期刊
ACS APPLIED MATERIALS & INTERFACES
卷 9, 期 37, 页码 31861-31870出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.7b08778
关键词
sodium-ion capacitor; anode; energy storage; NaTi2(PO4)(3); mesocrystal; iso-oriented growth
资金
- National Natural Science Foundation of China [5112508, 11274392, U1401241, 51602354]
Sodium-ion capacitors (SIC) combine the merits of both high-energy batteries and high-power electro-chemical capacitors as well as the low cost and high safety. However, they are also known to suffer from the severe deficiency of suitable electrode materials with high initial Coulombic efficiency (ICE) and kinetic balance between both electrodes. Herein, we report a facile solvothermal synthesis of NaTi2(PO4)(3) nanocages constructed by iso-oriented tiny nanocrystals with a mesoporous architecture. It is notable that the NaTi2(PO4)(3) mesocrystals exhibit a large ICE of 94%, outstanding rate capability (98 mA h g(-1) at 10 C), and long cycling life (over 77% capacity retention after 10 000 cycles) in half cells, all of which are in favor to be utilized into a full cell. When assembled with commercial activated carbon to an SIC, the system delivers an energy density of 56 Wh kg(-1) at a power density of 39 W kg(-1). Even at a high current rate of 5 A g(-1) (corresponds to finish a full charge/discharge process in 2 min), the SIC still works well after 20 000 cycles without obvious capacity degradation. With the merits of impressive energy/power densities and longevity, the obtained hybrid capacitor should be a promising device for highly efficient energy storage systems.
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