ORGA and temperature

Transport and thermodynamic properties are integral parameters to understand, model and optimise state-of-the-art and next-generation battery electrolytes.  The accurate measurement of these properties is experimentally challenging as well as time and resource intensive, and consequently reports are scarce.  Their dependence on temperature has been explored to an even lesser degree, and is commonly limited to a few temperature points.

The authors of this paper* recently introduced an Operando Raman Gradient Analysis (ORGA) tool to extract transport and thermodynamic properties.  In this paper the authors expand the capabilities of ORGA by incorporating a temperature-sensitive external reference into the design.  With this enhancement they were able to visualise the local concentration of any Raman-active species in the electrolyte and to detect lithium filament nucleation.  They demonstrate and validate this new functionality of ORGA through an examination of lithium bis(fluorosulfonyl)imide (LiFSI) in tetraethylene glycol dimethyl ether (G4) as a function of temperature.  They report on all transport properties and discuss the effect of temperature.

* 'Operando Raman Gradient Analysis for Temperature-Dependent Electrolyte Characterization' as published in ACS Energy Letters.