Free-Standing Thin Webs of Activated Carbon Nanofibers by Electrospinning for Rechargeable Li–O2 Batteries
| Autor: | Xianfeng Li, Zhang Huamin, Chi Xu, Tao Liu, Nie Hongjiao, Wu Baoshan, Wei Zhou |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
Materials science
Carbon nanofiber Nucleation 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Electrospinning Cathode 0104 chemical sciences law.invention law Nanofiber medicine General Materials Science Composite material 0210 nano-technology Mesoporous material Activated carbon medicine.drug |
| Zdroj: | ACS Applied Materials & Interfaces. 8:1937-1942 |
| ISSN: | 1944-8252 1944-8244 |
| DOI: | 10.1021/acsami.5b10088 |
| Popis: | Free-standing activated carbon nanofibers (ACNF) were prepared through electrospinning combining with CO2 activation and then used for nonaqueous Li-O2 battery cathodes. As-prepared ACNF based cathode was loosely packed with carbon nanofibers complicatedly overlapped. Owing to some micrometer-sized pores between individual nanofibers, relatively high permeability of O2 across the cathode becomes feasible. Meanwhile, the mesopores introduced by CO2 activation act as additional nucleation sites for Li2O2 formation, leading to an increase in the density of Li2O2 particles along with a size decrease of the individual particles, and therefore, flake-like Li2O2 are preferentially formed. In addition, the free-standing structure of ACNF cathode eliminates the side reactions about PVDF. As a result, the Li-O2 batteries with ACNF cathodes showed increased discharge capacities, reduced overpotentials, and longer cycle life in the case of full discharge and charge operation. This provides a novel pathway for the design of cathodes for Li-O2 battery. |
| Databáze: | OpenAIRE |
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