Результаты исследований: Научные публикации в периодических изданиях › статья › Рецензирование
Overcharge cycling effect on the surface layers and crystalline structure of LiFePO4 cathodes of Li-ion batteries. / Beletskii, Evgenii V.; Alekseeva, Elena V.; Spiridonova, Dar'ya V.; Yankin, Andrei N.; Levin, Oleg V.
в: Energies, Том 12, № 24, 4652, 07.12.2019.Результаты исследований: Научные публикации в периодических изданиях › статья › Рецензирование
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TY - JOUR
T1 - Overcharge cycling effect on the surface layers and crystalline structure of LiFePO4 cathodes of Li-ion batteries
AU - Beletskii, Evgenii V.
AU - Alekseeva, Elena V.
AU - Spiridonova, Dar'ya V.
AU - Yankin, Andrei N.
AU - Levin, Oleg V.
PY - 2019/12/7
Y1 - 2019/12/7
N2 - Electrochemical cells using LiFePO4 cathode material are considered one of the safest and most resistant to overcharging among Li-ion batteries. However, if LiFePO4-based electrodes are exposed to high potentials, surface and structural changes may occur in the electrode material. In this study Li/LiFePO4 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 LiFePO4-based batteries to overcharge, a long overcharge time or high cut-off voltage leads to destructive changes in the cathode and should be avoided.
AB - Electrochemical cells using LiFePO4 cathode material are considered one of the safest and most resistant to overcharging among Li-ion batteries. However, if LiFePO4-based electrodes are exposed to high potentials, surface and structural changes may occur in the electrode material. In this study Li/LiFePO4 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 LiFePO4-based batteries to overcharge, a long overcharge time or high cut-off voltage leads to destructive changes in the cathode and should be avoided.
KW - Li-ion batteries
KW - LiFePO
KW - Lithium iron phosphate
KW - Overcharge
KW - SEI layer
UR - http://www.scopus.com/inward/record.url?scp=85076802497&partnerID=8YFLogxK
U2 - 10.3390/en12244652
DO - 10.3390/en12244652
M3 - Article
AN - SCOPUS:85076802497
VL - 12
JO - Energies
JF - Energies
SN - 1996-1073
IS - 24
M1 - 4652
ER -
ID: 50069280