Display options
Cite
Rohde M, Eiden P, Leppert V, et al. Li[B(OCH2CF3)4]: synthesis, characterization and electrochemical application as a conducting salt for LiSB batteries. Chemphyschem. 2014;16(3):666-75doi: 10.1002/cphc.201402680.
Rohde, M., Eiden, P., Leppert, V., Schmidt, M., Garsuch, A., Semrau, G., & Krossing, I. (2015). Li[B(OCH2CF3)4]: synthesis, characterization and electrochemical application as a conducting salt for LiSB batteries. Chemphyschem : a European journal of chemical physics and physical chemistry, 16(3), 666-75. https://doi.org/10.1002/cphc.201402680
Rohde, Michael, et al. "Li[B(OCH2CF3)4]: synthesis, characterization and electrochemical application as a conducting salt for LiSB batteries." Chemphyschem : a European journal of chemical physics and physical chemistry vol. 16,3 (2015): 666-75. doi: https://doi.org/10.1002/cphc.201402680
Rohde M, Eiden P, Leppert V, Schmidt M, Garsuch A, Semrau G, Krossing I. Li[B(OCH2CF3)4]: synthesis, characterization and electrochemical application as a conducting salt for LiSB batteries. Chemphyschem. 2015 Feb 23;16(3):666-75. doi: 10.1002/cphc.201402680. Epub 2014 Dec 17. PMID: 25521464.
Copy Download .nbib Format: NLM
Share it on

Chemphyschem. 2015 Feb 23;16(3):666-75. doi: 10.1002/cphc.201402680. Epub 2014 Dec 17.

Li[B(OCH2CF3)4]: synthesis, characterization and electrochemical application as a conducting salt for LiSB batteries.

Chemphyschem : a European journal of chemical physics and physical chemistry

Michael Rohde, Philipp Eiden, Verena Leppert, Michael Schmidt, Arnd Garsuch, Guenter Semrau, Ingo Krossing

Affiliations

  1. Institut für Anorganische und Analytische Chemie and Freiburger Materialforschungszentrum (FMF), Universität Freiburg, Albertstr. 21, 79104 Freiburg (Germany).

PMID: 25521464 DOI: 10.1002/cphc.201402680

Abstract

A new Li salt with views to success in electrolytes is synthesized in excellent yields from lithium borohydride with excess 2,2,2-trifluorethanol (HOTfe) in toluene and at least two equivalents of 1,2-dimethoxyethane (DME). The salt Li[B(OTfe)4 ] is obtained in multigram scale without impurities, as long as DME is present during the reaction. It is characterized by heteronuclear magnetic resonance and vibrational spectroscopy (IR and Raman), has high thermal stability (Tdecomposition >271 °C, DSC) and shows long-term stability in water. The concentration-dependent electrical conductivity of Li[B(OTfe)4 ] is measured in water, acetone, EC/DMC, EC/DMC/DME, ethyl acetate and THF at RT In DME (0.8 mol L(-1) ) it is 3.9 mS cm(-1) , which is satisfactory for the use in lithium-sulfur batteries (LiSB). Cyclic voltammetry confirms the electrochemical stability of Li[B(OTfe)4 ] in a potential range of 0 to 4.8 V vs. Li/Li(+) . The performance of Li[B(OTfe)4 ] as conducting salt in a 0.2 mol L(-1) solution in 1:1 wt % DME/DOL is investigated in LiSB test cells. After the 40th cycle, 86 % of the capacity remains, with a coulombic efficiency of around 97 % for each cycle. This indicates a considerable performance improvement for LiSB, if compared to the standard Li[NTf2 ]/DOL/DME electrolyte system.

© 2015 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

Keywords: electrolytes; lithium-ion batteries; lithium-sulfur batteries; vibrational spectroscopy; weakly coordinating anions

Publication Types