Ultrafine carbon nanotubes

Application of ultrafine carbon nanotubes in energy materials Hydrogen storage materials: Calculated based on a 5-seater car driving 500 kilometers, 3.1 kg of hydrogen is required. Calculated based on the normal tank volume, the storage density of hydrogen should be 6.5%. Current hydrogen storage materials cannot meet this requirement. Carbon nanotubes have become the most promising hydrogen storage material due to their pipeline structure and the graphite-like gaps between multi-walled carbon tubes. Foreign scholars have proved that at room temperature and a pressure of less than 1 bar, single-walled carbon tubes can absorb 5%-10% of hydrogen....

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Application of ultrafine carbon nanotubes in energy materials

Hydrogen storage materials: Calculated based on a 5-seater car driving 500 kilometers, 3.1 kg of hydrogen is required. Calculated based on the normal tank volume, the storage density of hydrogen should be 6.5%. Current hydrogen storage materials cannot meet this requirement. Carbon nanotubes have become the most promising hydrogen storage material due to their pipeline structure and the graphite-like gaps between multi-walled carbon tubes. Foreign scholars have proved that at room temperature and a pressure of less than 1 bar, single-walled carbon tubes can absorb 5%-10% of hydrogen.

Based on theoretical calculations and recent repeated verifications, it is generally believed that the reversible storage/release of carbon nanotubes is about 5%. Even 5%, it is the best hydrogen storage material to date.

Lithium-ion batteries: Lithium-ion batteries are developing towards high energy density, and will eventually be equipped with electric vehicles and truly become a green and sustainable energy source for non-fossil power generation for industrial applications. Therefore, materials are required to have high reversible capacity.

The interlayer spacing of carbon nanotubes is slightly larger than that of graphite, and the charge and discharge capacity is greater than that of graphite. Moreover, the cylindrical structure of carbon nanotubes will not collapse after multiple charge-discharge cycles, and has good cyclicity. Alkali metals such as lithium ions and carbon nanotubes have strong interactions. The first discharge capacity of lithium batteries made of carbon nanotubes as negative electrode materials is as high as 1600mAh/g, and the reversible capacity is 700mAh/g, which is much larger than the theoretical reversible capacity of graphite 372mAh/g.

Carbon nanotubes have superb mechanical properties and a large aspect ratio due to their perfect structure, making them the ultimate form for preparing super-strong composite materials. High-strength micron-level carbon fiber composites have been widely used in practice. If we want to make new breakthroughs in strength, we must further reduce the diameter of carbon fibers and increase the aspect ratio.

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