The Influence of Solvents and Salts on the Properties of High-Voltage Cathode Materials
Kazda, T. (Brno University and Technology. Department of Electrical and Electronic Technology)
Vondrák, J. (Brno University and Technology. Department of Electrical and Electronic Technology)
Sedlaříková, M. (Brno University and Technology. Department of Electrical and Electronic Technology)
Gómez-Romero, Pedro 1959- (Institut Català de Nanociència i Nanotecnologia)
Musil, M. (Brno University and Technology. Department of Electrical and Electronic Technology)
Čudek, P. (Brno University and Technology. Department of Electrical and Electronic Technology)
Straková, A. Fedorková (Brno University and Technology. Department of Electrical and Electronic Technology)
Kašpárek, V. (Brno University and Technology. Central European Institute of Technology)

Data:	2015
Resum:	Lithium - ion batteries play an increasingly important role in the battery industry and they have become the dominant source of energy in the recent years, especially for portable electronic devices due to their high gravimetric energy density. This article examines the influence of mixtures of solvents with different combinations of lithium salts on the stability of two types of high-voltage cathode materials: LiNi0. 5Mn1. 5O4 and LiCr0. 1Ni0. 4Mn1. 5O4 produced by a solid phase reaction. These materials were combined with several different electrolytes, cycled at various loads and higher temperature. Various combinations of solvents ethylene carbonate (EC), dimethyl carbonate (DMC) and Tetrahydrothiophene 1. 1-dioxide (Sulfolane) were used for these measurements. Salts LiPF6, LiNO3 and LiTFSI were used. The influence of solvents and salts on the properties of high-voltage cathode materials was tested by cycling at different current loads and by cycling at high temperature. It was found out, by LSV analysis, that the addition of Sulfolane increases the stability of electrolyte. The addition of chromium to the cathode material LiNi0. 5Mn1. 5O4 causes increasing of capacity and stability at high temperature. The combination of the cathode material LiCr0. 1Ni0. 4Mn1. 5O4 with the electrolyte 1. 5 M LiPF6 EC:DMC:Sulfolane 1:2:1 w/w/w leads to increased stability in comparison with other electrolytes.
Drets:	Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, la comunicació pública de l'obra i la creació d'obres derivades, fins i tot amb finalitats comercials, sempre i quan es reconegui l'autoria de l'obra original.
Llengua:	Anglès
Document:	Article ; recerca ; Versió publicada
Matèria:	Lithium ion battery ; LiNi0.5Mn1.5O4 ; Electrolyte ; Sulfolane
Publicat a:	International journal of electrochemical science, Vol. 10, Issue 8 (August 2015) , p. 6288-6301, ISSN 1452-3981

DOI: 10.1016/S1452-3981(23)06719-6

14 p, 1.4 MB

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