The impedance response of LiCoO 2 |C battery cells is exploited to develop a single-frequency (500 Hz) diagnostic tool to detect overcharge abuse. The impedance data are reversible at all states-of-charge during normal charge/discharge operations (2.8–4.2 V), with little change in Z ′ or Z ″ at 500 Hz even after 200 cycles. However, a single 4.6 V overcharge shows clear differentiation in the impedance values at 500 Hz, which is responsive to the cell passivation layers, with the Z ′ and Z ″ first decreasing and then irreversibly increasing with cycling. Thus, this single-frequency impedance method provides a simple means of monitoring battery health.
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Love et al. (2012) studied this question.
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