Journal
JOURNAL OF CENTRAL SOUTH UNIVERSITY
Volume 27, Issue 12, Pages 3625-3636Publisher
JOURNAL OF CENTRAL SOUTH UNIV
DOI: 10.1007/s11771-020-4570-0
Keywords
lithium-ion battery; Nb2O5; hexagonal porous sheet; electrochemical performance
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Hexagonal porous Nb2O5 was synthesized for the first time via a facile solid-state reaction. The structure and electrochemical properties have been optimized through tuning heating temperature. X-ray diffraction results indicate that pseudo hexagonal Nb2O5 (TT-Nb2O5) and orthorhombic Nb2O5 have been synthesized at different temperatures. Hexagonal sheet and porous structure of Nb2O5 were characterized by scanning electron microscopy and N-2-adsorption-desorption isotherms. The as-prepared TT-Nb2O5 (heated at 600 degrees C) shows the best performance with a remarkable charge capacity of 178 mA center dot h/g at 0.2C, which is higher than that of T-Nb2O5. Even at 20C, TT-Nb2O5 offers unprecedented rate capability up to 86 mA center dot h/g. The high rate capacity is due to pseudocapacitive Li+ intercalation mechanism of TT-Nb2O5. The reported results demonstrate that Nb2O5 with good crystal structure and high specific surface area is a powerful composite design for high-rate and safe anode materials.
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