Electronic Materials Letters

The Korean Institute of Metals and Materials (대한금속재료학회)
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Synthesis of High-Performance $Li_4Ti_5O_{12}$ and Its Application to the Asymmetric Hybrid Capacitor

  • Published : 2013.11.20
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Abstract

In this work, granule $Li_4Ti_5O_{12}$ was successfully synthesized by spray drying a precursor slurry, followed by the solid-state reaction method. The precursor slurry was prepared from a solution of lithium carbonate ($Li_2CO_3$) and titanium dioxide ($TiO_2$) in deionized water. A hybrid capacitor was fabricated which comprised a granule $Li_4Ti_5O_{12}$ anode and activated carbon cathode. For comparison, an electrical double-layer capacitor (EDLC) cell was fabricated by using activated carbon electrodes in the same way. The electrochemical performance of the hybrid capacitor and the EDLC was characterized by constant current charge/discharge curves and cycle performance testing. The electrochemical testing results showed that the capacitance of the hybrid capacitor is approximately 2.5 times higher than that of the EDLC. Furthermore, the capacitance of the EDLC and the hybrid capacitor barely decreased after 1,000 cycles. The results of this study demonstrate that the hybrid capacitor has the advantages of the high rate capability of a supercapacitor (EDLC) and high battery capacity.

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