期刊
ELECTROCHIMICA ACTA
卷 52, 期 5, 页码 2153-2157出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2006.08.031
关键词
nitroxide polyradical; activated carbon; hybrid capacitor
We present a new concept of the hybrid electrochemical capacitor technology in which a poly (2,2,6,6-tetramethylpiperidinyloxy methacrylate) nitroxide polyradical/activated carbon composite (PTMA-AC) is used as the positive electrode material and activated carbon is used as the negative electrode material. On the positive electrode, both reversible reduction and oxidation of nitroxide polyradical and non-faradic ion sorption/desorption of activated carbon are involved during charge and discharge process. The capacity of the composite electrode is 30% larger than that of the pure activated carbon electrode. A hybrid capacitor fabricated by the PTMA-AC composite positive electrode and the activated carbon negative electrode shows a good cycling life, it can be charged/discharged for over 1000 cycles with slight capacity loss. The hybrid capacitor also has a Good rate capability, it maintains 80% of the initial capacity even at the high discharge current of up to 20C. (c) 2006 Elsevier Ltd. All rights reserved.
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