Quantifying Mass Transport during Polarization in a Li Ion Battery Electrolyte by in Situ 7Li NMR Imaging
By Klett, Matilda; Giesecke, Marianne; Nyman, Andreas; Hallberg, Fredrik; Lindström, Rakel Wreland; Lindbergh, Göran & Furó, István
Published in Journal of the American Chemical Society
NULL
2012
Abstract
Poor mass transport in the electrolyte of Li ion batteries causes large performance losses in high-power applications such as vehicles, and the determination of transport properties under or near operating conditions is therefore important. We demonstrate that in situ 7Li NMR imaging in a battery electrolyte can directly capture the concentration gradients that arise when current is applied. From these, the salt diffusivity and Li+ transport number are obtained within an electrochemical transport model. Because of the temporal, spatial, and chemical resolution it can provide, NMR imaging will be a versatile tool for evaluating electrochemical systems and methods.
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