Probing the Sodium Insertion/Extraction Mechanism in a Layered NaVO3 Anode Material
- Probing the Sodium Insertion/Extraction Mechanism in a Layered NaVO3 Anode Material
- 정경윤; 정훈기; 굴람 알리; 모비눌; 남경완
- amorphous-like; kinetic study; NaVO3; sodium diffusion coefficient; solid-state method
- Issue Date
- ACS Applied Materials & Interfaces
- VOL 10, NO 22-18725
- For the realization of sodium-ion batteries (SIBs), high-performance anode materials are urgently required with the advantages of being low-cost and environment-friendly. In this work, layered-type NaVO3 is prepared by the simple solid-state route with a rod-like morphology and used as an anode material for SIBs. The NaVO3 electrode exhibits a high specific capacity of 196 mA h g– 1 during the first cycle and retains a capacity of 125 mA h g– 1 at the 80th cycle with a high Coulombic efficiency of >99%, demonstrating high reversibility. The sodium diffusion coefficient in NaVO3 is measured using electrochemical impedance spectroscopy (1.368 × 10– 15 cm2 s– 1), the galvanostatic intermittent titration technique (1.15715 × 10– 13 cm2 s– 1), and cyclic voltammetry (2.7935 × 10– 16 cm2 s– 1). Furthermore, the reaction mechanism during the sodiation/desodiation process is investigated using in situ X-ray diffraction and X-ray absorption near the edge structure analysis, which suggests the formation of an amorphous-like phase and reversible redox reaction of V4+ ↔ V5+, respectively.
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