2021 roadmap for sodium-ion batteries

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2021 roadmap for sodium-ion batteries ( 2021-roadmap-sodium-ion-batteries )

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J. Phys. Energy 3 (2021) 031503 N Tapia-Ruiz et al Figure 12. Examples of nanostructures in Na2Ti3O7. (a) SEM image of microflowers. Reprinted with permission from [119]. Copyright (2017) American Chemical Society. (b) TEM image of nanotubes. [120] John Wiley & Sons. Concluding remarks Titanium-based oxides represent a very exciting class of anode materials due to their safety, stability, low-cost, non-toxicity, and ease of processing. While progress has been made in terms of understanding the factors limiting the rate performance and cycling stability, much work is still required to realise these concepts in terms of delivering high energy and power densities in NIBs. We anticipate that the greatest advances will arise from further enhancements in electronic conductivity (by combining several of the strategies described here) and further exploration within this family of compounds, including composites. Designing more stable anode/electrolyte interfaces will also be crucial to advance this area of research. This will require a better fundamental understanding of the physicochemical properties at the interface, the behaviour and stability of the fully sodiated phase, and the driving factors behind the poor initial coulombic efficiency. Acknowledgments This research is funded by the Faraday Institution (Grant No. FIRG018). N T R would like to thank Lancaster University for their financial support. R B acknowledges the support of the Lloyd’s Register Foundation and the Royal Academy of Engineering under the Research Fellowships scheme. 27

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