Benchmarking Mg electrolytes with different metal plating/stripping protocols

Pavčnik, Tjaša (avtor), Šuster, Janja (avtor), Tchernychova, Elena (avtor), Bitenc, Jan (avtor), Dominko, Robert (avtor)

Over the past two decades, various Mg compounds have been explored in the search for electrolytes with the best electrochemical performance. While notable progress in electrolyte chemistry has been made, the field lacks evaluation protocols for studying electrolytes under closer-to-practical conditions. This work evaluates three generations of Mg electrolytes: organometallic, non-nucleophilic Mg(TFSI)$_2$-MgCl$_2$, and state-of-the-art Mg alkoxyborate/-aluminate electrolytes. Experiments performed under standard galvanostatic cycling show inferior performance of TFSI-based electrolytes compared to all-phenyl complex and Mg[X(hfip)$_4$]$_2$ (X = Al, B) electrolytes. To accelerate side reactions and Mg passivation, additional cycling protocols are introduced, namely, macroreversibility cycling and cycling with OCV rest periods after Mg plating. The latter demonstrates a decline in Coulombic efficiency in all tested electrolytes during OCV rest periods, pointing toward interphase stability as a critical point. The electrochemical analysis is complemented by SEM, EDX, and XPS characterization of Mg metal deposits. XPS results indicate that a more metallic Mg interphase does not necessarily correlate with improved Mg plating/stripping efficiency, emphasizing the key role of interphase composition. This work highlights the need to move beyond conventional laboratory cycling protocols to assess electrolyte stability under realistic conditions and provides a framework for more comprehensive future electrolyte evaluation.

• Jezik: Angleški jezik
• Ključne besede: different cycling procedures, metal/electrolyte interphases, Mg electrolytes, Mg plating/stripping
• Vrsta gradiva: Članek v reviji
• Tipologija: 1.01 - Izvirni znanstveni članek
• Organizacija: FKKT - Fakulteta za kemijo in kemijsko tehnologijo
• Status publikacije: Objavljeno
• Različica publikacije: Objavljena publikacija
• Leto izida: 2026
• Št. strani: 9 str.
• Številčenje: Vol. 9, iss. 1, art. e202500265
• PID: 20.500.12556/RUL-178297
• UDK: 544.5/.6
• ISSN pri članku: 2566-6223
• DOI: 10.1002/batt.202500265
• COBISS.SI-ID: 250334723
• Datum objave v RUL: 22.01.2026

Gradivo je del revije

• Naslov: Batteries & supercaps
• Založnik: Wiley, Chemistry Europe
• ISSN: 2566-6223
• COBISS.SI-ID: 30750979

Licence

• Licenca: CC BY 4.0, Creative Commons Priznanje avtorstva 4.0 Mednarodna
• Povezava: http://creativecommons.org/licenses/by/4.0/deed.sl
• Opis: To je standardna licenca Creative Commons, ki daje uporabnikom največ možnosti za nadaljnjo uporabo dela, pri čemer morajo navesti avtorja.

Sekundarni jezik

• Jezik: Slovenski jezik
• Ključne besede: elektrokemija, elektroliti, magnezij, analize