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Ion Dynamics in Halogen-Free Phosphonium Bis(salicylato)borate Ionic Liquid Electrolytes for Lithium-Ion Batteries
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Chemical Engineering.ORCID iD: 0000-0003-3652-7798
Institute of Physics, Kazan Federal University .
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Chemical Engineering.ORCID iD: 0000-0002-6810-1882
2017 (English)In: Physical Chemistry, Chemical Physics - PCCP, ISSN 1463-9076, E-ISSN 1463-9084Article in journal (Refereed) Epub ahead of print
Abstract [en]

his work is focused on the investigation of ion dynamics in halogen-free, hydrophobic and hydrolytically stable phosphonium bis(salicylato)borate [P4,4,4,8][BScB] ionic liquid electrolytes for lithium-ion batteries. The structure and purity of the synthesized ionic liquid and lithium bis(salicylato)borate Li[BScB] salt were characterized using 1H, 13C, 31P and 11B NMR spectroscopy. The Li[BScB] salt was mixed with ionic liquid in the concentration range from 2.5 mol % to 20 mol %. The physicochemical properties of the resulting electrolytes were characterized using thermal analysis (TGA and DSC), electrical impedance spectroscopy, pulsed-field gradient (PFG) NMR and ATR-FTIR spectroscopy. The apparent transfer numbers of the individual ions were calculated from the diffusion coefficients of the cation and anion as determined by PFG NMR spectroscopy. NMR and ATR-FTIR spectroscopic techniques revealed dynamic interactions between the lithium cation and bis(salicylato)borate anion in the electrolytes. The ion-ion interactions were found to increase with increase in concentration of Li[BScB] salt, which resulted in ionic clustering at concentrations higher than 15 mol % of Li salt in the ionic liquid.

Place, publisher, year, edition, pages
Royal Society of Chemistry, 2017.
National Category
Physical Chemistry
Research subject
Chemistry of Interfaces
Identifiers
URN: urn:nbn:se:ltu:diva-63622DOI: 10.1039/C7CP02722BPubMedID: 28621370OAI: oai:DiVA.org:ltu-63622DiVA: diva2:1103753
Available from: 2017-05-30 Created: 2017-05-30 Last updated: 2017-06-26

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Publisher's full textPubMedhttp://pubs.rsc.org/en/content/articlelanding/2017/cp/c7cp02722b#!divAbstract

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