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Synthesis, Spectroscopic Characterization, Crystal Structures, Energetics, and Thermal Stabilities of Li[AlX 4 ] (X = Cl, Br): Investigation and Performance of Their Electrolyte Solutions
Author(s) -
Scholz Franziska,
Unkrig Wiebke,
Eiden Philipp,
Schmidt Michael A.,
Garsuch Arnd,
Krossing Ingo
Publication year - 2015
Publication title -
european journal of inorganic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 1434-1948
DOI - 10.1002/ejic.201500254
Subject(s) - chemistry , solubility , electrolyte , inorganic chemistry , lithium (medication) , ion , electrochemistry , crystal structure , solvent , conductivity , ionic conductivity , crystallography , organic chemistry , electrode , medicine , endocrinology
Lithium chloro‐ and bromoaluminates were prepared, fully characterized, and investigated as conducting salts for battery applications. In addition, thermodynamic investigations of their lattice enthalpies and other quantities were carried out. The Li[AlX 4 ] salts also show very high conductivities in solvents of very low polarity, which makes them suitable candidates for conducting salts and battery systems working with voltages below ca. 3.5 V (X = Br) or ca. 4.4 V (X = Cl), such as lithium‐sulfur batteries (LSBs). In particular, the bromoaluminates, with their Pearson‐soft character, which prevents ion‐pair formation with the Pearson‐hard lithium ion, are promising for this purpose. An interesting alternative solvent for LSBs might be o ‐difluorobenzene, in which Li[AlBr 4 ] shows very high solubility and conductivity. The carbonate solvents typically used for LIBs are not suitable for the bromoaluminates, and Li[AlCl 4 ] also shows corrosive behavior towards aluminum at potentials higher than 2.5 V. This can be prevented by, for example, addition of Li[PF 6 ].