Abstract:The search for new materials that could be used as electrode material for Na-ion batteries is one of the most challenging issues of today. Many transition metal oxide families as well as transition metal polyanionic frameworks have been proposed over the last five years. In this work, we report the sodium extraction from Na2V3O7, which is a tunnel type structure built of [V3O7]2−∞ nanotubes held by sodium ions. We report a reversible charge capacity of 80 mAh/g at 2.8 V vs. Na+/Na due to the V5+/V4+ redox acti… Show more
“…Very recently, electrochemical measurements for Na 2 V 3 O 7 cathode materials have been reported by Adamczyk et al . and in our previous work, confirming their rechargeable charge-discharge properties 9,10 . In this report, we present high rate and stable cycle performances, and the origin of these electrochemical performances is discussed thorough experimental and computational structure analyses.Figure 1A total of 9096 inorganic solid-state samples that contained both Na and O were extracted from the inorganic crystal structure dataset (ICSD) 23 , and migration energies were evaluated for 4314 samples (gray symbols) using bond valence-based force field (BVFF) 24 potential calculations and the percolation algorithm, as shown in panel (a) 7 .…”
Section: Introductionsupporting
confidence: 88%
“…Note that the present results show much better rate and cycle performances than the recent work by Adamczyk et al . 9 . We inferred that the difference stems from (1) the higher charge cutoff voltage (4.5 V) than the present condition (3.5 V), which causes slow Na + diffusion, as mentioned later, and (2) inclusion of the impurity phase, Na 9 V 14 O 35 (7%), in the recent report 9 .…”
Sodium ion batteries meet the demand for large-scale energy storage, such as in electric vehicles, due to the material abundance of sodium. In this report, nanotube-type Na2V3O7 is proposed as a cathode material because of its fast sodium diffusivity, an important requirement for sodium ion batteries, through the investigation of ~4300 candidates via a high-throughput computation. High-rate performance was confirmed, showing ~65% capacity retention at a current density of 10C at room temperature, despite the large particle size of >5 μm. A good cycle performance of ca. 94% in capacity retention after 50 cycles was obtained owing to a small volumetric change of <0.4%.
“…Very recently, electrochemical measurements for Na 2 V 3 O 7 cathode materials have been reported by Adamczyk et al . and in our previous work, confirming their rechargeable charge-discharge properties 9,10 . In this report, we present high rate and stable cycle performances, and the origin of these electrochemical performances is discussed thorough experimental and computational structure analyses.Figure 1A total of 9096 inorganic solid-state samples that contained both Na and O were extracted from the inorganic crystal structure dataset (ICSD) 23 , and migration energies were evaluated for 4314 samples (gray symbols) using bond valence-based force field (BVFF) 24 potential calculations and the percolation algorithm, as shown in panel (a) 7 .…”
Section: Introductionsupporting
confidence: 88%
“…Note that the present results show much better rate and cycle performances than the recent work by Adamczyk et al . 9 . We inferred that the difference stems from (1) the higher charge cutoff voltage (4.5 V) than the present condition (3.5 V), which causes slow Na + diffusion, as mentioned later, and (2) inclusion of the impurity phase, Na 9 V 14 O 35 (7%), in the recent report 9 .…”
Sodium ion batteries meet the demand for large-scale energy storage, such as in electric vehicles, due to the material abundance of sodium. In this report, nanotube-type Na2V3O7 is proposed as a cathode material because of its fast sodium diffusivity, an important requirement for sodium ion batteries, through the investigation of ~4300 candidates via a high-throughput computation. High-rate performance was confirmed, showing ~65% capacity retention at a current density of 10C at room temperature, despite the large particle size of >5 μm. A good cycle performance of ca. 94% in capacity retention after 50 cycles was obtained owing to a small volumetric change of <0.4%.
“…The similarities in the materials and mechanisms occurring in the field of batteries and of electrochromic systems, also described as optical-batteries, have stimulated our interest for opening the characterization of the EC properties to sodium-based electrolytes. As a matter of fact, V2O5 has received significant attention for the challenging issues of Na-ion batteries [47].…”
Section: Iii22 Electrochromic Properties In Sodium-based Electrolytementioning
Transition metal oxides (TMOs) have attracted considerable attention due to their variety of chromogenic properties. Among them, vanadium pentoxide (V2O5) has gained significant interest in respect of multichromism associated with orange, green and blue colors. Herein, we report a simple and easy method for the fabrication of Mo doped V2O5 thick films, leading to improved cyclability. Molybdenum doped vanadium pentoxide powders were synthesized from one single polyol route through the precipitation of an intermediate precursor: molybdenum doped vanadium ethyleneglycolate (Mo doped VEG). The as-synthesized Mo-doped V2O5 exhibits improved electrochromic performance in terms of capacity, cycling stability, and color contrast compared to single-component V2O5 in lithium as well as sodium based electrolyte. The improvement in EC performances lies in films of higher porosity as well as higher diffusion coefficients. To conclude, an electrochromic device combining Mo-V2O5 to WO3.2H2O, via a PMMA-lithium based electrolyte membrane exhibit simultaneously reversible color change from yellow to green for Mo-V2O5 and from blue to yellow white for WO3.2H2O with a cycling stability up to 10 000 cycles.
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