and long cycle life, and have attracted widespread attention from academia and industry. However, the current theoretical specific capacity of graphite anodes for commercial lithium-ion batteries is only 372mAh g -1 , the low specific capacity limits its use in high-power and large-scale energy storage, and it is difficult to m...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B32/15B82Y30/00B82Y40/00H01M4/133H01M4/36H01M4/587H01M10/0525
CPCB82Y30/00B82Y40/00C01P2002/72C01P2002/82C01P2002/85C01P2004/04C01B32/15H01M4/133H01M4/362H01M4/587H01M10/0525Y02E60/10
Inventor 吴明铂彭婷月王宜先潘磊关露谭晓洁宁汇
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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