Search

Your search keyword '"nanocoating"' showing total 452 results
Start Over Descriptor "nanocoating"
452 results on '"nanocoating"'

451. The positive roles of integrated layered-spinel structures combined with nanocoating in low-cost Li-rich cathode Li[Li₀.₂Fe₀.₁Ni₀.₁₅Mn₀.₅₅]O₂ for lithium-ion batteries.

Author

Zhao T, Chen S, Chen R, Li L, Zhang X, Xie M, and Wu F

Abstract

As the most promising cathodes of lithium-ion batteries, lithium-rich manganese-based layered oxides with high capacity suffer from poor cycle stability, poor rate capability, and fast voltage fading. Here we introduced AlF3 into the surface of layered lithium-rich cathode (Li[Li0.2Fe0.1Ni0.15Mn0.55]O2) as an artificial protective layer as well as an inducer of integrated layered-spinel structures to achieve both low cost and high capacity. The reduced irreversible capacity loss, improved cycling stability, and superior high-rate capability were ascribed to the combination of AlF3 nanocoating and the unique structures as well as the low charge transfer resistance. Besides, the intractable issue, fast voltage fading of the layered lithium-rich cathode was also alleviated. Such materials with both low cost and high capacity are considered to be promising candidate cathodes to achieve lithium-ion batteries with high energy and high power.

Published
2014
Full Text
View/download PDF

452. Control of the chemical composition and thickness of deposited coatings over carbon nanotubes using acrylic acid plasma

Author

Pablo González Morones, Ávila Orta, C. A., Navarro Rodríguez, D., and Nelra Velázquez, M. G.

Subjects
Carbon nanotubes, functionalization, hydrophilic, hydrophobic, nanocoating, plasma
Abstract

In this study, it is demonstrated that the surface of carbonnanotubes can be coated with a polymer nanometer size film (nanocoating) with tailored surface polar behavior when treated with acrylic acid plasma. The polar behavior of the polymer nanocoating can be hydrophilic or hydrophobic depending deposition and erosion processes caused by ionized species in the plasma. In turn, deposition and erosion can be controlled by plasma power. Deposition dominates at 20 W power, where a significant amount of polymer nanocoating is produced with carboxylic acid functional groups in the surface thus having an hydrophilic behavior. On the contrary, a smaller amount of polymer nanocoating with hydrophobic behavior (i.e. without any functional groups on its surface) suggests that erosion isthe dominant process when 40 W power is used. Finally, a competition between deposition and erosion processes results in different polar behavior and amount of polymer nanocoating depending of the treatment time.

Catalog

Books, media, physical & digital resources
See catalog results