期刊
JOURNAL OF POWER SOURCES
卷 297, 期 -, 页码 457-463出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jpowsour.2015.08.011
关键词
Sodium ion capacitor; Co-intercalation; Diglyme; Energy storage
资金
- National Natural Science Foundation of China [21271180, 21401208]
- National High Technology Research and Development Program of China (863 Program) [2013AA050905]
- Key Technology Research Projects of Qingdao [13-4-1-10-gx]
- Qingdao Key Lab of solar energy utilization and energy storage technology
A novel sodium-ion capacitor (NIC) was assembled using graphitic mesocarbon microbead anode and activated carbon cathode in diglyme-based electrolyte. Charge/discharge tests indicate that sodium ions can reversibly co-intercalated with diglyme solvent into graphite anode and show good rate performance. The energy densities of the NICs are as high as 93.5 and 86.5 Wh kg(-1) at 573 and 2832 W kg(-1) (equal to 4 C and 50 C) in the voltage window at 1-4 V, respectively. By optimizing the voltage ranges, the capacity retention of the NIC at 20 C is 98.3% even after 3000 cycles. Such superior electrochemical performance should be attributed to the reversible intercalated/deintercalated reaction of sodium ions and the formation of ternary graphite intercalation compounds in diglyme-based electrolyte. The present work pioneers new realms of hybrid energy storage system with high energy density, high power density and long cycle life. (C) 2015 Elsevier B.V. All rights reserved.
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