Thermal–electrochemical effect on the degradation of lithium-ion batteries during the charging process

• Published in: International communications in heat and mass transfer Vol. 158; p. 107855
• Main Authors: Kim, Ryanghoon, Kim, Youngkyo, Lee, Do Hyun, Kim, Sangwon, Kim, Dong Kyu
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01.11.2024
• Subjects: Battery degradation; Charging process; Lithium plating; Lithium-ion batteries; Solid electrolyte interphase layer; Thermal–electrochemical effect; Lithium-ion batteries; Charging process; Battery degradation; Solid electrolyte interphase layer; Lithium plating; Thermal–electrochemical effect
• ISSN: 0735-1933
• DOI: 10.1016/j.icheatmasstransfer.2024.107855

This study analyzes the growth of the solid electrolyte interphase (SEI) layer and lithium plating under various charging conditions. By examining the thermal–electrochemical effect on degradation, the proper charge conditions for alleviating degradation can be understood. First, we analyzed the degradation mechanism during the charging process. After 100 cycles, the SEI layer increased by 30%, resulting in an increase in ohmic loss. The growth of lithium plating increased to approximately 5.2 × 10−2 nm, causing concentration loss. Then, we analyzed the effect of charge rate (C-rate) on degradation. When the C-rate increased from 1C to 1.5C, the charge capacity decreased by 80% at the 100th cycle because a large number of lithium ions reacted at the high C-rate, resulting in a thick SEI layer and lithium plating. The effect of temperature was analyzed as well. When the temperature was 5 °C, the charge capacity decreased by 75% owing to low diffusivity in the electrolyte. Finally, thermal-electrochemical effect on degradation was analyzed. By lowering the C-rate and increasing temperature, 0.3 V of the overpotential can be lowered. In order to mitigate the degradation of the battery, it is recommended to lower the C-rate and higher the temperature as charging proceed. •Thermal-electrochemical effect on Battery degradation mechanism is analyzed.•Growth of SEI affects ohmic loss and growth of lithium plating affects concentration loss.•Generation of SEI and lithium plating actively occurs at high C-rate and low temperature.•By controlling C-rate and temperature, degradation can be alleviated during cycling.