Journal article

Publication year: 2022

Journal: Materials Futures

Volume number: 1

Issue number: 1

eISSN: 2752-5724

Open access status: Gold

DOI Link: https://doi.org/10.1088/2752-5724/ac3897

Publisher: IOP Publishing

Abstract: 

Solid-state batteries (SSBs) are a promising next step in electrochemical energy storage but are plagued by a number of problems. In this study, we demonstrate the recurring issue of mechanical degradation because of volume changes in layered Ni-rich oxide cathode materials in thiophosphate-based SSBs. Specifically, we explore superionic solid electrolytes (SEs) of different crystallinity, namely glassy 1.5Li2S-0.5P2S5-LiI and argyrodite Li6PS5Cl, with emphasis on how they affect the cyclability of slurry-cast cathodes with NCM622 (60% Ni) or NCM851005 (85% Ni). The application of a combination of ex situ and in situ analytical techniques helped to reveal the benefits of using a SE with a low Young's modulus. Through a synergistic interplay of (electro)chemical and (chemo)mechanical effects, the glassy SE employed in this work was able to achieve robust and stable interfaces, enabling intimate contact with the cathode material while at the same time mitigating volume changes. Our results emphasize the importance of considering chemical, electrochemical, and mechanical properties to realize long-term cycling performance in high-loading SSBs.

Video Abstract: The interplay between (electro)chemical and (chemo)mechanical effects in the cycling performance of thiophosphate-based solid-state batteries

Harvard Citation style: Teo, J., Strauss, F., Walther, F., Ma, Y., Payandeh, S., Scherer, T., et al. (2022) The interplay between (electro)chemical and (chemo)mechanical effects in the cycling performance of thiophosphate-based solid-state batteries, Materials Futures, 1(1), Article 015102. https://doi.org/10.1088/2752-5724/ac3897

APA Citation style: Teo, J., Strauss, F., Walther, F., Ma, Y., Payandeh, S., Scherer, T., Bianchini, M., Janek, J., & Brezesinski, T. (2022). The interplay between (electro)chemical and (chemo)mechanical effects in the cycling performance of thiophosphate-based solid-state batteries. Materials Futures. 1(1), Article 015102. https://doi.org/10.1088/2752-5724/ac3897