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Interface effects on self-forming rechargeable Li/I2-based solid state batteries

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Abstract

Solid state batteries are an emerging alternative to traditional liquid electrolyte cells that provide potential for safe and high-energy density power sources. This report describes a self-forming, solid state battery based on the Li/I2 couple using an LiI-rich LiI(3-hydroxypropionitrile)2 electrolyte (LiI–LiI(HPN)2). As the negative and positive active materials are generated in situ, the solid electrolyte–current collector interfaces play a critical role in determining the electrochemical response of the battery. Herein, we report the investigation of solid electrolyte–current collector interfaces with a self-forming LiI–LiI(HPN)2 solid electrolyte and the role of varying interface design in reducing resistance during cycling.

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Acknowledgments

This work was supported by the U.S. Department of Energy Office of Energy Efficiency and Renewable Energy under the Advanced Battery Materials Research program, award DE-EE0007785. Alyson Abraham and Mikaela Dunkin acknowledge support from the Graduate Assistance in Areas of National Need Fellowship. Bingjie Zhang thanks David Bock for helpful suggestions regarding SEM sample preparation. Esther Takeuchi acknowledges the generous support of William and Jane Knapp as the Jane Knapp Chair of Energy and the Environment.

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Correspondence to Amy C. Marschilok.

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The supplementary material for this article can be found at https://doi.org/10.1557/mrc.2019.42

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Abraham, A., Dunkin, M.R., Huang, J. et al. Interface effects on self-forming rechargeable Li/I2-based solid state batteries. MRS Communications 9, 657–662 (2019). https://doi.org/10.1557/mrc.2019.42

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  • DOI: https://doi.org/10.1557/mrc.2019.42

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