A high-performance hybrid supercapacitor with Li4Ti5O12-C nano-composite prepared by in situ and ex situ carbon modification
In this work, we report on the synthesis of in situ and ex situ carbon-modified Li 4 Ti 5 O 12 -C (LTO-C) nano-composite and its application in a hybrid supercapacitor constructed using activated carbon (AC) and LTO-C nano-composite as positive and negative electrodes, respectively. The hybrid capac...
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Published in | Journal of solid state electrochemistry Vol. 16; no. 8; pp. 2791 - 2796 |
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Main Authors | , , , |
Format | Journal Article |
Language | English |
Published |
Berlin/Heidelberg
Springer-Verlag
01.08.2012
|
Subjects | |
Online Access | Get full text |
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Summary: | In this work, we report on the synthesis of in situ and ex situ carbon-modified Li
4
Ti
5
O
12
-C (LTO-C) nano-composite and its application in a hybrid supercapacitor constructed using activated carbon (AC) and LTO-C nano-composite as positive and negative electrodes, respectively. The hybrid capacitors are characterized by galvanostatic charge–discharge, cycle life testing, and electrochemical impedance spectroscopy. The results reveal that the AC/LTO-C hybrid capacitors exhibit high rate capability and long cycle life. In the potential range of 1.5–3.0 V, the AC/LTO-C hybrid system can deliver a specific capacitance of 83 F g
−1
based on the total mass of AC and LTO-C electrodes at a current density of 60 mA g
−1
(2 C rate). At a higher discharge rate of 980 mA g
−1
(32 C), the capacity is 68 F g
−1
, about 82 % of that at 2 C rate. After 9,000 deep cycles at 32 C, the hybrid capacitor still maintains 84 % of its initial capacitance. The specific energy of such hybrid system is 20 Wh kg
−1
, which is at least twice that of an AC/AC system. Combining the high energy density with power capability, the AC/LTO-C hybrid supercapacitor has demonstrated high performance for applications needing high power output. |
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ISSN: | 1432-8488 1433-0768 |
DOI: | 10.1007/s10008-012-1704-9 |