Journal article

Authors list: Dreyer, Sören L; Maddar, Faduma M; Kondrakov, Aleksandr; Janek, Jürgen; Hasa, Ivana; Brezesinski, Torsten

Publication year: 2024

Journal: Batteries & Supercaps

Volume number: 7

Issue number: 4

eISSN: 2566-6223

Open access status: Hybrid

DOI Link: https://doi.org/10.1002/batt.202300595

Publisher: Wiley

Abstract: 
As global energy storage demand increases, sodium-ion batteries are often considered as an alternative to lithium-ion batteries. Hexacyanoferrate cathodes, commonly referred to as Prussian blue analogues (PBAs), are of particular interest due their low-cost synthesis and promising electrochemical response. However, because they consist of similar to 50 wt% cyanide anions, a possible release of highly toxic cyanide gases poses a significant safety risk. Previously, we observed the evolution of (CN)(2) during cycling via differential electrochemical mass spectrometry (DEMS), but were unable to determine a root cause or mechanism. In this work, we present a systematical investigation of the gas evolution of Prussian white (PW) with different water content via DEMS. While H-2 is the main gas detected, especially in hydrated PW and during overcharge (4.6 V vs. Na+/Na), the evolution of CO2 and (CN)(2) depends on the electrolyte conductive salt. The use of oxidative NaClO4 instead of NaPF6 is the leading cause for the formation of (CN)(2). Mass spectrometric evidence of trace amounts of HCN is also found, but to a much lower extent than (CN)(2), which is the dominant safety risk when using NaClO4-containing electrolyte, which despite being a good model salt, is not a viable option for commercial applications.

Harvard Citation style: Dreyer, S., Maddar, F., Kondrakov, A., Janek, J., Hasa, I. and Brezesinski, T. (2024) Elucidating Gas Evolution of Prussian White Cathodes for Sodium-ion Battery Application: The Effect of Electrolyte and Moisture, Batteries & Supercaps, 7(4), Article e202300595. https://doi.org/10.1002/batt.202300595

APA Citation style: Dreyer, S., Maddar, F., Kondrakov, A., Janek, J., Hasa, I., & Brezesinski, T. (2024). Elucidating Gas Evolution of Prussian White Cathodes for Sodium-ion Battery Application: The Effect of Electrolyte and Moisture. Batteries & Supercaps. 7(4), Article e202300595. https://doi.org/10.1002/batt.202300595