Spherical cobalt/cobalt oxide - Carbon composite anodes for enhanced lithium-ion storage
| Autor: | Vilas G. Pol, Valentin S. Teodorescu, Greta Patrinoiu, R. Birjega, Oana Carp, Jose M. Calderon-Moreno, Simona Somacescu, Vinodkumar Etacheri, Chulgi Nathan Hong, Dana C. Culita |
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| Rok vydání: | 2018 |
| Předmět: |
Materials science
General Chemical Engineering chemistry.chemical_element Nanoparticle 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences Anode chemistry Amorphous carbon Chemical engineering Electrochemistry Lithium 0210 nano-technology Inert gas Cobalt oxide Cobalt Carbon |
| Zdroj: | Electrochimica Acta. 264:191-202 |
| ISSN: | 0013-4686 |
| Popis: | Herein we report a simple and scalable route to synthesize porous cobalt/cobalt oxide - carbon sphere composites as anode material for rechargeable lithium-ion batteries. It involves the impregnation of starch-derived hydrochar spheres with a cobalt salt, followed by a heat treatment (700 °C) under inert atmosphere. The obtained high surface area (∼670 m 2 g −1 ), submicron spheres (∼300 nm diameter) with high-degree of microporosity (81%) consist of an amorphous carbon matrix with embedded Co/CoO nanoparticles (∼6 nm sized), having a total cobalt content of 6.2 wt%. The hybrid sphere anodes demonstrated superior specific capacity, rate performance and cycling stability. Discharge capacities of 520 and 310 mA h g −1 are observed at charge-discharge rates of 0.1 and 1C respectively. No significant capacity fading is identified on prolonged cycling at various current densities. The electrode also demonstratedexcellent structural stability during extended charge-discharge processes. |
| Databáze: | OpenAIRE |
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