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
Přispěvatelé: School of Materials Science and Engineering, Energy Research Institute @ NTU (ERI@N)
Jazyk: angličtina
Rok vydání: 2014
Předmět:
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