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Electrochemical Performance of Lithium-Ion Hybrid Supercapacitors based on Activated Carbon and Nanoplatelet Li4Ti5O12 Insertion Electrode Synthesized by Nanoscission Technique

Published online by Cambridge University Press:  16 March 2015

Sandeep Singh ,
Alok C Rastogi ,
Fredrick Omenya ,
M Stanley Whittingham ,
Archit Lal  and
Shailesh Upreti
Sandeep Singh
Affiliation:
Electrical and Computer Engineering, Binghamton University, Binghamton, NY 13902, U.S.A Center for Autonomous Solar Power, Binghamton University, Binghamton, NY 13902, U.S.A
Alok C Rastogi
Affiliation:
Electrical and Computer Engineering, Binghamton University, Binghamton, NY 13902, U.S.A Center for Autonomous Solar Power, Binghamton University, Binghamton, NY 13902, U.S.A
Fredrick Omenya
Affiliation:
Chemistry Department, Binghamton University, Binghamton, NY 13902, U.S.A
M Stanley Whittingham
Affiliation:
Chemistry Department, Binghamton University, Binghamton, NY 13902, U.S.A
Archit Lal
Affiliation:
Primet Precision Materials, Inc., 950 Danby Road, Suite 90, Ithaca, NY 14850, U.S.A
Shailesh Upreti
Affiliation:
Primet Precision Materials, Inc., 950 Danby Road, Suite 90, Ithaca, NY 14850, U.S.A
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Abstract

Electrochemical performance of hybrid supercapacitor (HSC) utilizing surface sculpted Li4Ti5O12 (LTO) insertion electrode having nanoplatelet-like morphology and activated carbon (AC) electrode is investigated for energy storage application. Cyclic voltammetry (CV) at variable scan rates 0.5 to 60 mV.s-1 in the 0-3.2 V range show pseusocapacitive behavior and fast rate of current change indicating rapid Faradaic kinetics. Nyquist impedance study show charge transfer resistance due to kinetic effects of electron transfer and Li+ de-intercalation process at the LTO anode. Low capacity (0.2 C-1C) charge-discharge (CD) curves show high Coulomb efficiency with marginal reduction at high 5-10 C rates due to irreversibility of adsorbed PF6 anions at the electrolyte-AC interface. Galvanostatic CD cycling tests over 50 cycles at different C-rates show decline in storage capacity due to electrode polarization effects. Reduction, broadening and shift of the Raman line at 678 cm-1 from Ti-O bonds in TiO6 octahedra after cycling indicates Li insertion reactions in functioning of hybrid supercapacitor. The hybrid supercapacitor cells have shown energy density, 29 Wh.kg-1 and power density, 350 W.kg-1.

Keywords

energy storagenanoscaleion-solid interactions
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1740: Symposium Z – Materials Challenges for Energy Storage across Multiple Scales , 2015 , mrsf14-1740-z03-01
Copyright
Copyright © Materials Research Society 2015 

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References

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