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Abstract
Nb2O5 nanosheets are successfully synthesized through a facile hydrothermal reaction and followed heating treatment in air. The structural characterization reveals that the thickness of these sheets is around 50 nm and the length of sheets is 500 ~ 800 nm. Such a unique two dimensional structure enables the nanosheet electrode with superior performance during the charge-discharge process, such as high specific capacity (~184 mAh·g−1) and rate capability. Even at a current density of 1 A·g−1, the nanosheet electrode still exhibits a specific capacity of ~90 mAh·g−1. These results suggest the Nb2O5 nanosheet is a promising candidate for high-rate lithium ion storage applications.
Highlights
Nb2O5 nanosheets are successfully synthesized through a facile hydrothermal reaction and followed heating treatment in air
Its intrinsic poor electric conductivity (s, 3 3 1026 S?cm21) and the capacity decay resulted from pulverization during charge-discharge process limit its practical application in lithium ion batteries, and it is still challenging to develop efficient but simple ways to enhance the utilization of electroactive Nb2O515–19
The results indicate the (001) planes are perpendicular to nanosheets, which may provide natural tunnels for lithium ion transport throughout the a–b plane[15], and favour fast intercalation/de-intercalation reaction
Summary
Nb2O5 nanosheets are successfully synthesized through a facile hydrothermal reaction and followed heating treatment in air. Nb2O5 nanobelts and hollow nanospheres were been developed with large capacity and high rate capability[19,20] Among these nanostructures, two dimensional structures with nano size in thickness and micro size in length have been considered to be the appropriate morphology for energy storage[22,23,24,25]. A nano-sized thickness has short ion diffusion path and large surface area; the micro-sized length can lower the internal resistance and facilitate the electron transfer rate as compared with the noncontinuous oxide framework composed of nanoparticles[22,23,24,25] These merits encourage us to investigate Nb2O5 electrode materials with two dimensional structures
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