Journal
NANO ENERGY
Volume 68, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.nanoen.2019.104357
Keywords
Sodium-ion battery; NaV6O15; Hydrothermal; In-situ XRD
Categories
Funding
- National Basic Research Program of China (973 Program) [2015CB932600]
- National Key R&D Program of China [2017YFA0208000]
- National Natural Science Foundation of China [21525523, 21722507, 21874121, 21974128, 51902296]
- Research Grants Committee of Hong Kong [T23-407/13-N]
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Na-ion batteries are one of the promising alternative energy storage devices for current Li-ion batteries due to the low cost and similar electrochemistry. The most critical challenge for Na-ion batteries is to develop high-capacity and long-lifespan electrode materials which are comparable to Li-ion batteries. Herein, we use a simple method to prepare nanoflake-constructed microflowers layered sodium vanadium oxide (NaV6O15) via self-assembled process. As cathode material of sodium ion battery, the prepared NaV6O15 microflowers deliver a capacity of 126 mAh g(-1) at 100 mA g(-1). Significantly, the capacity can remain 87% after 2000 cycles at a current density of 5 A g(-1). This superior performance can be attributed to the continuous electron transport pathway, improved electrical conductivity, and excellent stress relaxation, which are revealed by the electrochemical kinetics and structure evolution studies of the material in the cell.
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