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Tuning of Molecular Water Organization in Water-in-Salt Electrolytes by Addition of Chaotropic Ionic Liquids
KTH Royal Institute of Technology, Sweden.
Uppsala University, Sweden.
RISE Research Institutes of Sweden, Bioekonomi och hälsa, Kemiska processer och läkemedel.ORCID-id: 0000-0003-2410-7366
KTH Royal Institute of Technology, Sweden.
2023 (Engelska)Ingår i: The Journal of Physical Chemistry C, ISSN 1932-7447, E-ISSN 1932-7455, Vol. 127, nr 50, s. 24065-24076Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

Water-in-salt electrolytes (WISEs) have expanded the useful electrochemical stability of water, making the development of functional aqueous lithium-ion batteries more accessible. The implementation of additives in the formulation of WISEs can further improve the electrochemical stability of water and avoid potential lithium-ion salt solubility issues. Here, we have used Gemini-type ionic liquids to suppress water activity by designing the structure of ionic-liquid cations. The different water-organizing effects of ionic-liquid cations have been investigated and correlated to battery performance in LTO/LMO full cells. The champion device, containing the most chaotropic ionic liquid, retained at least 99% of its Coulombic efficiency after 500 charging cycles, associated with a final specific discharge capacity of 85 mA h·g-1. These results indicated that water-rich Li+ solvation shells significantly contribute to the excellent device performance and long-term stability of the LTO/LMO-based full battery cells. This work shows that the fine-tuning of the Li+ solvation shell and water structure by the addition of chaotropic cations represents a promising strategy for generating more stable and effective lithium-ion-containing rechargeable aqueous batteries. 

Ort, förlag, år, upplaga, sidor
American Chemical Society , 2023. Vol. 127, nr 50, s. 24065-24076
Nyckelord [en]
Additives; Electric discharges; Electrolytes; Lithium-ion batteries; Positive ions; Solvation; Tuning; American Chemical Society; Battery performance; Electrochemical stabilities; Li +; Lithium ions; Molecular water; Salt electrolytes; Salt solubility; Solvation shell; Water activity; Ionic liquids
Nationell ämneskategori
Oorganisk kemi
Identifikatorer
URN: urn:nbn:se:ri:diva-68772DOI: 10.1021/acs.jpcc.3c07164Scopus ID: 2-s2.0-85180106308OAI: oai:DiVA.org:ri-68772DiVA, id: diva2:1827698
Forskningsfinansiär
Energimyndigheten, 50119-1Vetenskapsrådet, 2020-06701
Anmärkning

The work was supported by the Swedish Energy Agency contract no. 50119-1, entitled “Be WiSE─Robotic screening of water-in-salt electrolytes (WiSE) for environmental batteries” and the Swedish Research Council contract no. 2020-06701.

Tillgänglig från: 2024-01-15 Skapad: 2024-01-15 Senast uppdaterad: 2024-01-15Bibliografiskt granskad

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