Influence of salt concentration on the electrochemical performance of magnesium hexafluoroisopropoxy aluminate electrolyte

Marojević, Andrijana (avtor), Pavčnik, Tjaša (avtor), Lužanin, Olivera (avtor), Grdadolnik, Jože (avtor), Pirnat, Klemen (avtor), Ponrouch, Alexandre (avtor), Dominko, Robert (avtor), Bitenc, Jan (avtor)

One of the challenges in the development of Mg batteries is the lack of Mg electrolytes with good compatibility with both the Mg metal anode and cathode materials. In recent years, Mg salts based on weakly coordinating anions have emerged as promising Mg electrolytes. In this work, we systematically investigate the effects of salt concentration on the physicochemical properties, salt–solvent interactions, and electrochemical performance of the Mg[Al(hfip)$_4$]$_2$/G2 electrolyte. Infrared (IR) and Raman spectroscopy are used to study the changes in the electrolyte speciation across different concentrations, indicating a decreased amount of free glyme solvent with higher salt concentration. Mg plating/stripping of selected electrolytes is evaluated through three different testing protocols (conventional cycling, macrocycling, and cycling with added open-circuit voltage (OCV) rests) and compatibility with different cathode materials such as Chevrel phase, sulfur, and various organic redox-active compounds. In the electrochemical tests, more concentrated electrolytes demonstrated improved cathode cycling efficiency and more stable Mg plating/stripping, making an argument for Mg electrolytes with higher salt concentration. However, higher salt concentrations can increase the cost of Mg electrolytes. Further Mg electrolyte optimization should focus on adjusting electrolyte composition to specific electrode materials and other cell components, while maintaining a reasonable cost.

• Jezik: Angleški jezik
• Ključne besede: cathode compatibility, different metal plating/stripping procedures, electrolyte speciation, Mg electrolyte, physicochemical properties
• 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: 11 str.
• Številčenje: Vol. 9, iss. 1, art. e202500497
• PID: 20.500.12556/RUL-178298
• UDK: 544.5/.6
• ISSN pri članku: 2566-6223
• DOI: 10.1002/batt.202500497
• COBISS.SI-ID: 250422787
• 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, magnezijeve baterije, shranjevanje energije, elektroliti