title: Unveiling TiNb2 O7 as an insertion anode for lithium ion capacitors with high energy and power density.
abstract: 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.
authors: Energy Research Institute @ NTU (ERI@N), Nanyang Technological University, Singapore 637553 (Singapore). aravind_van@yahoo.com.
authors: Vanchiappan
authors: V
authors: Aravindan
authors: Jayaraman
authors: J
authors: Sundaramurthy
authors: Akshay
authors: A
authors: Jain
authors: Palaniswamy Suresh
authors: PS
authors: Kumar
authors: Wong Chui
authors: WC
authors: Ling
authors: Seeram
authors: S
authors: Ramakrishna
authors: Madapusi P
authors: MP
authors: Srinivasan
authors: Srinivasan
authors: S
authors: Madhavi
mesh_terms: D025802:Electric Capacitance; D011211:Electric Power Supplies; D004566:Electrodes; D008094:Lithium / Q000737:chemistry*; D009556:Niobium / Q000737:chemistry*; D010087:Oxides / Q000737:chemistry*; D014025:Titanium / Q000737:chemistry*
chemical_list: D010087:Oxides; D009556:Niobium; D008094:Lithium; D014025:Titanium
keywords: carbon; electrochemistry; electrospinning; lithium; nanostructures