In:
ECS Meeting Abstracts, The Electrochemical Society, Vol. MA2023-01, No. 5 ( 2023-08-28), p. 877-877
Abstract:
Owing to high safety and low cost, aqueous rechargeable zinc-ion batteries (ZIBs) is currently a major research topic. In this study, we propose the microwave-assisted hydrothermal synthesis of polypyrrole (PPy)-coated Na 1.1 V 3 O 7.9 (P-NVO) nanorods for the first time as a highenergy and high-power cathode material for ZIBs. The highly conductive PPy surface-coating layer is significant to enhance the electronic conductivity and Zn 2+ diffusion kinetics, leading to utilize the V 3+ /V 4+ /V 5+ multiple redox reactions of the NVO cathode in ZIBs. Compared to the NVO cathode, therefore, the P-NVO cathode offers higher discharge capacity, power capability and cycling stability; in particular, PPy coating triggers the full theoretical capacity of the NVO cathode (527 mAh g - 1 with ~ 3 mol Zn insertion per formula unit) and directly reflects a superior energy density of 408 Wh kg -1 . Even at a high current density of 6000 mA g - 1 , the P-NVO cathode sustains 1000 cycles with almost 100% capacity retention. Galvanostatic intermittent titration technique, cyclic voltammetry, in situ X-ray diffraction, and ex situ X-ray absorption near edge structure analyses are combined to verify the superior Zn 2+ storage mechanism of the P-NVO cathode.
Type of Medium:
Online Resource
ISSN:
2151-2043
DOI:
10.1149/MA2023-015877mtgabs
Language:
Unknown
Publisher:
The Electrochemical Society
Publication Date:
2023
detail.hit.zdb_id:
2438749-6
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