期刊
NANO-MICRO LETTERS
卷 11, 期 1, 页码 -出版社
SHANGHAI JIAO TONG UNIV PRESS
DOI: 10.1007/s40820-019-0301-1
关键词
Energy storage; Zinc-ion capacitor; Battery-type and capacitor-type electrodes; MXene; Electrochemical performance
资金
- Anhui Provincial Natural Science Foundation [1908085QF251]
- Foundation for the Introduction of High-Level Talents of Anhui University [S020118002/061]
- National Natural Science Foundation of China [11704002]
- Support Project of Outstanding Young Talents in Anhui Provincial Universities [gxyqZD2018006]
Restricted by their energy storage mechanism, current energy storage devices have certain drawbacks, such as low power density for batteries and low energy density for supercapacitors. Fortunately, the nearest ion capacitors, such as lithium-ion and sodium-ion capacitors containing battery-type and capacitor-type electrodes, may allow achieving both high energy and power densities. For the inspiration, a new zinc-ion capacitor (ZIC) has been designed and realized by assembling the free-standing manganese dioxide-carbon nanotubes (MnO2-CNTs) battery-type cathode and MXene (Ti3C2Tx) capacitor-type anode in an aqueous electrolyte. The ZIC can avoid the insecurity issues that frequently occurred in lithium-ion and sodium-ion capacitors in organic electrolytes. As expected, the ZIC in an aqueous liquid electrolyte exhibits excellent electrochemical performance (based on the total weight of cathode and anode), such as a high specific capacitance of 115.1 F g(-1) (1 mV s(-1)), high energy density of 98.6 Wh kg(-1) (77.5 W kg(-1)), high power density of 2480.6 W kg(-1) (29.7 Wh kg(-1)), and high capacitance retention of similar to 83.6% of its initial capacitance (15,000 cycles). Even in an aqueous gel electrolyte, the ZIC also exhibits excellent performance. This work provides an essential strategy for designing next-generation high-performance energy storage devices.
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