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Investigating the influence of synthesis route on the crystallinity and rate capability of niobium pentoxide for energy storage
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Wheeler-Jones, Evangeline, Loveridge, Melanie and Walton, Richard I. (2021) Investigating the influence of synthesis route on the crystallinity and rate capability of niobium pentoxide for energy storage. Electrochimica Acta, 392 . 138964. doi:10.1016/j.electacta.2021.138964 ISSN 0013-4686.
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WRAP-investigating-influence-synthesis-route-crystallinity-rate-capability-niobium-pentoxide-energy-storage-Wheeler-Jones-2021.pdf - Accepted Version - Requires a PDF viewer. Available under License Creative Commons Attribution Non-commercial No Derivatives 4.0. Download (1879Kb) | Preview |
Official URL: http://dx.doi.org/10.1016/j.electacta.2021.138964
Abstract
Orthorhombic niobium pentoxide (T-Nb2O5) is known to be an effective anode material for Li-ion batteries (LIBs) with very high rate capability, but the other Nb2O5 polymorphs and non-crystalline phases have lacked thorough exploration. A simple hydrothermal mechanism is used to produce an anisotropically crystalline ‘as-synthesised material’, which has not previously been characterised electrochemically. The as-synthesised material is heat-treated to produce T-Nb2O5 at 600°C and monoclinic (H-) Nb2O5 at 1000°C. We present electrochemical properties for all of these materials. Collectively we report rate sweeps and demonstrate high current stability (20 C-rate capability) and a long life span, up to 200 cycles. We propose the H-phase as a high rate anode when prepared via an anisotropically crystalline precursor, as it is able to demonstrate 60 % capacity retention after 200 cycles at a notably high current flux of 20 C. Such high rates results are rare for this material without integration with carbon materials. For the anisotropically crystalline Nb2O5 material, we achieve cycling rates up to 100 C with 80% capacity recovery upon current reduction, representing an important discovery in the development of very high rate anode materials.
| Item Type: | Journal Article | ||||||||||||
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| Subjects: | Q Science > QD Chemistry | ||||||||||||
| Divisions: | Faculty of Science, Engineering and Medicine > Science > Chemistry Faculty of Science, Engineering and Medicine > Engineering > WMG (Formerly the Warwick Manufacturing Group) |
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| Library of Congress Subject Headings (LCSH): | Anisotropy , Niobium oxide -- Synthesis, Crystallization | ||||||||||||
| Journal or Publication Title: | Electrochimica Acta | ||||||||||||
| Publisher: | Elsevier | ||||||||||||
| ISSN: | 0013-4686 | ||||||||||||
| Official Date: | 1 October 2021 | ||||||||||||
| Dates: |
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| Volume: | 392 | ||||||||||||
| Article Number: | 138964 | ||||||||||||
| DOI: | 10.1016/j.electacta.2021.138964 | ||||||||||||
| Status: | Peer Reviewed | ||||||||||||
| Publication Status: | Published | ||||||||||||
| Access rights to Published version: | Restricted or Subscription Access | ||||||||||||
| Date of first compliant deposit: | 3 August 2021 | ||||||||||||
| Date of first compliant Open Access: | 30 July 2022 | ||||||||||||
| RIOXX Funder/Project Grant: |
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