Highly [001]-oriented N-doped orthorhombic Nb<sub>2</sub>O<sub>5</sub> microflowers with intercalation pseudocapacitance for lithium-ion storage

Liu, Guangyin; Liu, Shanshan; Chen, Hao; Luo, Xinwei; Li, Xiu; Ma, Jianmin

doi:10.1039/d2nr03187f

Cited by 10 publications

(5 citation statements)

References 68 publications

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“…The calculated d -spacing is approximately 0.31 nm, which corresponds to the (180) plane of the orthorhombic Nb 2 O 5 structure. 19 In comparison, the NbO8 sample lattice shows significant distortion and numerous dislocations in the structure. The d -spacing in the strained region is approximately 0.29 nm, suggesting a compressive nature of the strain.…”

Section: Resultsmentioning

confidence: 99%

Evidence of oxygen vacancy-mediated ultrahigh SERS sensitivity of Niobium pentoxide nanoparticles through defect engineering: theoretical and experimental studies

Ghosal,

Bora,

Giri

2024

Nanoscale

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Section: Resultsmentioning

confidence: 99%

Evidence of oxygen vacancy-mediated ultrahigh SERS sensitivity of Niobium pentoxide nanoparticles through defect engineering: theoretical and experimental studies

Ghosal,

Bora,

Giri

2024

Nanoscale

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“…Where i is the peak current (A) of the oxidation/reduction reaction at different scan rates, and v is the corresponding scan rate (mV s À 1 ). a and b are correlation coefficients, which can be determined from the linear fitting of the Log (i) vs. Log(v) through Equation [35][36][37] (3):…”

Section: Resultsmentioning

confidence: 99%

Surface Nitriding Enables Improved Intercalation Pseudocapacitance of T−Nb2O5 for Lithium‐Ion Batteries

Fang,

Zhang,

Yang

et al. 2024

Batteries & Supercaps

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The low electrical conductivity limits the application of T‐Nb2O5 as anode materials for practical applications. The large‐grain T‐Nb2O5 nanowires with nitrogen doping are obtained by simple hydrothermal and annealing treatments. After nitriding with ammonia, an amorphous layer of NbON as an intermediate is formed and then the new crystalline NbN is generated with the deepening of the nitriding degree, causing homogeneous pores on the surface of the T‐Nb2O5 and thus increasing the specific surface area. Meanwhile, the formation of the nitriding layer enhances the electrical conductivity, inducing a pseudo‐capacitance mechanism. Therefore, the N‐T‐Nb2O5 nanowire demonstrates superior electrochemical performance. Specifically, the 45N‐T‐Nb2O5 nanowires delivered a first reversible specific capacity of 238.33 mAh g‐1 at 0.1C, higher than of theoretical capacity (201.6 mAh g‐1). However, the excessive nitride will be completely converted into NbN, reducing the initial lithium storage of the material due to the lack of a lithium storage site, which has not been previously discussed. Besides, at the high rate of 100 C, with the deepening of nitride degree of the T‐Nb2O5, the higher the rate performance. Therefore, to find the balance between the high rate performance and the initial lithium storage amount, the nitride degree should be strictly controlled.

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“…Heteroatom doping has been considered as an effective strategy to improve the intrinsic conductivity and electrochemical properties of electrode materials . Doping ions with different atomic radii could induce lattice distortion, change the unit cell structure, expand the lattice channels, and increase the ion diffusion coefficient, thus enhancing the conductivity and electrochemical performance of the electrode materials. − Cu exhibits excellent electronic conductivity and considerable electrochemical catalytic function because of the special electronic configuration of the Cu atom (3d 10 4s 1 ); thus, Cu doping would facilitate to generate the impurity energy band and shorten the band gap width. − Chen et al reported that the Cu-doped CoO displayed excellent rate performance and cycle life, while Chen et al also demonstrated the enhanced electron conductivity and improved cycle/rate performance of Li 4 Ti 5 O 12 –TiO 2 via Cu doping …”

Section: Introductionmentioning

confidence: 99%

Enhancing the Lithium Storage Performance of the Nb₂O₅ Anode via Synergistic Engineering of Phase and Cu Doping

Dong,

Yao,

et al. 2024

ACS Appl. Mater. Interfaces

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Nb 2 O 5 has been viewed as a promising anode material for lithium-ion batteries by virtue of its appropriate redox potential and high theoretical capacity. However, it suffers from poor electric conductivity and low ion diffusivity. Herein, we demonstrate the controllable fabrication of Cu-doped Nb 2 O 5 with orthorhombic (T− Nb 2 O 5 ) and monoclinic (H−Nb 2 O 5 ) phases through annealing the solvothermally presynthesized Nb 2 O 5 precursor under different temperatures in air, and the Cu doping amount can be readily controlled by the concentration of the precursor solution, whose effect on the lithium storage behaviors of the Cu-doped Nb 2 O 5 is thoroughly investigated. H−Nb 2 O 5 shows obvious redox peaks (Nb 5+ /Nb 4+ and Nb 4+ /Nb 3+ ) with much higher capacity and better cycling stability than those for the widely investigated T−Nb 2 O 5 . When introducing appropriate Cu doping, the optimized H−Cu 0.1 −Nb 2 O 5 electrode shows greatly enhanced conductivity and lower diffusion barrier as revealed by the theoretical calculations and electrochemical characterizations, delivering a high reversible capacity of 203.6 mAh g −1 and a high capacity retention of 140.8 mAh g −1 after 5000 cycles at 1 A g −1 , with a high initial Coulombic efficiency of 91% and a high rate capacity of 144.2 mAh g −1 at 4 A g −1 . As a demonstration for full-cell application, the H−Cu 0.1 −Nb 2 O 5 ||LiFePO 4 cell displays good cycling performance, exhibiting a reversible capacity of 135 mAh g −1 after 200 cycles at 0.2 A g −1 . More importantly, this work offers a new synthesis protocol of the monoclinic Nb 2 O 5 phase with high capacity retention and improved reaction kinetics.

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Highly [001]-oriented N-doped orthorhombic Nb₂O₅ microflowers with intercalation pseudocapacitance for lithium-ion storage

Abstract: Orthorhombic Nb2O5 (T-Nb2O5), as a typical intercalation pseudocapacitor, is in favor of realizing high power and energy density for lithium-ion batteries; furthermore, the 2D layered channels perpendicular to the [001]...

Cited by 10 publications

References 68 publications

Evidence of oxygen vacancy-mediated ultrahigh SERS sensitivity of Niobium pentoxide nanoparticles through defect engineering: theoretical and experimental studies

Evidence of oxygen vacancy-mediated ultrahigh SERS sensitivity of Niobium pentoxide nanoparticles through defect engineering: theoretical and experimental studies

Surface Nitriding Enables Improved Intercalation Pseudocapacitance of T−Nb2O5 for Lithium‐Ion Batteries

Enhancing the Lithium Storage Performance of the Nb₂O₅ Anode via Synergistic Engineering of Phase and Cu Doping

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Highly [001]-oriented N-doped orthorhombic Nb2O5 microflowers with intercalation pseudocapacitance for lithium-ion storage

Abstract: Orthorhombic Nb2O5 (T-Nb2O5), as a typical intercalation pseudocapacitor, is in favor of realizing high power and energy density for lithium-ion batteries; furthermore, the 2D layered channels perpendicular to the [001]...

Cited by 10 publications

References 68 publications

Evidence of oxygen vacancy-mediated ultrahigh SERS sensitivity of Niobium pentoxide nanoparticles through defect engineering: theoretical and experimental studies

Evidence of oxygen vacancy-mediated ultrahigh SERS sensitivity of Niobium pentoxide nanoparticles through defect engineering: theoretical and experimental studies

Surface Nitriding Enables Improved Intercalation Pseudocapacitance of T−Nb2O5 for Lithium‐Ion Batteries

Enhancing the Lithium Storage Performance of the Nb2O5 Anode via Synergistic Engineering of Phase and Cu Doping

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Product

Resources

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Highly [001]-oriented N-doped orthorhombic Nb₂O₅ microflowers with intercalation pseudocapacitance for lithium-ion storage

Enhancing the Lithium Storage Performance of the Nb₂O₅ Anode via Synergistic Engineering of Phase and Cu Doping