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Nitrogen-doped graphite carbon serving as anode material of lithium ion battery, and preparation method and application thereof

A graphite carbon and nitrogen doping technology, applied in battery electrodes, circuits, electrical components, etc., to achieve the effects of low cost, easy large-scale production, and convenient operation

Inactive Publication Date: 2011-04-27
QINGDAO INST OF BIOENERGY & BIOPROCESS TECH CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, nitrogen-doped graphene has not been reported as an anode material for lithium-ion batteries.

Method used

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  • Nitrogen-doped graphite carbon serving as anode material of lithium ion battery, and preparation method and application thereof
  • Nitrogen-doped graphite carbon serving as anode material of lithium ion battery, and preparation method and application thereof
  • Nitrogen-doped graphite carbon serving as anode material of lithium ion battery, and preparation method and application thereof

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preparation example Construction

[0026] The preparation method of the nitrogen-doped graphite carbon negative electrode material of the present invention is to use the graphite carbon material as a raw material, place it in a nitrogen-containing small molecule material or a nitrogen-containing small molecule material atmosphere and calcinate for nitriding treatment to obtain lithium ions Nitrogen-doped graphitic carbon as battery anode material.

[0027] The graphite carbon raw material of the present invention is graphite materials such as graphene oxide, reduced graphene, natural graphite, artificial graphite, expanded graphite, or mesocarbon microspheres.

[0028] The nitrogen-containing small molecule material of the present invention is one or more of reactive substances such as pure ammonia, organic amine, organic amine salt, nitrogen, etc., and its volume percentage is 1-99%.

[0029] The nitriding temperature of the present invention is 300-1100° C., and the nitriding time is 0.1-72 hours.

[0030] T...

Embodiment 1

[0039] The artificial graphite is oxidized by the Hummer method to obtain graphite oxide, and then the graphite oxide is reduced with hydrazine hydrate to obtain reduced graphene. Put the prepared reduced graphene into a tube furnace with ammonia / helium / hydrazine mixed gas (ammonia 10%-50%; helium 90%-40%; hydrazine, 0-10%), 700 ℃ for 6 hours to obtain a nitrogen-doped graphene material. The prepared nitrogen-doped graphite material was mixed with conductive carbon black and polyvinylidene fluoride in N-methylpyrrolidone according to the mass ratio of 85:10:5, and evenly coated on the copper foil current collector, and vacuum-dried at 120°C. The negative pole piece was obtained, and then assembled into a coin cell in a glove box for testing. The capacity obtained by the test is 750mAh / g, and the charge-discharge curve diagram of the obtained material is shown in figure 1 .

Embodiment 2

[0041] The graphene material prepared in Example 1 was put into a tube furnace with mixed gas of ammonia / acrylamine, and calcined at 800° C. for 2 hours to obtain a nitrogen-doped graphene material. The prepared nitrogen-doped graphene material was mixed with conductive carbon black and polyvinylidene fluoride in N-methylpyrrolidone according to the mass ratio of 85:10:5, and evenly coated on the copper foil current collector, and vacuum-dried at 120°C , to obtain the negative electrode sheet, and then assembled into a button battery in a glove box for testing. The graphene nitride prepared by the method has a specific capacity of 1150 mAh / g when the current density is 42 mA / g, and a specific capacity of 440 mAh / g when the current density is 210 mA / g. The rate performance and cycle performance graphs of the obtained materials are shown in figure 2 .

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Abstract

The invention discloses a nitrogen-doped graphite carbon, which is obtained by calcining a graphite carbon material in a nitrogen-containing micromolecule material or atmosphere of the nitrogen-containing micromolecule material. When a pole piece which is prepared from the nitrogen-doped graphite carbon material is used as an electrode material of the lithium ion battery, the specific capacity of the material reaches 450 to 1,100mAh / g, and the material has high multiplying power performance and cycle performance. A preparation method of the nitrogen-doped graphite carbon is convenient to operate, and is easy and practicable; the prepared material has stable and excellent performance, and is the anode material of the lithium ion battery, which has good application prospect.

Description

technical field [0001] The invention belongs to the technical field of energy materials and electrochemistry, and in particular relates to nitrogen-doped graphite carbon, a negative electrode material of a lithium ion battery. [0002] The present invention also relates to a method for preparing the above-mentioned nitrogen-doped graphitic carbon. [0003] The invention also relates to the use of the nitrogen-doped graphitic carbon described above. Background technique [0004] Anode materials are one of the key materials of lithium-ion batteries, and carbonaceous materials are the first materials that people began to study and apply to the anode of lithium-ion batteries, and they are still widely concerned. Graphite is one of the earliest and most studied carbon materials for lithium-ion batteries. It has a complete layered crystal structure with a layer spacing of 0.335nm. Lithium intercalates into graphite to form Li x C 6 interlayer compound. When x=1, that is, the f...

Claims

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Application Information

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IPC IPC(8): H01M4/38H01M4/1393
CPCY02E60/122Y02E60/12Y02E60/10
Inventor 崔光磊王海波王丽韩鹏献刘志宏姚建华徐红霞朱玉伟
Owner QINGDAO INST OF BIOENERGY & BIOPROCESS TECH CHINESE ACADEMY OF SCI
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