E-paper

Publication year: 2022

Journal: arXiv

DOI Link: https://doi.org/10.48550/arXiv.2209.13955

Publisher: Arxiv.org

Abstract: 

Solid state batteries can be built based on thiophosphate electrolytes such as beta-Li3PS4. For the preparation of these electrolytes, various solvent-based routes have been reported. For recycling of end-of-life solid state batteries based on such thiophosphates, we consider the development of dissolution and recrystallization strategies for the recovery of the model compound beta-Li3PS4. We show that recrystallization can only be performed in polar, slightly protic solvents such as N-methylformamide (NMF). The recrystallization is comprehensively studied, showing that it proceeds via an intermediate phase with composition Li3PS4*2NMF, which is structurally characterized. This phase has a high resistivity for the transport of lithium ions and must be removed in order to obtain a recrystallized product with a conductivity similar to the pristine material. Moreover, the recrystallization from solution results in an increase of the amorphous phase fraction next to crystalline beta-Li3PS4, which results in a decrease of the activation energy to 0.2 eV compared to 0.38 eV for the pristine phase.

Harvard Citation style: Wissel, K., Riegger, L., Schneider, C., Waidha, A., Famprikis, T., Ikeda, Y., et al. (2022) Dissolution and Recrystallization Behavior of Li3PS4 in Different Organic Solvents [Preprint]. arXiv, Article 2209.13955. https://doi.org/10.48550/arXiv.2209.13955

APA Citation style: Wissel, K., Riegger, L., Schneider, C., Waidha, A., Famprikis, T., Ikeda, Y., Grabowski, B., Dinnebier, R., Lotsch, B., Janek, J., Ensinger, W., & Clemens, O. (2022). Dissolution and Recrystallization Behavior of Li3PS4 in Different Organic Solvents. arXiv. https://doi.org/10.48550/arXiv.2209.13955