Highly bonded T-Nb2O5/rGO nanohybrids for 4 V quasi-solid state asymmetric supercapacitors with improved electrochemical performance
- 35 Downloads
T-Nb2O5/reduced graphene oxide nanohybrids were fabricated via the hydrothermal attachment of Nb2O5 nanowires to dispersed graphene oxide nanosheets followed by a high-temperature phase transformation. Electrochemical measurements showed that the nanohybrid anodes possessed enhanced reversible capacity and superior cycling stability compared to those of a pristine T-Nb2O5 nanowire electrode. Owing to the strong bonds between graphene nanosheets and T-Nb2O5 nanowires,the nanohybrids achieved an initial capacity of 227 mAh·g−1. Additionally, non-aqueous asymmetric supercapacitors (ASCs) were fabricated with the synthesized nanohybrids as the anode and activated carbon as the cathode. The 3 V Li-ion ASC with a LiPF6-based organic electrolyte achieved an energy density of 45.1 Wh·kg−1 at 715.2 W·kg−1. The working potential could be further enhanced to 4 V when a polymer ionogel separator (PVDF-HFP/LiTFSI/EMIMBF4) and formulated ionic liquid electrolyte were employed. Such a quasi-solid state ASC could operate at 60 °C and delivered a maximum energy density of 70 Wh·kg−1 at 1 kW·kg−1.
Keywordssolid-state supercapacitor nanohybrid electrode ionogel polymer electrolyte electrochemical performance
Unable to display preview. Download preview PDF.
The National Key Research and Development Program of China (No. 2016YFB0100303), International Cooperation and Exchange of the National Natural Science Foundation of China (No. 51561145020), Instrument and Equipment Research and Development Project of CAS (No. YZ201221), and CAS/SAFEA International Partnership Program for Creative Research Team (No. 20140491518).
- Yu, X. L.; Zhan, C. Z.; Lv, R. T.; Bai, Y.; Lin, Y. X.; Huang, Z. H.; Shen, W. C.; Qiu, X. P.; Kang, F. Y. Ultrahigh-rate and high-density lithium-ion capacitors through hybriding nitrogen-enriched hierarchical porous carbon cathode with prelithiated microcrystalline graphite anode. Nano Energy 2015, 15, 43–53.CrossRefGoogle Scholar
- Kong, L. P.; Zhang, C. F.; Zhang, S. M.; Wang, J. T.; Cai, R.; Lv, C. X.; Qiao, W. M.; Ling, L. C.; Long, D. H. High-power and high-energy asymmetric supercapacitors based on Li+ intercalation into a T-Nb2O5/graphene pseudocapacitive electrode. J. Mater. Chem. A 2014, 2, 17962–17970.CrossRefGoogle Scholar
- Ma, G. Q.; Li, K.; Li, Y. Y.; Gao, B.; Ding, T. P.; Zhong, Q. Z.; Su, J.; Gong, L.; Chen, J.; Yuan, L. Y. et al. High-performance hybrid supercapacitor based on graphene-wrapped mesoporous T-Nb2O5 nanospheres anode and mesoporous carbon-coated graphene cathode. ChemElectroChem 2016, 3, 1360–1368.CrossRefGoogle Scholar
- Tian, W. Q.; Gao, Q. M.; Tan, Y. L.; Yang, K.; Zhu, L. H.; Yang, C. X.; Zhang, H. Bio-inspired beehive-like hierarchical nanoporous carbon derived from bamboo-based industrial by-product as a high performance supercapacitor electrode material. J. Mater. Chem. A 2015, 3, 5656–5664.CrossRefGoogle Scholar
- Lim, E.; Jo, C.; Kim, M. S.; Kim, M. H.; Chun, J.; Kim, H.; Park, J.; Roh, K. C.; Kang, K.; Yoon, S. et al. High-performance sodium-ion hybrid supercapacitor based on Nb2O5@carbon core-shell nanoparticles and reduced graphene oxide nanocomposites. Adv. Funct. Mater. 2016, 26, 3711–3719.CrossRefGoogle Scholar