期刊
ELECTROCHIMICA ACTA
卷 180, 期 -, 页码 287-294出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2015.08.128
关键词
lithium manganese oxide; asymmetric supercapacitor; energy density
资金
- National Science Foundation of China [51202043, 21571040]
- Fundamental Research Funds for the Central Universities [HEUCFQ20151014]
- Excellent Youth Foundation of Heilongjiang Province of China [JC201210]
- China Scholarship Council (CSC)
Spinel LiMn2O4 has been prepared by a facile hydrothermal procedure and the prepared LiMn2O4 exhibits superior electrochemical performance, such as high specific capacitance (409 F g(-1) at 2 mV s(-1)) and excellent rate capability (85% retention at 100 mV s(-1)). In order to achieve high energy and power densities, a high-voltage asymmetric supercapacitor (ASC) is successfully assembled using the as-prepared LiMn2O4 as the positive electrode and nitrogen-doped graphene/porous carbon composite as the negative electrode in a Li2SO4 aqueous electrolyte. The optimized ASC delivers a high specific energy of up to 44.3 Wh kg(-1) at a specific power of 595 W kg(-1) with an output voltage of 1.8 V based on the total weight of the active electrode materials. This novel strategy provides a promising route to design high-performance supercapacitors with high energy density for next-generation storage systems. (C) 2015 Elsevier Ltd. All rights reserved.
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