Journal
NANOSCALE
Volume 10, Issue 46, Pages 21671-21680Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c8nr06458j
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Funding
- National Natural Science Foundation of China [21701107, 51472152, 51672165]
- Doctoral Scientific Research Startup Foundation of Shaanxi University of Science and Technology [2016QNBT-07]
- Platform construction Fund for Imported talent of Shaanxi University of Science and Technology [134080038]
- Undergraduate Innovation and Entrepreneurship Training Program [201610708011]
- 973 Special Preliminary Study Plan [2014CB260411]
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Surface structure plays a decisive role in the surface capacity and electrochemical kinetics of rechargeable batteries. Tuning the surface structure of building blocks has been considered to be a new effective strategy to promote the electrochemical performance of 3D self-assembled nanoarchitectures. Herein, VS4 microspheres assembled from the nano-units with different crystallinities are synthesized via a facile template-free hydrothermal method. The results show that the electrochemical performance of VS4 microspheres as anode materials for sodium-ion batteries (SIBs) largely depends on their crystallinity, and a VS4 electrode with the lowest crystallinity delivers a high reversible capacity of 412 mA h g(-1) at 0.2 A g(-1) after 230 cycles and that of 345 and 293 mA h g(-1) even at 1.0 and 2.0 A g(-1), respectively. The insertion mechanism is revealed within the selected voltage window of 0.50-3.00 V. Further analysis suggests that decreasing the crystallinity of the nano-units can dramatically enhance the pseudocapacitive behavior of VS4 microspheres, which takes the main responsibility for the improvement of sodium storage properties. This work can provide a new insight for the exploration and design of high-performance anodes for SIBs.
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