Impedance Diagnostic for Overcharged Lithium-Ion Batteries
Authors:
- Corey T. LoveCLCorey T. Love
- Karen Swider-LyonsKSKaren Swider-Lyons
- 1 January 2012
- journal article
- research article
- Published by The Electrochemical Society in Electrochemical and Solid-State Letters
- Vol. 15 (4) , A53-A56
Abstract
The impedance response of LiCoO2|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.Keywords
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