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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 Concluding remarks While the R&D directions of NIBs have largely followed those of LIBs, they are slowly finding their own path, including applications where the emphasis is on complementarity rather than replacement. The somewhat overemphasised similarity of Na+ and Li+ dissolved in solvent(s) has, until today, promoted evolution, leaving NIBs always trailing behind LIBs. However, as an example, it should be possible to use the weaker solvent interactions and generally larger first solvation shells of Na+ as design criteria for novel NIB electrolytes. Likewise, the problematic large solubility in the electrolyte of solvent reduction compounds should be a proper R&D target, similarly to e.g., the polysulphide issue in Li-S batteries. As we are seeing various operando, high-throughput, and robotic screening technologies starting to be applied for battery research, these could all be used to evaluate NIB electrolyte solvents and perhaps also enable the tailoring of the electrolyte to different operating conditions and applications. Acknowledgments The funding received from the European Union’s Horizon 2020 research and innovation programme under Grant Agreement No. 646433 (NAIADES), the Swedish Research Council, the Swedish Energy Agency (#37671-1), and the Swedish Research Council for Environment, Agricultural Sciences and Spatial Planning (FORMAS), are all gratefully acknowledged. The many fruitful discussions within ALISTORE-ERI, and especially with M Rosa Palacín, have been most valuable. P J is also grateful for the continuous support from several of the Chalmers Areas of Advance: Materials Science and Energy. 43

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