TiNb2O7/carbon nanotube composites as long cycle life anode for sodium-ion batteries

Shang, Biao; Peng, Qimeng; Jiao, Xun; Xi, Guocui; Hu, Xiaoyun

doi:10.1007/s11581-018-2784-z

Cited by 22 publications

(15 citation statements)

References 35 publications

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“…Although the positions of the local minima are the same between the Li and Mg systems, the higher charge in the latter case results in an increase in the electrostatic repulsion at the transition state and thus a higher activation barrier (∼1 eV). Although only a selected number of pathways were investigated for Na + , K + , and Mg 2+ , these results suggest that the diffusion barriers for these ions are intrinsically much larger than for Li + , which explains the requirement for nanosizing in the Na + system. − …”

Section: Resultsmentioning

confidence: 97%

“…There have been a few reports on Na + intercalation into TiNb 2 O 7 , in which the bulk material exhibited very low capacity, although the performance could be improved by nanosizing of the particles. − There have been a dearth of reports of intercalation of other promising “beyond Li ion” cations such as K + and Mg 2+ into the TiNb 2 O 7 structure, and yet this, and related phases, show tunnel structures that should be able to accommodate these ions. After establishing the HEF theoretical framework to determine lithium mobility, it is straightforward to extend the method to other intercalants, as illustrated in this work.…”

Section: Introductionmentioning

confidence: 99%

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Ionic and Electronic Conduction in TiNb₂O₇

et al. 2019

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TiNb2O7 is a Wadsley–Roth phase with a crystallographic shear structure and is a promising candidate for high-rate lithium ion energy storage. The fundamental aspects of the lithium insertion mechanism and conduction in TiNb2O7, however, are not well-characterized. Herein, experimental and computational insights are combined to understand the inherent properties of bulk TiNb2O7. The results show an increase in electronic conductivity of seven orders of magnitude upon lithiation and indicate that electrons exhibit both localized and delocalized character, with a maximum Curie constant and Li NMR paramagnetic shift near a composition of Li0.60TiNb2O7. Square-planar or distorted-five-coordinate lithium sites are calculated to invert between thermodynamic minima or transition states. Lithium diffusion in the single-redox region (i.e., x ≤ 3 in Li x TiNb2O7) is rapid with low activation barriers from NMR and D Li = 10–11 m2 s–1 at the temperature of the observed T 1 minima of 525–650 K for x ≥ 0.75. DFT calculations predict that ionic diffusion, like electronic conduction, is anisotropic with activation barriers for lithium hopping of 100–200 meV down the tunnels but ca. 700–1000 meV across the blocks. Lithium mobility is hindered in the multiredox region (i.e., x > 3 in Li x TiNb2O7), related to a transition from interstitial-mediated to vacancy-mediated diffusion. Overall, lithium insertion leads to effective n-type self-doping of TiNb2O7 and high-rate conduction, while ionic motion is eventually hindered at high lithiation. Transition-state searching with beyond Li chemistries (Na+, K+, Mg2+) in TiNb2O7 reveals high diffusion barriers of 1–3 eV, indicating that this structure is specifically suited to Li+ mobility.

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Section: Resultsmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

Ionic and Electronic Conduction in TiNb₂O₇

et al. 2019

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“…Advanced carbonaceous materials, such as carbon nanofibers (CNFs), carbon nanotubes (CNTs), , ketjen black (KB), graphene, bacterial cellulose carbon (BCC), activated carbon cloth (ACC), carbon nanosheets (CNSs), and heteroatom-doped amorphous carbon from polymer pyrolysis, , are common materials to improve the cycling stability and rate capability of TNO composites. Carbon can not only increase the electronic conductivity of TNO materials but can also reduce TNO and form oxygen vacancies, further increasing the ionic conductivity of TNO materials. , …”

Section: Strategies For Improvement Of Performancementioning

confidence: 99%

“…They proposed that reducing particle size and increasing specific surface area can improve the capacity of TNO as an anode material for SIB. Shang et al 79 showed that, compared with pristine TiNb 2 O 7 , TiNb 2 O 7 /CNTs composites possessed enhanced sodium-ion extraction/insertion. The design of the TNO for SIBs will likely involve nanosized material that provides more active surface area for capacitive sodium-ion storage combined with highly conductive frameworks that enhance the collection and the transfer of electrons.…”

Section: Summary and Future Perspectivesmentioning

confidence: 99%

Recent Advances in Titanium Niobium Oxide Anodes for High-Power Lithium-Ion Batteries

et al. 2020

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High-power energy storage devices are required for many emerging technologies. The rate capability of existing energy storage devices is inadequate to fulfill the requirements of fast charging and discharging while maintaining suitable long-term stability and energy density. This is readily apparent when evaluating the current anode of choice, graphite, which does not have an acceptable high-rate capability using traditional electrolytes. Recent work has shown that titanium niobium oxides (TNO) are promising alternative anode materials with high charge/discharge rates, excellent stability, and reasonable capacity. This article reviews the latest advancements in the development of TNO-based anode materials and architectures for fast energy storage devices, including new insights into understanding their crystal structure and lithiation mechanisms, effective strategies to improve the electrochemical properties of the materials (e.g., defect engineering, composite design, and overlithiation), and rational design of electrode and cell architectures to facilitate fast charge and mass transfer. Critical challenges and new directions in achieving high rate capabilities will also be discussed.

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“…In addition, compounding with carbon materials can not only improve the electronic conductivity of MÀ NbÀ O but also enhance the electrochemical performance of the electrode materials. [6] Shang et al [7] successfully synthesized TiNb 2 O 7 /carbon nanotube composites by ultrasonic dispersion coupled with a simple solvothermal method, which can be maintained at 110 mAh g À 1 specific capacity after more than 1000 cycles at 500 mA g À 1 . The addition of carbon nanotubes not only enhances the rate capability, but also increases the sodium storage capacity.…”

Section: Introductionmentioning

confidence: 99%

Facile Synthesis of SnNb₂O₆@C Composite with Ultrathin Carbon Layer as Anode Materials for High‐Performance Sodium‐Ion Batteries

Liu

Yin

et al. 2022

Chemistry An Asian Journal

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Niobium‐based oxides have attracted a lot of attention as anode materials for sodium‐ion batteries (SIBs) due to their high theoretical specific capacity, excellent rate capability and exceptional safety. However, their poor intrinsic electronic conductivity and sluggish sodium ions diffusion kinetics severely hinder their practical applicability. Here, SnNb2O6@C was successfully prepared by a simple solid‐state reaction technique coupled with carbon coating. HRTEM images show that the SnNb2O6@C particles are covered with uniformly ultrathin amorphous carbon layer of about 1.8 nm, thus improving the electronic conductivity and diffusion coefficient of sodium ions. As anode for SIBs, the as‐obtained SnNb2O6@C material exhibits excellent specific capacity (369 mAh g−1 at a current density of 50 mA g−1) and remarkable rate performance (177 mAh g−1 at 1000 mA g−1), which indicates its good prospect in practical application.

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TiNb2O7/carbon nanotube composites as long cycle life anode for sodium-ion batteries

Cited by 22 publications

References 35 publications

Ionic and Electronic Conduction in TiNb₂O₇

Ionic and Electronic Conduction in TiNb₂O₇

Recent Advances in Titanium Niobium Oxide Anodes for High-Power Lithium-Ion Batteries

Facile Synthesis of SnNb₂O₆@C Composite with Ultrathin Carbon Layer as Anode Materials for High‐Performance Sodium‐Ion Batteries

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TiNb2O7/carbon nanotube composites as long cycle life anode for sodium-ion batteries

Cited by 22 publications

References 35 publications

Ionic and Electronic Conduction in TiNb2O7

Ionic and Electronic Conduction in TiNb2O7

Recent Advances in Titanium Niobium Oxide Anodes for High-Power Lithium-Ion Batteries

Facile Synthesis of SnNb2O6@C Composite with Ultrathin Carbon Layer as Anode Materials for High‐Performance Sodium‐Ion Batteries

Contact Info

Product

Resources

About

Ionic and Electronic Conduction in TiNb₂O₇

Ionic and Electronic Conduction in TiNb₂O₇

Facile Synthesis of SnNb₂O₆@C Composite with Ultrathin Carbon Layer as Anode Materials for High‐Performance Sodium‐Ion Batteries