期刊
JOURNAL OF MATERIALS CHEMISTRY A
卷 10, 期 21, 页码 11470-11476出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/d2ta01574a
关键词
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资金
- National Natural Science Foundation of China [51772116, 51972132]
- Program for HUST Academic Frontier Youth Team [2016QYTD04]
Sodium-ion capacitors with carbon-bridged Nb2O5 mesocrystals as anode exhibited ultrafast sodium storage capability and high structural stability. The combination of carbon coating/bridging and mesocrystalline design provides superior electronic conductivity and fast redox kinetics. The assembled sodium-ion capacitor showed outstanding electrochemical performance with high energy density and high power density.
Sodium-ion capacitors (SICs) have been considered as low-cost candidates for hybrid energy-storage devices with high power/energy densities. However, kinetics imbalance at high rates between battery-type anodes and capacitor-type cathodes is a significant challenge. Here, we report the synthesis of carbon-bridged Nb2O5 mesocrystals (meso-Nb2O5@C) for sodium storage with ultrafast kinetics through a fast microwave-assisted method and subsequent heat treatment. Such a unique meso-Nb2O5@C electrode exhibits ultrafast sodium storage capability, benefiting from superior electronic conductivity by carbon coating/bridging and fast redox kinetics by mesocrystalline design with abundant boundaries and a uniform nanocrystalline orientation. Furthermore, the long-term cyclability of meso-Nb2O5@C (80.5% capacity retention upon 10 000 cycles at 20C) verifies high structural stability of meso-Nb2O5@C. The as-assembled SIC with a meso-Nb2O5@C anode and an activated carbon cathode displays outstanding electrochemical performance with a high energy density of 28.4 W h kg(-1) at 15 600 W kg(-1). This work demonstrates that engineering carbon-bridged mesocrystals offers an unexpected route towards low-cost, high-energy, and high-power energy storage devices.
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