Overcharge cycling effect on the thermal behavior, structure, and material of lithium-ion batteries

• Published in: Applied thermal engineering Vol. 163; p. 114147
• Main Authors: Mao, Ning, Wang, Zhi-Rong, Chung, Yi-Hong, Shu, Chi-Min
• Format: Journal Article
• Language: English
• Published: Oxford Elsevier Ltd 25.12.2019; Elsevier BV
• Subjects: Adiabatic condition; Adiabatic conditions; Batteries; Cathodes; Cycles; Differential scanning calorimetry; Efficiency; Electrode material; Electrode materials; Exothermic reactions; Heat transfer; Inductively coupled plasma; Lithium; Lithium deposition; Lithium-ion batteries; Overcharge cycling effect; Power management; Rechargeable batteries; State of charge; Studies; Thermal behavior; Thermal runaway; Thermodynamic properties; Adiabatic condition; Electrode material; Overcharge cycling effect; Lithium deposition; Thermal behavior
• ISSN: 1359-4311; 1873-5606
• DOI: 10.1016/j.applthermaleng.2019.114147

•Battery is more likely to cause thermal runaway in adiabatic than ambient atmosphere.•The overcharge process can be divided into four stages in an adiabatic environment.•The lower CE and earlier thermal runaway appears at a higher SOC.•The most dangerous overcharge region in the battery overcharges at 150% SOC. The present study investigates the overcharge cycling effect on thermal behavior, structure, and electrode material of lithium-ion batteries (LIB) with a Lix(Ni0.3Co0.3Mn0.2)O2 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 °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 (T0) of a battery with 150% SOC was 87 °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.