Highly efficient lithium container based on non-Wadsley-Roth structure Nb18W16O93 nanowires for electrochemical energy storage

Ye, Wuquan; Yu, Haoxiang; Cheng, Xing; Zhu, Haojie; Zheng, Runtian; Liu, Tingting; Long, Nengbing; Shui, Miao; Shu, Jie

doi:10.1016/j.electacta.2018.09.169

Cited by 60 publications

(44 citation statements)

References 78 publications

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“…The similar wide‐scan XPS spectra of Mo 3 Nb 14 O 44 ‐M and Mo 3 Nb 14 O 44 ‐N (Figure ) indicate the existence of Mo, Nb, and O elements. The two XPS peaks centered at 233.05 and 236.15 eV (Figure 2d), respectively, match with the Mo‐3 d 5/2 and Mo‐3 d 3/2 binding energies of Mo 6+ , [ 11,23 ] those at 207.30 and 210.45 eV (Figure 2e), respectively, correspond to Nb‐3 d 5/2 and Nb‐3 d 3/2 of Nb 5+ , [ 24,25 ] and that at 530.11 eV (Figure 2f) can be attributed to O‐1 s of O 2– . [ 26,27 ] These XPS analyses reveal that the valence states of Mo, Nb, and O in both Mo 3 Nb 14 O 44 materials are, respectively, +6, +5, and –2, confirming the successful fabrications of pure Mo 3 Nb 14 O 44 through both the solid‐state reaction and electrospinning methods.…”

Section: Resultssupporting

confidence: 56%

Mo₃Nb₁₄O₄₄: A New Li⁺ Container for High‐Performance Electrochemical Energy Storage

Liang

Zhu

et al. 2020

Energy & Environ Materials

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To meet the application requirements of electric vehicles, tremendous efforts have so far been devoted to the development of high-performance lithium-ion batteries (LIBs) with elevated safety, large specific capacities, high energy-conversion efficiencies, fast-charging performance, and long-term cycle life. [1-6] The electrochemical properties of LIBs mainly rely on the nature of electrode materials. However, graphite, which is the most popular and commercial anode material, suffers from its unsatisfactory safety due to the probable lithium-dendrite formation when fast charged at its overly low operating potential (~0.1 V vs Li/Li +). [7] Li 4 Ti 5 O 12 , another commercial anode material, owns a safe operating potential of~1.6 V, but suffers from its overly small specific capacity (only 175 mAh g-1 theoretically). [8] Clearly, it is still very challenging to exploit practical anode materials with comprehensively good electrochemical properties (at least including both good safety and large specific capacities). Recently, intercalating Nb-based oxides, [1,9-18] such as T-Nb 2 O 5 , TiNb 2 O 7 , AlNb 11 O 29 W 5 Nb 16 O 55, and Cu 2 Nb 34 O 87 , have emerged as next-generation anode materials having both good safety and large specific capacities. The Nb 5+ /Nb 4+ and Nb 4+ /Nb 3+ redox couples in the Nb-based oxides are active in the potential range of 0.8-2.0 V, resulting in their good safety similar to Li 4 Ti 5 O 12. The two-electron transfer between Nb 5+ and Nb 3+ enables the large specific capacities (theoretically within 374-403 mAh g-1 and practically > 250 mAh g-1). Additionally, since the Nb element is heavy, the micron-sized Nb-based oxides always exhibit high tap density of >2.5 g cm-3 , much higher than that of graphite (~1.0 g cm-3) and Li 4 Ti 5 O 12 (~1.7 g cm-3) with similar particle sizes. [19] These desirable merits render the Nb-based oxides very promising for the practical application in the high-performance LIBs for electric vehicles. However, the exploited Nb-based oxide anode compounds are still very limited. Here, we exploit Mo 3 Nb 14 O 44 as a new niobium-based oxide anode compound for high-performance Li + storage. Mo 3 Nb 14 O 44 has two interesting features. First, besides the Nb-based redox couples, the Mo 6+ / Mo 5+ and Mo 5+ /Mo 4+ couples can also be active in Mo 3 Nb 14 O 44 , [11] benefiting its theoretical capacity (398 mAh g-1), which surpasses those of most Nb-based oxide anode compounds exploited. Secondly, Mo 3 Nb 14 O 44 owns an open and stable shear ReO 3 crystal structure, [20] benefiting its rate performance and cycling stability. In this work, two Mo 3 Nb 14 O 44 materials with distinct morphologies, that is, Mo 3 Nb 14 O 44 micron-sized particles (Mo 3 Nb 14 O 44-M) and Mo 3 Nb 14 O 44 nanowires (Mo 3 Nb 14 O 44-N), respectively, fabricated from the solid-state reaction and electrospinning processes (Figure 1), are demonstrated as prominent anode materials with not only safe operating potentials and large reversible capacities but also high initial coulombic efficien...

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Section: Resultssupporting

confidence: 56%

Mo₃Nb₁₄O₄₄: A New Li⁺ Container for High‐Performance Electrochemical Energy Storage

Liang

Zhu

et al. 2020

Energy & Environ Materials

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“…As can be seen in Fig. 2 a, all of the diffraction peaks can be well indexed to the orthorhombic tetragonal tungsten bronze (JCPDS No 75-0561) [ 32 , 36 ]. The sharp and well-recognized diffraction peaks demonstrates the high crystallinity arising from the high temperature annealing.…”

Section: Resultsmentioning

confidence: 99%

Niobium Tungsten Oxide in a Green Water-in-Salt Electrolyte Enables Ultra-Stable Aqueous Lithium-Ion Capacitors

et al. 2020

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HIGHLIGHTS • A green water-in-salt electrolyte was developed using lithium acetate as solute with a wide electrochemical stability window of 2.8 V. • Molecular dynamics simulation confirmed the nature of water-in-salt electrolyte, where hydrogen bonds of water-water were disrupted and ionic interactions became stronger than dilute solution. • Nb 18 W 16 O 93-based lithium-ion capacitors delivered unexceptionable stability over 50,000 cycles.

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“…As already mentioned above, the electrochemical investigations on TTB-type NbW oxides gained momentum after the study on Nb18W16O93 had been published by Griffith et al in 2018 [1]. Several follow-up investigations confirmed the outstanding electrochemical performance of samples with this composition [8][9][10][11][12][13]. An orthorhombic structure Nb18W16O93 was proposed by Stephenson in 1968 to explain split reflections observed in higher order Laue zones of a twinned crystal with the composition Nb12W11O63 (6Nb2O5:11WO3) [14].…”

Section: Introductionmentioning

confidence: 94%

On the Arrangement of Pentagonal Columns in Tetragonal Tungsten Bronze-Type Nb18W16O93

Krumeich¹

2021

Preprint

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The evaluation of HAADF-STEM images of a sample with the composition Nb18W16O93 provided new insights in its real structure. The basic structure comprises an intact octahedral framework of the tetragonal tungsten bronze (TTB) type. The partial occupation of the pentagonal tunnels (PT) by metal-oxygen strings determines the oxygen to metal ratio (O/SM with M = Nb,W). For a large area, the O/SM was determined to be 2.755 which is smaller than the value of Nb18W16O93 which is O/SM = 2. 735. To a large extent, the threefold TTB superstructure structure of Nb8W9O47 with a high oxygen content is present (O/SM = 2.765). In addition, a new fourfold TTB superstructure was found in small domains: Nb12W11O63 with an O/SM = 2.739 obviously accommodates a part of the sample’s metal excess compared to the stable phase Nb8W9O47.

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Highly efficient lithium container based on non-Wadsley-Roth structure Nb18W16O93 nanowires for electrochemical energy storage

Cited by 60 publications

References 78 publications

Mo₃Nb₁₄O₄₄: A New Li⁺ Container for High‐Performance Electrochemical Energy Storage

Mo₃Nb₁₄O₄₄: A New Li⁺ Container for High‐Performance Electrochemical Energy Storage

Niobium Tungsten Oxide in a Green Water-in-Salt Electrolyte Enables Ultra-Stable Aqueous Lithium-Ion Capacitors

On the Arrangement of Pentagonal Columns in Tetragonal Tungsten Bronze-Type Nb18W16O93

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Highly efficient lithium container based on non-Wadsley-Roth structure Nb18W16O93 nanowires for electrochemical energy storage

Cited by 60 publications

References 78 publications

Mo3Nb14O44: A New Li+ Container for High‐Performance Electrochemical Energy Storage

Mo3Nb14O44: A New Li+ Container for High‐Performance Electrochemical Energy Storage

Niobium Tungsten Oxide in a Green Water-in-Salt Electrolyte Enables Ultra-Stable Aqueous Lithium-Ion Capacitors

On the Arrangement of Pentagonal Columns in Tetragonal Tungsten Bronze-Type Nb18W16O93

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Mo₃Nb₁₄O₄₄: A New Li⁺ Container for High‐Performance Electrochemical Energy Storage

Mo₃Nb₁₄O₄₄: A New Li⁺ Container for High‐Performance Electrochemical Energy Storage