Journal
JOURNAL OF POWER SOURCES
Volume 307, Issue -, Pages 806-814Publisher
ELSEVIER
DOI: 10.1016/j.jpowsour.2016.01.033
Keywords
Lithium-ion battery; Low temperature aging; Charging method; Lithium plating; State-of-charge distribution; Post-mortem analysis
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The aging of graphite anodes in prismatic lithium ion cells during a low temperature pulse charging regime was studied by electrical tests and post-mortem analysis. The capacity decrease and impedance increase mainly occurs in the beginning of cycling and lithium plating was identified as the major aging mechanism. The degradation and the local states of charge show an inhomogeneous distribution over the anode, which is confirmed from spatially resolved XRD studies and SEM combined with EDX performed on electrode cross sections. Comparing a charged cell with a discharged cell reveals that ca. 1/3 of the lithium is plated reversibly at the given SOH of 60%. It is proposed that high charge rates at low temperatures induce inhomogeneities of temperature and anode utilization resulting in inhomogeneous aging effects that accumulate over lifetime. (C) 2016 Elsevier B.V. All rights reserved.
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