Article (Scientific journals)
Deep Eutectic Solvents as Nonflammable Electrolytes for Durable Sodium-Ion Batteries
De Sloovere, Dries; Vanpoucke, Danny E. P.; Paulus, Andreas et al.
2022In Advanced Energy and Sustainability Research, n/a (n/a), p. 2100159
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Keywords :
deep eutectic solvents; density functional calculations; electrochemistry; electrolytes; hydrogen bonds
Abstract :
[en] Sodium-ion batteries are alternatives for lithium-ion batteries in applications where cost-effectiveness is of primary concern, such as stationary energy storage. The stability of sodium-ion batteries is limited by the current generation of electrolytes, particularly at higher temperatures. Therefore, the search for an electrolyte which is stable at these temperatures is of utmost importance. Here, such electrolytes are introduced in the form of nonflammable deep eutectic solvents (DESs), consisting of sodium bis(trifluoromethane)sulfonimide (NaTFSI) dissolved in N-methyl acetamide (NMA). Increasing the NaTFSI concentration replaces NMA—NMA hydrogen bonds with strong ionic interactions between NMA, Na+, and TFSI−. These interactions lower NMA's highest occupied molecular orbital (HOMO) energy level compared with that of TFSI−, leading to an increased anodic stability (up to ≈4.65 V versus Na+/Na). (Na3V2(PO4)2F3/carbon nanotube [CNT])/(Na2+x Ti4O9/C) full cells show 97.0 capacity retention after 250 cycles at 0.2 C and 55 °C. This is considerably higher than for (Na3V2(PO4)2F3/CNT)/(Na2+x Ti4O9/C) full cells containing a conventional electrolyte. According to the electrochemical impedance analysis, the improved electrochemical stability is linked to the formation of more robust surface films at the electrode/electrolyte interface. The improved durability and safety highlight that DESs can be viable electrolyte alternatives for sodium-ion batteries.
Disciplines :
Chemistry
Author, co-author :
De Sloovere, Dries
Vanpoucke, Danny E. P.
Paulus, Andreas
Joos, Bjorn
Calvi, Lavinia
Vranken, Thomas
Reekmans, Gunter
Adriaensens, Peter
Eshraghi, Nicolas
Mahmoud, Abdelfattah  ;  Université de Liège - ULiège > Département de chimie (sciences) > LCIS - GreenMAT
Boschini, Frédéric ;  Université de Liège - ULiège > Plateforme APTIS
Safari, Mohammadhosein
Van Bael, Marlies K.
Hardy, An
More authors (4 more) Less
Language :
English
Title :
Deep Eutectic Solvents as Nonflammable Electrolytes for Durable Sodium-Ion Batteries
Publication date :
12 January 2022
Journal title :
Advanced Energy and Sustainability Research
eISSN :
2699-9412
Publisher :
wiley
Volume :
n/a
Issue :
n/a
Pages :
2100159
Peer reviewed :
Peer reviewed
Available on ORBi :
since 12 January 2022

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