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Self-supporting nitrogen-doped carbon nanotube lithium air cell cathode and preparation method thereof

A lithium-air battery, nitrogen hybrid carbon technology, applied in battery electrodes, circuits, electrical components, etc., can solve problems such as rigid failure, increase of battery charge and discharge overpotentials, lithium-air battery cycle performance and rate performance degradation, etc. Achieving good reproducibility and simple process

Inactive Publication Date: 2014-07-09
FUDAN UNIV
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  • Application Information

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Problems solved by technology

As a high-impedance polymer, the binder is used in the lithium-air battery, which greatly increases the overpotential during the charging and discharging process of the battery; its own rigid failure makes the carbon carrier detach from the substrate; the above factors lead to The attenuation of cycle performance and rate performance of lithium-air batteries

Method used

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  • Self-supporting nitrogen-doped carbon nanotube lithium air cell cathode and preparation method thereof
  • Self-supporting nitrogen-doped carbon nanotube lithium air cell cathode and preparation method thereof
  • Self-supporting nitrogen-doped carbon nanotube lithium air cell cathode and preparation method thereof

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Embodiment 1

[0018] (1) Cut the foamed nickel into pole pieces with a diameter of 12 mm with a microtome, wash them alternately in absolute ethanol and deionized water for 20-30 minutes, and dry them in an oven at 70-80 ℃ for later use.

[0019] (2) Place the nickel foam pole piece in the middle of the tube furnace, and place the mixture of 50 mg ferrocene and 750 mg melamine on the top of the foam nickel pole piece near the gas inlet, and place it at 15 ℃ / min in a nitrogen atmosphere. To 550 ℃ and keep for 5 min, then at 15 ℃ / min to 650 ℃ and keep for 15 min; natural cooling to room temperature, you can get the aza-carbon nanotube pole piece, dried in a vacuum oven at 80 ℃ overnight .

[0020] See the immediate view of the product in this embodiment figure 1 a. It can be seen from the figure that the active material (N-CNTs) formed by the CVD method uniformly covers the surface of the base foam nickel.

[0021] The X-ray diffraction data of the product of this example is shown in figure 1 b.

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Abstract

The invention belongs to the technical field of lithium air cells, and particularly relates to a self-supporting nitrogen-doped carbon nanotube lithium air cell cathode and a preparation method thereof. According to the invention, a vapour deposition method is adopted; ferrocene is used as a catalyst; melamine is used as a carbon source and a nitrogen source; and a lithium air cell cathode is obtained by directly growing nitrogen-doped carbon nanotubes on a foamed nickel substrate. The method of the invention is simple in process, and good in reproducibility; the prepared carbon material is stable in structure and uniform in distribution, has a unique multistage channel three dimensional structure, prevents rigidification due to reaction between binders and intermediate products during circulation of the lithium air cell, and separates the carbon carrier from the substrate; the application of polytetrafluoroethylene with high impedance is abandoned, which greatly improves the conductivity of electrode sheets, and reduces overpotential. In addition, the multistage channel structure not only provides a gas-liquid-solid three-phase reaction site, but also accommodates lithium peroxide generated during discharging, and thus improves the electrochemical properties of the cell.

Description

technical field [0001] The invention belongs to the technical field of lithium-air batteries, and in particular relates to a positive electrode of a lithium-air battery with self-supporting nitrogen-hybridized carbon nanotubes and a preparation method thereof. Background technique [0002] Lithium-air batteries (also known as lithium-oxygen batteries) use porous carbon with a high specific surface area as the positive electrode and metallic lithium as the negative electrode. In 1996, K. M. Abraham first reported the lithium / air battery with gel polymer (PAN-PVDF) as the electrolyte. Coulombic efficiency [K. M. Abraham and Z. Jiang, J. Electrochem. Soc., 143 (1996) 1-5]. During the discharge process of lithium-air batteries, O can be directly extracted from the air 2 As a positive electrode active material, the total mass of the battery is greatly reduced, and its discharge specific capacity is as high as 3862 mAh / g, and its theoretical specific capacity is 11140 Wh / kg, whi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/88H01M4/86
CPCH01M4/8605H01M4/8867Y02E60/50
Inventor 余爱水林秀婧周兰黄桃
Owner FUDAN UNIV
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