Unveiling TiNb2O7 as an insertion anode for lithium ion capacitors with high energy and power density
Autor: | Srinivasan Madhavi, Seeram Ramakrishna, Akshay Jain, Palaniswamy Suresh Kumar, Vanchiappan Aravindan, Wong Chui Ling, Jayaraman Sundaramurthy, M.P. Srinivasan |
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Přispěvatelé: | School of Materials Science and Engineering, Energy Research Institute @ NTU (ERI@N) |
Jazyk: | angličtina |
Rok vydání: | 2014 |
Předmět: |
Auxiliary electrode
Materials science Engineering::Materials::Metallic materials [DRNTU] General Chemical Engineering Niobium chemistry.chemical_element Nanotechnology Lithium Electrochemistry Electric Capacitance law.invention Electric Power Supplies law Environmental Chemistry General Materials Science Electrodes Power density Titanium Rietveld refinement Oxides Anode Capacitor General Energy chemistry Chemical engineering Nanofiber |
Popis: | This is the first report of the utilization of TiNb2 O7 as an insertion-type anode in a lithium-ion hybrid electrochemical capacitor (Li-HEC) along with an activated carbon (AC) counter electrode derived from a coconut shell. A simple and scalable electrospinning technique is adopted to prepare one-dimensional TiNb2 O7 nanofibers that can be characterized by XRD with Rietveld refinement, SEM, and TEM. The lithium insertion properties of such electrospun TiNb2 O7 are evaluated in the half-cell configuration (Li/TiNb2 O7 ) and it is found that the reversible intercalation of lithium (≈3.45 mol) is feasible with good capacity retention characteristics. The Li-HEC is constructed with an optimized mass loading based on the electrochemical performance of both the TiNb2 O7 anode and AC counter electrode in nonaqueous media. The Li-HEC delivers very high energy and power densities of approximately 43 Wh kg(-1) and 3 kW kg(-1) , respectively. Furthermore, the AC/TiNb2 O7 Li-HEC delivers a good cyclability of 3000 cycles with about 84% of the initial value. |
Databáze: | OpenAIRE |
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