High-Rate Intercalation without Nanostructuring in Metastable Nb<sub>2</sub>O<sub>5</sub> Bronze Phases

Griffith, Kent J.; Forse, Alexander C.; Griffin, John M.; Grey, Clare P.

doi:10.1021/jacs.6b04345

Cited by 277 publications

(341 citation statements)

References 81 publications

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“…Depending on the thermal treatment conditions, Nb 2 O 5 possesses several polymorphs, including pseudohexagonal Nb 2 O 5 (TT‐Nb 2 O 5 ), orthorhombic Nb 2 O 5 (T‐Nb 2 O 5 ), tetragonal Nb 2 O 5 (M‐Nb 2 O 5 ), and monoclinic Nb 2 O 5 (H‐Nb 2 O 5 ) . The different crystal structures of Nb 2 O 5 greatly affect their respective electrochemical performances, which has been discussed in some previous reports . Among them, T‐Nb 2 O 5 shows substantially better electrochemical performances.…”

Section: Nb2o5 Electrodesmentioning

confidence: 99%

“…Theoretically, Li‐ion insert/extract into/from T‐Nb 2 O 5 can be expressed as: Nb 2 O 5 + x Li + + x e − ⇔ Li x Nb 2 O 5 , x is the mole fraction of the inserted Li‐ions. The maximum value of x is 2 with a maximum theoretical capacity of 200 mA h g −1 …”

Section: Nb2o5 Electrodesmentioning

confidence: 99%

“…The experimental Raman spectroscopic evolution verified the unique Li‐ion intercalation mechanism by a comprehensive vibrational analysis, which was in agreement with the results of theoretical calculation. In addition, lithium dynamics in T‐Nb 2 O 5 were investigated by Grey et al using nuclear magnetic resonance (NMR) techniques . Their experimental results clarified the fast Li‐ion intercalation kinetics in T‐Nb 2 O 5 .…”

Section: Nb2o5 Electrodesmentioning

confidence: 99%

“…As we can see, T‐Nb 2 O 5 with porous structure has the superiority to realize the outstanding electrochemical performances. Besides the studies of the promising orthorhombic Nb 2 O 5 phase, the electrochemical performances for other phases (pseudohexagonal, tetragonal and monoclinic) have been investigated in previous reports . They also exhibited potential energy storage application in LIBs.…”

Section: Nb2o5 Electrodesmentioning

confidence: 99%

See 3 more Smart Citations

Niobium‐Based Oxides Toward Advanced Electrochemical Energy Storage: Recent Advances and Challenges

Deng

Zhu

et al. 2019

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Niobium‐based oxides including Nb2O5, TiNbxO2+2.5x compounds, M–Nb–O (M = Cr, Ga, Fe, Zr, Mg, etc.) family, etc., as the unique structural merit (e.g., quasi‐2D network for Li‐ion incorporation, open and stable Wadsley– Roth shear crystal structure), are of great interest for applications in energy storage systems such as Li/Na‐ion batteries and hybrid supercapacitors. Most of these Nb‐based oxides show high operating voltage (>1.0 V vs Li+/Li) that can suppress the formation of solid electrolyte interface film and lithium dendrites, ensuring the safety of working batteries. Outstanding rate capability is impressive, which can be derived from their fast intercalation pseudocapacitive kinetics. However, the intrinsic poor electrical conductivity hinders their energy storage applications. Various strategies including structure optimization, surface engineering, and carbon modification are effectively used to overcome the issues. This review provides a comprehensive summary on the latest progress of Nb‐based oxides for advanced electrochemical energy storage applications. Major impactful work is outlined, promising research directions, and various performance‐optimizing strategies, as well as the energy storage mechanisms investigated by combining theoretical calculations and various electrochemical characterization techniques. In addition, challenges and perspectives for future research and commercial applications are also presented.

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Section: Nb2o5 Electrodesmentioning

confidence: 99%

Section: Nb2o5 Electrodesmentioning

confidence: 99%

Section: Nb2o5 Electrodesmentioning

confidence: 99%

Section: Nb2o5 Electrodesmentioning

confidence: 99%

See 2 more Smart Citations

Niobium‐Based Oxides Toward Advanced Electrochemical Energy Storage: Recent Advances and Challenges

Deng

Zhu

et al. 2019

Small

152

115

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“…Band gap insulators based on early transition metals, such as TiO 2 and WO 3 , are of great interest because of their practical applications in photocatalysts, Li-ion battery anodes, pigments, and dielectric devices. 1)3) Interestingly, oxygen removal from these insulators, which involves complex structure modification, drastically changes the physical properties.…”

Section: Introductionmentioning

confidence: 99%

Low-temperature solid-state reduction approach to highly reduced titanium oxide nanocrystals

Tsujimoto

2018

J. Ceram. Soc. Japan

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Considerable attention has been paid to reduced transition metal nanomaterials because they exhibit attractive properties for practical applications in fuel cells, memory or thermoelectric devices, and photocatalysts. In particular, a series of oxygen-nonstoichiometric titanium oxides has advantages such as abundance of the elements, non-toxicity, corrosion resistance, and high electrical conductivity. However, the control of nanostructures is not straightforward because a high-temperature reductive condition is required for the synthesis of highly reduced metal oxides. Recently, it has been demonstrated that the novel low-temperature reduction technique can afford highly reduced titania nanoparticles with different particle sizes ranging from 20 to 300 nm diameter. This review article is focused on the synthesis of corundum-type Ti 2 O 3 nanoparticles, the reaction mechanism, and the correlation between structure and physical properties.

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Dental Resin Monomer Enables Unique NbO₂/Carbon Lithium‐Ion Battery Negative Electrode with Exceptional Performance

Gao

Zhang

et al. 2019

Adv Funct Materials

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Niobium dioxide (NbO 2 ) features a high theoretical capacity and an outstanding electron conductivity, which makes it a promising alternative to the commercial graphite negative electrode. However, studies on NbO 2 based lithium-ion battery negative electrodes have been rarely reported. In the present work, NbO 2 nanoparticles homogeneously embedded in a carbon matrix are synthesized through calcination using a dental resin monomer (bisphenol A glycidyl dimethacrylate, Bis-GMA) as the solvent and a carbon source and niobium ethoxide (NbETO) as the precursor. It is revealed that a low Bis-GMA/NbETO mass ratio (from 1:1 to 1:2) enables the conversion of Nb (V) to Nb (IV) due to increased porosity induced by an alcoholysis reaction between the NbETO and Bis-GMA. The as-prepared NbO 2 /carbon nanohybrid delivers a reversible capacity of 225 mAh g −1 after 500 cycles at a 1 C rate with a Coulombic efficiency of more than 99.4% in the cycles. Various experimental and theoretical approaches including solid state nuclear magnetic resonance, ex situ X-ray diffraction, differential electrochemical mass spectrometry, and density functional theory are utilized to understand the fundamental lithiation/delithiation mechanisms of the NbO 2 /carbon nanohybrid. The results suggest that the NbO 2 /carbon nanohybrid bearing high capacity, long cycle life, and low gas evolution is promising for lithium storage applications.intercalation behavior and to reveal the fundamental mechanisms of NbO 2 based lithium-ion battery negative electrodes. A size reduction to the nanoscale range is identified of being crucial to demonstrate electrochemical activity toward lithium intercalation, where micrometer and sub-micrometer-sized particles only possess very limited actual capacities. [2e] The deposition of nanosized Nb 2 O 5 particles onto a carbon foam followed by high-temperature annealing in a reducing atmosphere proved to be an effective way to synthesize NbO 2 nanoparticles bearing a reasonable electrochemical performance in lithium microbatteries. [4b] Nevertheless, the limited amount of NbO 2 nanoparticles within the carbon foam resulted in a low total energy output, which made it only suitable for microbatteries. Hydrothermal reaction was applied to synthesize NbO 2 / carbon core shell nanocomposites, which showed a good electrochemical performance in super capacitors. [4a] However, an application as lithium-ion battery negative electrode was not addressed. Besides, the suggested synthetic method will be difficult to scale up, which renders this approach from the literature to be nonfeasible for practical applications.In our previous work, a new concept was developed to synthesize intercalation negative electrode in a facile scalable way. TiO 2 /C and Li 4 Ti 5 O 12 /C nanohybrid particles with super-small-sized TiO 2 or Li 4 Ti 5 O 12 nanoparticles were in situ formed and homogeneously embedded in a carbon matrix. [5] The dental resin monomers of bisphenol A glycidyl dimethacrylate (Bis-GMA) and triethylene glycol dimethacrylate ...

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High-Rate Intercalation without Nanostructuring in Metastable Nb₂O₅ Bronze Phases

Cited by 277 publications

References 81 publications

Niobium‐Based Oxides Toward Advanced Electrochemical Energy Storage: Recent Advances and Challenges

Niobium‐Based Oxides Toward Advanced Electrochemical Energy Storage: Recent Advances and Challenges

Low-temperature solid-state reduction approach to highly reduced titanium oxide nanocrystals

Dental Resin Monomer Enables Unique NbO₂/Carbon Lithium‐Ion Battery Negative Electrode with Exceptional Performance

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High-Rate Intercalation without Nanostructuring in Metastable Nb2O5 Bronze Phases

Cited by 277 publications

References 81 publications

Niobium‐Based Oxides Toward Advanced Electrochemical Energy Storage: Recent Advances and Challenges

Niobium‐Based Oxides Toward Advanced Electrochemical Energy Storage: Recent Advances and Challenges

Low-temperature solid-state reduction approach to highly reduced titanium oxide nanocrystals

Dental Resin Monomer Enables Unique NbO2/Carbon Lithium‐Ion Battery Negative Electrode with Exceptional Performance

Contact Info

Product

Resources

About

High-Rate Intercalation without Nanostructuring in Metastable Nb₂O₅ Bronze Phases

Dental Resin Monomer Enables Unique NbO₂/Carbon Lithium‐Ion Battery Negative Electrode with Exceptional Performance