Solvent co-intercalation and other chemical surprises in Na-ion batteries
Philipp Adelhelm a
a Humboldt-University of Berlin, Germany
Proceedings of 24th International Conference on Solid State Ionics (SSI24)
London, United Kingdom, 2024 July 14th - 19th
Organizers: John Kilner and Stephen Skinner
Keynote, Philipp Adelhelm, presentation 620
Publication date: 10th April 2024

Layered materials are the foundation of modern Li-ion battery technology and are also used in the Na-ion batteries currently entering the market.[1],[2] A very successful strategy for tuning the properties of layered oxides is to change their composition, e.g. moving from LiCoO2 to NMC or NCA chemistries. This approach, along with understanding the redox activity of oxygen, is also currently a hot topic for Na-ion batteries too. Understanding the effects of doping / chemical substitution of layered oxides is complicated and requires a variety of analytical tools including synchrotron-based methods as well as theory, for example[3],[4]. A second, much less explored strategy for tuning the properties of layered materials is the co-intercalation of solvent molecules. An excellent example is the intercalation of solvated Na-ions into graphite, leading to the family of so-called ternary (or quaternary) graphite intercalation compounds. The use of co-intercalation in electrode reactions opens up a very diverse field of research, but at the same time there are also challenges that can be studied using, for example, operando electrochemical microscopy and operando electrochemical dilatometry. The talk will also present a new model for the formation of these compounds, which is very different from previous assumptions.[5] Recently, the concept of solvent co-intercalation has also been demonstrated for a layered sulfide, suggesting that also cathode active materials may be tuned by co-intercalation.[6],7] Most of the results have been obtained through a Consolidator grant funded by the European Research Council (SEED). During his presentation, the speaker will also take a look back - and into the future - from the perspective of a mid-career professional.


[1] Sodium-ion batteries: Materials, Characterization and Technology ISBN: 978-3-527-34709-4, Wiley Dec 2022, Titirici/Adelhelm/Hu (Editors)

[2] P. Nayak et al. Angew. Chemie. Int. Ed., 2018, DOI: 10.1002/anie.201703772

[3] L. Yang et al. Adv. Functional Materials, 2021, DOI: 10.1002/adfm.202102939

[4] Y. Li et al., Adv. Materials 2024, DOI: 10.1002/adma.202309842

[5] G. Avall et al. Adv. Energy Materials, 2023, DOI: 10.1002/aenm.202301944

[6] G. Ferrero et al. Adv. Energy Materials, 2022, DOI: 10.1002/aenm.202202377

[7] Y. Sun et al, 2024, submitted

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