Pseudocapacitance of MXene nanosheets for high-power sodium-ion hybrid capacitors

被引:1071
|
作者
Wang, Xianfen [1 ]
Kajiyama, Satoshi [1 ]
Iinuma, Hiroki [1 ]
Hosono, Eiji [2 ]
Oro, Shinji [3 ]
Moriguchi, Isamu [3 ]
Okubo, Masashi [1 ,4 ]
Yamada, Atsuo [1 ,4 ]
机构
[1] Univ Tokyo, Sch Engn, Dept Chem Syst Engn, Bunkyo Ku, Tokyo 1138656, Japan
[2] Natl Inst Adv Ind Sci & Technol, Tsukuba, Ibaraki 3058568, Japan
[3] Nagasaki Univ, Grad Sch Engn, Nagasaki 8528521, Japan
[4] Kyoto Univ, ESICB, Nishikyo Ku, Kyoto 6158510, Japan
来源
NATURE COMMUNICATIONS | 2015年 / 6卷
关键词
TITANIUM CARBIDE; ENERGY-STORAGE; LONG-LIFE; ANODE; INTERCALATION; TRANSITION; COMPOSITE; BATTERIES; OXIDE;
D O I
10.1038/ncomms7544
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
High-power Na-ion batteries have tremendous potential in various large-scale applications. However, conventional charge storage through ion intercalation or double-layer formation cannot satisfy the requirements of such applications owing to the slow kinetics of ion intercalation and the small capacitance of the double layer. The present work demonstrates that the pseudocapacitance of the nanosheet compound MXene Ti2C achieves a higher specific capacity relative to double-layer capacitor electrodes and a higher rate capability relative to ion intercalation electrodes. By utilizing the pseudocapacitance as a negative electrode, the prototype Na-ion full cell consisting of an alluaudite Na2Fe2(SO4)(3) positive electrode and an MXene Ti2C negative electrode operates at a relatively high voltage of 2.4V and delivers 90 and 40 mAh g(-1) at 1.0 and 5.0 Ag-1 (based on the weight of the negative electrode), respectively, which are not attainable by conventional electrochemical energy storage systems.
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页数:6
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