Carbon coated nano-LiTi2(PO4)3 electrode for non-aqueous hybrid supercapacitors
Reddy, M. V.
Rao, G. V. Subba
Chowdari, Bobba V. R.
Date of Issue2012
School of Materials Science and Engineering
Energy Research Institute @ NTU (ERI@N)
Pechini type polymerizable complex decomposition method is employed to prepare LiTi2(PO4)3 at 1000 °C in air. High energy ball milling followed by carbon coating by the glucose-method yielded C-coated nano-LiTi2(PO4)3 (LTP) with a crystallite size of 80(±5) nm. The phase is characterized by X-ray diffraction, Rietveld refinement, thermogravimetry, SEM, HR-TEM and Raman spectra. Lithium cycling properties of LTP show that 1.75 moles of Li (121 mA h g−1 at 15 mA g−1 current) per formula unit can be reversibly cycled between 2 and 3.4 V vs. Li with 83% capacity retention after 70 cycles. Cyclic voltammograms (CV) reveal the two-phase reaction mechanism during Li insertion/extraction. A hybrid electrochemical supercapacitor (HEC) with LTP as negative electrode and activated carbon (AC) as positive electrode in non-aqueous electrolyte is studied by CV at various scan rates and by galvanostatic cycling at various current rates up to 1000 cycles in the range 0–3 V. Results show that the HEC delivers a maximum energy density of 14 W h kg−1 and a power density of 180 W kg−1.
Physical chemistry chemical physics
© 2012 Royal Society of Chemistry. This is the author created version of a work that has been peer reviewed and accepted for publication by Physical Chemistry Chemical Physcis, Royal Society of Chemistry. It incorporates referee’s comments but changes resulting from the publishing process, such as copyediting, structural formatting, may not be reflected in this document. The published version is available at: [DOI: http://dx.doi.org/10.1039/C2CP40603A ]