Overcharge Cycling Effect on the Surface Layers and Crystalline Structure of LiFePO 4 Cathodes of Li-Ion Batteries

Evgenii V. Beletskii, Elena V. Alekseeva, Dar’ya V. Spiridonova, Andrei N. Yankin and Oleg V. Levin
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Evgenii V. Beletskii: Institute of Chemistry, St. Petersburg State University, St. Petersburg 199034, Russia
Elena V. Alekseeva: Institute of Chemistry, St. Petersburg State University, St. Petersburg 199034, Russia
Dar’ya V. Spiridonova: Research Park, St. Petersburg State University, St. Petersburg 199034, Russia
Andrei N. Yankin: Department of Nanophotonics and Metamaterials, ITMO University, St. Petersburg 197101, Russia
Oleg V. Levin: Institute of Chemistry, St. Petersburg State University, St. Petersburg 199034, Russia

Energies, 2019, vol. 12, issue 24, 1-15

Abstract: Electrochemical cells using LiFePO 4 cathode material are considered one of the safest and most resistant to overcharging among Li-ion batteries. However, if LiFePO 4 -based electrodes are exposed to high potentials, surface and structural changes may occur in the electrode material. In this study Li/LiFePO 4 half-cells were overcharged under different modes with variable cut-off voltages and charge currents. The change in voltage profile, discharge capacity, surface layers composition, and crystalline structure were characterized after overcharge cycles. It was demonstrated that the cathode material is resistant to short-term overcharging up to 5 V, but undergoes irreversible changes with increasing overcharge time or potential. Thus, despite the well-known tolerance of LiFePO 4 -based batteries to overcharge, a long overcharge time or high cut-off voltage leads to destructive changes in the cathode and should be avoided.

Keywords: Li-ion batteries; overcharge; LiFePO 4; SEI layer; lithium iron phosphate (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2019
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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