Quantifying Mass Transport during Polarization in a Li Ion Battery Electrolyte by in Situ (7)Li NMR Imaging |
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| Authors: | Matilda Klett Marianne Giesecke Andreas Nyman Fredrik Hallberg Rakel Wreland Lindström Göran Lindbergh István Furó |
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| Institution: | Division of Applied Electrochemistry, Department of Chemical Engineering and Technology, and ?Division of Applied Physical Chemistry, Department of Chemistry, KTH Royal Institute of Technology , SE-10044 Stockholm, Sweden. |
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| 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 (7)Li 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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