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Elucidating gas evolution of Prussian white cathodes for sodium‐ion battery application : the effect of electrolyte and moisture
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Dreyer, Sören L., Maddar, Faduma, Kondrakov, Aleksandr , Janek, Jürgen , Hasa, Ivana and Brezesinski, Torsten (2024) Elucidating gas evolution of Prussian white cathodes for sodium‐ion battery application : the effect of electrolyte and moisture. Batteries & Supercaps . e202300595. doi:10.1002/batt.202300595 ISSN 2566-6223. (In Press)
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Batteries Supercaps - 2024 - Dreyer - Elucidating Gas Evolution of Prussian White Cathodes for Sodium‐ion Battery.pdf - Published Version - Requires a PDF viewer. Available under License Creative Commons Attribution 4.0. Download (1963Kb) | Preview |
Official URL: https://doi.org/10.1002/batt.202300595
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 ~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 H2 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.
Item Type: | Journal Article | ||||||||||||
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Subjects: | Q Science > QD Chemistry T Technology > TK Electrical engineering. Electronics Nuclear engineering |
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Divisions: | Faculty of Science, Engineering and Medicine > Engineering > WMG (Formerly the Warwick Manufacturing Group) | ||||||||||||
Library of Congress Subject Headings (LCSH): | Sodium ion batteries, Storage batteries, Energy storage, Electrochemistry | ||||||||||||
Journal or Publication Title: | Batteries & Supercaps | ||||||||||||
Publisher: | Wiley | ||||||||||||
ISSN: | 2566-6223 | ||||||||||||
Official Date: | 2024 | ||||||||||||
Dates: |
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Article Number: | e202300595 | ||||||||||||
DOI: | 10.1002/batt.202300595 | ||||||||||||
Status: | Peer Reviewed | ||||||||||||
Publication Status: | In Press | ||||||||||||
Access rights to Published version: | Open Access (Creative Commons) | ||||||||||||
Date of first compliant deposit: | 1 February 2024 | ||||||||||||
Date of first compliant Open Access: | 1 February 2024 | ||||||||||||
RIOXX Funder/Project Grant: |
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