Sea urchin-like NiCoO2@C nanocomposites for Li-ion batteries and supercapacitors
| Autor: | Paul R. Coxon, Jun Lu, Shujiang Ding, Jin Liang, R. Vasant Kumar, Sheng Chen, Teng Zhao, Hyun Kyung Kim, Kai Xi, Guoqiang Tan, Yuan Yang |
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| Rok vydání: | 2016 |
| Předmět: |
Supercapacitor
Battery (electricity) Materials science Nanocomposite Renewable Energy Sustainability and the Environment chemistry.chemical_element Nanotechnology 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Energy storage Lithium-ion battery 0104 chemical sciences Electrochemical cell chemistry Electrode General Materials Science Electrical and Electronic Engineering 0210 nano-technology Carbon |
| Zdroj: | Nano Energy. 27:457-465 |
| ISSN: | 2211-2855 |
| DOI: | 10.1016/j.nanoen.2016.06.032 |
| Popis: | The rational construction of battery electrode architecture that offers both high energy and power densities on a gravimetric and volumetric basis is a critical concern but achieving this aim is beset by many fundamental and practical challenges. Here we report a new sea urchin-like NiCoO2@C composite electrode architecture composed of NiCoO2 nanosheets grown on hollow concave carbon disks. Such a unique structural design not only preserves all the advantages of hollow structures but also increases the packing density of the active materials. NiCoO2 nanosheets grown on carbon disks promote a high utilization of active materials in redox reactions by reducing the path length for Li+ ions and for electron transfer. Meanwhile, the hollow concave carbon not only reduces the volume change, but also improves the volumetric energy density of the entire composite electrode. As a result, the nanocomposites exhibit superior electrochemical performance measured in terms of high capacity/capacitance, stable cycling performance and good rate capability in both Li-ion battery and supercapacitor applications. Such nanostructured composite electrode may also have great potential for application in other electrochemical devices. |
| Databáze: | OpenAIRE |
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