Journal article

Authors list: Yusim, Yuriy; Moryson, Yannik; Seipp, Kevin; Sann, Joachim; Henss, Anja

Publication year: 2024

Journal: Batteries & Supercaps

eISSN: 2566-6223

Open access status: Hybrid

DOI Link: https://doi.org/10.1002/batt.202400161

Publisher: Wiley

Abstract: 

The cycle life of poly(ethylene oxide) (PEO) batteries containing lithium bis(trifluoromethanesulfonyl)imide (LiTFSI) is hindered by interfacial (electro)chemical electrolyte decomposition, a process traditionally examined via X-ray photoelectron spectroscopy (XPS). Our research presents a critical examination of X-ray induced photodecomposition, commonly misinterpreted as (electro)chemical electrolyte decomposition, in PEO-LiTFSI systems and those with NCM cathodes. We provide novel insights into this X-ray induced photodecomposition process and show that it is particularly pronounced when LiTFSI is dissolved and not in its pure state. Most importantly, we reveal that cryogenic measurement conditions can almost completely mitigate this photodecomposition. This insight not only deepens the understanding of photodecomposition within XPS analyses but also provides a transformative approach to the accurate characterization of electrolyte materials in lithium batteries.

The cycle life of PEO batteries with LiTFSI is limited by interfacial electrolyte decomposition, often misinterpreted in XPS analyses. This research critically examines X-ray induced photodecomposition in PEO-LiTFSI systems, showing its prominence when LiTFSI is dissolved. Cryogenic conditions are found to mitigate this effect, offering a transformative approach to accurately characterize electrolyte materials in lithium batteries. image

Harvard Citation style: Yusim, Y., Moryson, Y., Seipp, K., Sann, J. and Henss, A. (2024) Challenges in XPS Analysis of PEO-LiTFSI-based Solid Electrolytes: How to Overcome X-ray-Induced Photodecomposition, Batteries & Supercaps. https://doi.org/10.1002/batt.202400161

APA Citation style: Yusim, Y., Moryson, Y., Seipp, K., Sann, J., & Henss, A. (2024). Challenges in XPS Analysis of PEO-LiTFSI-based Solid Electrolytes: How to Overcome X-ray-Induced Photodecomposition. Batteries & Supercaps. https://doi.org/10.1002/batt.202400161