Revisiting of Tetragonal NaVPO4F: A High Energy Density Cathode for Sodium-Ion Batteries
- 16 June 2020
- journal article
- research article
- Published by American Chemical Society (ACS) in ACS Applied Materials & Interfaces
- Vol. 12 (27), 30510-30519
- https://doi.org/10.1021/acsami.0c08846
Abstract
Tetragonal NaVPO4F has been regarded as an ideal cathode for sodium-ion batteries because of its high average plateau (3.8 V) and theoretical specific capacity (143 mA h g–1). However, the Na-storage performance is still hindered by unsatisfying thermal stability and poor conductivity. Herein, a stable tetragonal NaVPO4F has been synthesized by a novel solvent thermal method using a carbon coating precursor. The as-prepared NaVPO4[email protected] nanocomposite delivers a capacity of 133 mA h g–1 at 0.2 C, corresponding to an excellent energy density of 509 W h kg–1; when coupled with an HC anode, the full cell still displays an outstanding performance of 124 mA h g–1 at 0.05 C. Fast Na+ diffusion kinetics (DNa+ = 10–12 to 10–10 cm2 s–1) and small volume change (4.4%) are exploited, which ensures good rate trait and cycling stability of tetragonal NaVPO4F. Further, the Na+ extraction–insertion mechanism has been explored by analyzing the crystal structure change during in situ X-ray powder diffraction cycles.Funding Information
- Chinese Academy of Sciences (DNL201914, XDA21070500)
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