Journal
APPLIED THERMAL ENGINEERING
Volume 163, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.applthermaleng.2019.114147
Keywords
Overcharge cycling effect; Thermal behavior; Electrode material; Adiabatic condition; Lithium deposition
Funding
- National Natural Science Foundation of China [51874184]
- Key R&D programs(Social Development) in Jiangsu Province [BE2016771]
- Key Natural Science Foundation in Jiangsu Province [18KJA620003]
- Jiangsu Project Plan for Outstanding Talents Team in Six Research Fields [TD-XNYQC-002]
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The present study investigates the overcharge cycling effect on thermal behavior, structure, and electrode material of lithium-ion batteries (LIB) with a Li-x(Ni0.3Co0.3Mn0.2)O-2 cathode. The thermal behavior of LIBs with different overcharged degrees was studied using vent sizing package 2 and differential scanning calorimetry. Changes in the internal composition of the batteries during overcharge were observed using a scanning electron microscope and an inductively coupled plasma optical emission spectrometer. The results indicate that the overcharge process can be divided into four stages. A battery was more likely to trigger thermal runaway during overcharge under adiabatic conditions than in an ambient environment. During overcharge, the surface temperature of a 150% state-of-charge (SOC) battery was approximately 3.0 degrees C higher than that of a 100% SOC battery. Because of generated gas and lithium deposition during overcharge cycling, the battery thickness increases and coulombic efficiency decreases. The apparent exothermic onset temperature (T-0) of a battery with 150% SOC was 87 degrees C below that of a 100% SOC battery. Cathode material becomes highly reactive when the battery was overcharged to 150% SOC. Here, the released heat was 1026.4 J/g. These results provide feasible support for understanding the overcharge mechanism and battery management system.
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