期刊
ELECTROCHIMICA ACTA
卷 53, 期 28, 页码 8128-8133出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2008.05.080
关键词
carbon-coated; aqueous; electrochemical capacitor; Li2SO4; hybrid
资金
- National Natural Science Foundation of China [20633040]
- 863 program of China [2006AA05Z218]
- State Key Basic Research Program of PRC [2007CB9700]
- Fudan Graduate Innovation Funds
In this work, carbon-coated lithium-ion intercalated compound LiTi2(PO4)(3) and MnO2 have been synthesized and they deliver a capacity of 90 and 60 mAh/g in 1 M Li2SO4 neutral aqueous electrolyte within safe potentials without O-2 and H-2 evolution, respectively. The novel hybrid supercapacitor in which MnO2 Was used as a positive electrode and carbon-coated LiTi2(PO4)3 as a negative electrode was assembled and the LiTi2(PO4)(3)/MnO2 hybrid supercapacitor showed a sloping voltage profile from 0.7 to 1.9 V, at an average voltage near 1.3 V. and delivers a capacity of 36 mAh/g and an energy density of 47 Wh/kg based on the total weight of the active electrode materials. It exhibits a desirable profile and maintains over 80% of its initial energy density after 1000 cycles. The hybrid supercapacitor also exhibit an excellent rate capability, even at a power density of 1000 W/kg, it has a specific energy 25 Wh/kg compared with 43 Wh/kg at the power density about 200 W/kg. (C) 2008 Elsevier Ltd. All rights reserved.
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