3D porous V2O5 architectures for high-rate lithium storage

Li, Qifei; Chen, Dong; Tan, Hua; Zhang, Xianghua; Rui, Xianhong; Yu, Yan

doi:10.1016/j.jechem.2019.02.010

Cited by 41 publications

(20 citation statements)

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“…And a pair of redox peaks is attributed to the V 4+ /V 5+ redox couple reaction, being consistent with the previous literature (Zhu et al, 2016). In addition, the appearance diffusion coefficients of Na + (D Na + ) in VOPO 4 •2H 2 O cathodes are also investigated on the basis of the CV technique and the Randles-Sevchik Equation (Li Q. et al, 2020):…”

Section: Resultssupporting

confidence: 87%

VOPO4⋅2H2O Nanosheet Cathode for Enhanced Sodium Storage

et al. 2020

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Na-ion batteries (SIBs) are anticipated to capture a broad development space in the field of large-scale energy storage due to the abundant sodium resources. High-performance cathode materials are very critical. VOPO 4 •2H 2 O with a two-dimensional (2D) layered structure is a very promising candidate for SIBs because of its high working voltage and theoretical specific capacity. Herein, a simple one-step reflux method is designed to fabricate a cathode of VOPO 4 •2H 2 O nanosheets. It exhibits a high average operating potential of ∼3.5 V, remarkable specific capacity (e.g., 135 mAh g −1 at 0.05 C), favorable high current charge-discharge ability (e.g., 58 mAh g −1 even at 20 C) as well as extralong cyclability (e.g., 0.026% capacity fading rate for per cycle at 20 C during 1000 cycles). The kinetic analysis implies that the superior sodium storage performance is mainly benefiting from the advantages of unique nanosheet structure, accelerating the rapid Na-ion diffusion.

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Section: Resultssupporting

confidence: 87%

VOPO4⋅2H2O Nanosheet Cathode for Enhanced Sodium Storage

et al. 2020

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“…As can be seen in Figure 4, vanadium oxides are the most ionic compounds with the greatest variability of charge states, followed by the less ionic chromium oxides, and the most covalent for future high-performance Li ion battery cathodes. [36][37][38] For the lithiation of this material to α-LiV2O5 the PDOS shown in Figure 5 To summarize, we find significant charge density changes around oxygen in the prototypical Li-excess material Li2MnO3 upon oxidation to LiMnO3, but also for its Cr and V counterparts, which would not be expected from the composition of the PDOS of the latter two near the Fermi level. We can relate this to an incomplete projection of O-near density caused by its small augmentation sphere, resulting in an exaggerated transition metal contribution to the valence band maximum.…”

Section: Toc Graphics Abstract: Lithium-excess Materials Projected Dmentioning

confidence: 97%

Oxygen Redox Activity in Cathodes: A Common Phenomenon Calling for Density-Based Descriptors

Koch

Manzhos

2020

J. Phys. Chem. C

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First-principle computations are crucial for the understanding of the oxygen redox mechanism in lithium-excess transition metal oxide materials. An important tool for the assignment of the redox-active species is the projected density of states (PDOS). A topological analysis of the charge density, on the other hand, suggests substantial oxygen redox activity in many transition metal oxide compounds beyond the ones commonly associated with it. This can be linked to the shortcomings of the spherical approximation for ions in crystalline compounds used to compute the PDOS, which fails to describe the charge density topology in transition metal oxides and leads to an erroneous description of the nature of charge transfer compared to a charge density-based approach. The density-based approach, due to the nonspherical nature of its domains, is more apt to properly describe oxygen redox contributions. This raises the question how meaningful the commonly employed descriptors of oxygen redox activity are.

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“…To date, lithium-ion batteries (LIBs) have been widely used in advanced mobile electric vehicles (EVs) and portable electronics because of their high energy density and long lifecycle [1][2][3][4][5][6][7][8][9][10]. However, the capacity of traditional graphite anodes (372 mA h g À1 ) cannot meet the requirement of LIBs for higher energy density [11,12].…”

Section: Introductionmentioning

confidence: 99%