Porous N-doped carbon nanostructure integrated with mesh current collector for Li-ion based energy storage
| Autor: | Jiaqi Yu, Cheng-Hsien Lin, Po-Yuan Cheng, Cheng-Ting Hsieh, Chun-Lung Huang, Shih-Yuan Lu, Heng-Yi Cheng, Xui-Fang Chuah |
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| Rok vydání: | 2019 |
| Předmět: |
Materials science
Nanostructure General Chemical Engineering chemistry.chemical_element 02 engineering and technology General Chemistry Electrolyte 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Industrial and Manufacturing Engineering Energy storage Cathode 0104 chemical sciences Ion law.invention Anode Chemical engineering chemistry law Environmental Chemistry Lithium 0210 nano-technology Power density |
| Zdroj: | Chemical Engineering Journal. 374:201-210 |
| ISSN: | 1385-8947 |
| Popis: | A self-assembled mesoporous silica sphere templating process was developed to create hierarchical continuous porous coral reef like N-doped carbon nanostructures on stainless steel meshes as bifunctional electrodes for ultrahigh performance lithium ion based energy storage devices. The coral reef like carbon nanostructure achieved a high specific surface area of 1229 m2 g−1 and a large specific pore volume of 2.21 cm3 g−1, without application of chemical activations. The electrode, when serving as an anode for lithium ion batteries (LIB) or lithium ion capacitors (LIC), delivered an ultrahigh specific capacity of 2058 mAh g−1 at 0.2 A g−1. If used as a cathode for LICs, it generated a high specific capacity of 125 mAh g−1 at 0.1 A g−1. The LICs assembled from using the electrode as both the cathode and anode, exhibited a high energy density of 145 Wh kg−1 at a power density of 1.4 kW kg−1 and maintained an energy density of 58 Wh kg−1 under an ultrahigh power density of 27.3 kW kg−1, among the top tie of the state-of-the-art LICs. The cycling stability of the LIC was outstanding with a 85% capacity retention after 5000 cycle operations at 5 A g−1. The hierarchical continuous porous coral reef like N-doped carbonaceous nanostructure provides micropores as micro-reservoirs of Li ions for local and fast Li ion intercalation/de-intercalation, edge N-doping for additional redox pseudo-capacitances, and large pore volumes to accommodate the volume expansion/shrinkage at the charge/discharge cycles and to offer fast mass transfer path for electrolyte ions, altogether leading to the successful applications as bifunctional electrodes for Li ion based energy storage devices. |
| Databáze: | OpenAIRE |
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