Synthesis of Na3V2(PO4)2F3@V2O5-x as Cathode Material for Sodium-ion Battery

doi:10.15541/jim20190058

Abstract

Abstract:

Low energy/power density and inferior cycling stability are bottlenecks to restrict the applications of sodium-ion batteries. Recently, coating the surface of cathode material by metal oxides containing oxygen vacancies, was regarded as an effective strategy to improve electrical conductivity and power/energy density. In this study, Na₃V₂(PO₄)₂F₃@V₂O_5-_x nanosheets were synthesized via hydrothermal strategy followed by heat treatment. X-ray diffraction, transmission electron microscopy, scanning electron microscopy, X-ray photoelectron spectroscopy, and thermogravimetric analysis were applied to investigate the structure of Na₃V₂(PO₄)₂F₃@V₂O_5-_x. As a cathode of sodium- ion batteries, Na₃V₂(PO₄)₂F₃@V₂O_5-_x delivers excellent cycling stability and rate capability. It exhibits an initial discharge capacity of 123 mAh?g ^-1 at 0.2C, and a discharge capacity of 109 mAh?g ^-1 after 140 cycles. At 1C, its initial reversible capacity is 72 mAh?g ^-1, which remains 84% after 500 cycles. The outstanding electrochemical property could be ascribed to its enhanced sodium-diffusion and improved electronic conductivity induced by disordered surface coating. Furthermore, it encourages more investigations into practical sodium-ion battery applications.

Key words: cathode material, oxygen deficient, electrochemical performance, sodium-ion battery

CLC Number:

O646

WANG Jia-Hu, WANG Wen-Xin, DU Peng, HU Fang-Dong, JIANG Xiao-Lei, YANG Jian. Synthesis of Na₃V₂(PO₄)₂F₃@V₂O_5-_x as Cathode Material for Sodium-ion Battery[J]. Journal of Inorganic Materials, 2019, 34(10): 1097-1102.

Figures/Tables 5

Fig. 1 XRD patterns of NVPF and NVPF@VO samples

Fig. 2 (a) TEM, (b) SEM, (c) HRTEM images of NVPF@VO, and (d) FT-IR spectra of NVPF and NVPF@VO

Fig. 3 (a) XPS spectrum of V2p of NVPF@VO, (b) XPS spectra of V2p of NVPF@VO sputtered by Ar+ plasmon for different time, (c) mole ratio of V5+/V4+ varied with the sputtering time, and (d) TG curve of NVPF@VO measured at a heating rate of 2 ℃?min-1 in air

Fig. 4 NVPF@VO and NVPF as a cathode material for sodium-ion batteries: charge/discharge profiles of (a) NVPF and (b) NVPF@VO at 0.2C, (c) cycling performance and (d) rate capacity of NVPF and NVPF@VO, and (e) long cycling performances of NVPF@VO and NVPF at 1C

Fig. 5 (a) EIS spectra and (b) relationship between the Zre and ω-1/2 in the low frequency region of NVPF and NVPF@VO

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Synthesis of Na₃V₂(PO₄)₂F₃@V₂O_5-_x as Cathode Material for Sodium-ion Battery

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