Fabrication strategies for high-rate TiO₂ nanotube anodes for Li ion energy storage
Date
2020
Authors
Jiang, Y.
Hall, C.
Burr, P.A.
Song, N.
Lau, D.
Yuwono, J.
Wang, D.-W.
Ouyang, Z.
Lennon, A.
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Journal article
Citation
Journal of Power Sources, 2020; 463
Statement of Responsibility
Yu Jiang, Charles Hall, Patrick A. Burr, Ning Song, Derwin Lau, Jodie Yuwono, Da-Wei Wang, Zi Ouyang, Alison Lennon
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Abstract
Fabrication strategies for TiO₂ nanotube (NT) electrodes were optimised with an aim to improve the understanding of the material attributes required for enhanced areal capacity without compromising rate capability and cycling stability in these alternative high-rate anodes for Li ion batteries. The investigation considered the effects of: i) the geometry of the current collecting scaffolds (planar or foam); ii) crystallographic structure of TiO₂ (amorphous or crystalline); and iii) NT geometry arising from use of different anodisation conditions. By optimising the three strategies concurrently, we were able to demonstrate amorphous TiO₂ NT electrodes on a Ti foam current collector with not only a high areal capacity of 507 μAh cm⁻² (recorded at 50 μA cm⁻²) but also improved rate capability (retained a capacity of 347 μAh cm⁻² at 5 mA cm⁻²) and long-term cycling stability (capacity retention of 83% after 2000 cycles). This achievement of high areal capacity, rate capacity and cycling stability, which is superior to that reported previously, is attributed to the combined higher surface area of the foams, faster Li ion diffusion in the amorphous TiO₂ compared to crystalline TiO₂ and improved electronic conductivity and structural stability of the NTs enabled by limiting NT lengths.
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© 2020 Elsevier B.V. All rights reserved.