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A Method for Fast Estimation of the Rate-Limiting Step in Lithium-Ion Batteries

Miran Gaberšček

Abstract


Transport of charge in electrodes for lithium-ion batteries is complex. For accurate description one needs to use a multilevel approach which addresses processes on different scales – from the ones occurring inside active nanoparticles to those governing the transport in composite electrodes or in separators of sub-millimeter thickness. Here we attempt an approximation that allows for a fast estimation of the rate-limiting step in given electrochemical cell. Despite thoroughly simplified description of transport, the method gives suprisingly good prediction of polarisation resistance as a function of charge/discharge rate and of the electrode thickness. The method might be helpful for fast evaluation of new materials or new electrode designs in everyday laboratory testing.

Keywords


Lithium ion batteries; charge transport; electrode thickness; rate performance; electronic wiring

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