Abstract
UDC 544.6
The paper presents the results of investigation of electrochemical characteristics of lithium-manganese spinel in electrolytes lithium bis(oxalate)borate LiB(C2O4)2 (LiBOB)–tetraethylenglycol dimethylether (tetraglyme, TG). Dependence of its specific capacity and stability within a wide range of temperature on the LiBOB concentration has been investigated. The results obtained give evidence that lithium-manganese spinel in electrolytes based on the LiBOB–tetraglyme mixtures is characterized by a high specific capacity and ability of stable cycling in a wide temperature range. Conductivity of solutions is determined by the salt concentration, and its temperature dependence is linear in coordinates of the Fogel–Tamman–Fulcher equation within the temperature range 10–100ºC. Investigations have been performed using the lithium anode in cells of the 2016-type disk construction.
Keywords: salt-solvate electrolytes, electrochemical stability, conductivity.