Abstract
Lithium bis(oxalato) borate (LiBoB) is promising lithium salt for electrolyte solutions of lithium-ion and lithium batteries because of high thermal and hydrolytic stability as well as high electrochemical stability of BoB- anion in wide potential range [1,2]. Sulfones are promising solvents and co-solvents for high-voltage batteries [3-7]. Sulfolane (tetramethylene sulfone) is the most known representative of sulfones. It has high dielectric permittivity (43.3 at 30 °C), high oxidizing stability (≥5 V vs. Li/Li+), high flash point (> 166 °C [8]) and low toxicity [3-5]. This work summarizes the results of studies on the conductivity, viscosity, electrochemical and thermal stability of LiBoB solutions in sulfolane with concentration range of 6·10-4 – 1.1 mol L-1. The maximum of specific conductivity is 1,7·10-3 S·cm-1 at 30 ºС and corresponds to ~0.8 mol L-1 (Fig. a). Activation energy of conductivity of 1M LiBoB in sulfolane is 23.3±0.5 kJ mol-1. Solutions of LiBoB in sulfolane are viscous (Fig. b). Activation energy of viscous flow for 1M LiBoB in sulfolane is 29.4±0.5 kJ mol-1. Association constant and limiting molar conductivity (λ0) of LiBoB in sulfolane are 6 mol-1·L and 8·10-4 S·m2·mol-1, correspondingly. The decomposition temperature (temperature at the initial decomposition) of 1M LiBoB in sulfolane is 286 °C, estimated by DSC method (Fig. c), and 260 °C, estimated by DTA method (Fig. d). Anodic stability of 1M LiBoB in sulfolane is ~5.8 V vs. Li/Li+, estimated at Pt working electrode. Therefore, lithium bis(oxalato) borate dissociates well in sulfolane, its solution has moderate conductivity, high thermal and electrochemical stability. Figure. Isotherms of specific conductivity (a) and dynamic viscosity (b) of LiBoB solutions in sulfolane; DSC (c) and DTA (d) of 1M LiBoB in sulfolane. This work was performed as part of a Government Order to Ufa Institute of Chemistry of the Russian Academy of Sciences by the Ministry of Science and Higher Education of the Russian Federation (Theme No. AAAA-A17-117011910031-7). References R. Younesi, G. M. Veith, P. Johansson, K. Edstrӧm, T. Vegge // Energy Environ. Sci., 2015, 8, pp. 1905-1922.Z. Liu, J. Chai, G. Xu, Q. Wang, G. Cui //Coordination Chemistry Reviews, 2015, 292, pp. 56-73.K. Xu // Chemical Reviews, 2004, 104 (10), pp. 4303-4417.A. Abouimrane, I. Belharouak, K. Amine // Electrochemistry Communications, 2009, 11, pp. 1073-1076.N. Shao, X.-G. Sun, S. Dai, D. Jiang // J. Phys. Chem. B., 2011, 115, pp. 12120-12125.S. Li, W. Zhao, C. Xiaoling, Y. Zhao, B. Li, H. Zhang, Y. Li, G. Li, X. Ye, Y. Luo // Electrochimica Acta, 2013, 91, pp. 282-292.F. Wu, H. Zhou, Y. Bai, H. Wang, C. Wu // ACS Appl. Mater. Interfaces, 2015, 7 (27), pp. 15098-15107.Electrolytes for Lithium and Lithium-Ion Batteries / Editors T. R. Jow, K. Xu, O. Borodin, M. Ue. // Modern Aspects of Electrochemistry, Springer, 2014, V. 58, 476 p. DOI: 10.1007/978-1-4939-0302-3. Figure 1
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.