Quantifying mass transport during polarization in a Li ion battery electrolyte by in situ 7Li NMR imaging.
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.
Division of Applied Electrochemistry, Department of Chemical Engineering and Technology, KTH Royal Institute of Technology, SE-10044 Stockholm, Sweden.
Matilda
M
Klett
Marianne
M
Giesecke
Andreas
A
Nyman
Fredrik
F
Hallberg
Rakel Wreland
RW
Lindström
Göran
G
Lindbergh
István
I
Furó