High-performance hybrid supercapacitor based on pure and doped Li4Ti5O12 and graphene
| Autor: | K. Faisal, Mohamed Khairy, Mousa |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
Materials science
chemistry.chemical_element Nanotechnology 02 engineering and technology engineering.material 010402 general chemistry 01 natural sciences Capacitance law.invention law Electrochemistry General Materials Science Electrical and Electronic Engineering Supercapacitor Graphene Doping Spinel 021001 nanoscience & nanotechnology Condensed Matter Physics 0104 chemical sciences Anode chemistry Chemical engineering engineering Lithium Cyclic voltammetry 0210 nano-technology |
| Zdroj: | Journal of Solid State Electrochemistry. 21:873-882 |
| ISSN: | 1433-0768 1432-8488 |
| DOI: | 10.1007/s10008-016-3433-y |
| Popis: | Graphene nanosheets (G) and pure, as well as doped Mg-, Mn-, V-Li4Ti5O12, spinel structure have been synthesized. As-prepared materials were characterized by X-ray powder diffraction (XRD), FT-IR, scanning electron microscopy (SEM), cyclic voltammetry, and constant current discharge methods. The physical properties, as well as the possible role of the doped materials in supercapacitors, have been studied. The hybrid supercapacitor with pure or doped Li4Ti5O12 (LTO) anode was fabricated afterward to form the graphene/Li4Ti5O12. The specific energy, specific power, fast-charge capability, lifecycle, and self-discharge of the studied devices were compared. Metal doping did not change the phase structure while remarkably improved its capacitance at high charge/discharge rate. The hybrid supercapacitor utilizing pure or doped Li4Ti5O12 as an anode exhibits high capacitance compared to DLC because of the electrochemical process with intercalation/deintercalation of lithium into the spinel LTO. The capacitance of the hybrid supercapacitor decreases from 207 to 108 Fg−1 when discharged at several specific current densities ranging from 1 to 10 Ag−1. In contrast, the capacitance of the DLC is slightly decreased. |
| Databáze: | OpenAIRE |
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