4) Measuring tool
AFLMBs are appropriate for measuring the reversibility of Li. In the
case of LMBs, the cycle stability is often exaggerated by thick Li
metal, hiding the degradation of active Li until the depletion of the Li
reservoir.[66,67] Therefore, LMBs are not suitable
systems for measuring the true reversibility of Li. For AFLMBs, however,
the CEs directly present the consumption of Li in every cycle because
the inactivated Li is not compensated. Therefore, an anode-free
configuration was used to determine the degree of reversibility of
Li.[57,66]