Dissolution and Recrystallization Behavior of Li3PS4 in Different Organic Solvents

Kerstin Wissel; Luise M. Riegger; Christian Schneider; Aamir I. Waidha; Theodosios Famprikis; Yuji Ikeda; Blazej Grabowski; Robert E. Dinnebier; Bettina V. Lotsch; Juergen Janek; Wolfgang Ensinger; Oliver Clemens

arXiv · 2209.13955

Dissolution and Recrystallization Behavior of Li3PS4 in Different Organic Solvents

Kerstin Wissel·Luise M. Riegger·Christian Schneider·Aamir I. Waidha·Theodosios Famprikis·Yuji Ikeda·Blazej Grabowski·Robert E. Dinnebier·Bettina V. Lotsch·Juergen Janek·Wolfgang Ensinger·Oliver Clemens

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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.

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Kerstin Wissel, Luise M. Riegger, Christian Schneider, Aamir I. Waidha, Theodosios Famprikis, Yuji Ikeda, Blazej Grabowski, Robert E. Dinnebier, Bettina V. Lotsch, Juergen Janek, Wolfgang Ensinger, Oliver Clemens. 2022-09-28. Dissolution and Recrystallization Behavior of Li3PS4 in Different Organic Solvents. https://arxiv.org/abs/2209.13955

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