Haoze Chen , Ahmed Chahbaz , Sijia Yang , Weige Zhang , Dirk Uwe Sauer , Weihan Li
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引用次数: 0
摘要
与基于石墨的锂离子电池相比,基于钛酸锂(LTO)的锂离子电池具有更长的使用寿命、更高的功率能力和更低的生命周期成本,可用于储能和电动交通应用。然而,LTO 电池在高低充电状态(SOC)区间和不同放电截止电压下的降解机制尚未得到明确研究。本研究调查了高功率锂 4Ti5O12/LiCoO2 电池在五个独立的 SOC 间隔、20% 的放电深度 (DOD) 和三种放电截止电压下与应用相关的寿命性能。结果表明,当电池在较低的 SOC 间隔内循环或使用较低的截止电压时,降解率会显著增加。此外,在 20% DOD 循环时,热力学降解更为显著,而在 100% DOD 循环时,动力学降解占主导地位。就热力学降解而言,决定性的降解模式是负极活性材料的损耗,而阴极活性材料的损耗对平衡电压曲线的影响更大。动力学降解主要是由于阴极的电荷转移过程和扩散过程较慢,从而增加了极化阻抗。
Thermodynamic and kinetic degradation of LTO batteries: Impact of different SOC intervals and discharge voltages in electric train applications
Lithium-titanate-oxide (LTO) based lithium-ion batteries show promise for longer lifespan, higher power capability, and lower life cycle cost for energy storage and electric transportation applications than graphite-based counterparts. However, the degradation mechanisms of LTO-based cells in the high and low state-of-charge (SOC) intervals and different discharge cut-off voltages are not clearly investigated. In this study, the application-related lifetime performance of high-power Li4Ti5O12/LiCoO2 batteries is investigated at five independent SOC intervals with 20 % depth-of-discharge (DOD) and three discharge cut-off voltages. Our results show that degradation increases significantly when the batteries are cycled within lower SOC intervals or with lower cut-off voltages. Additionally, thermodynamic degradation is more significant when cycled at 20 % DOD, while kinetic degradation dominates at 100 % DOD. For thermodynamic degradation, the determining degradation mode is shown to be the loss of active material in the negative electrode, while the active material loss at the cathode has a greater impact on the equilibrium voltage curve. The kinetic degradation is mainly due to the slower charge transfer process and diffusion process at the cathode, which increases polarization impedance.
期刊介绍:
eTransportation is a scholarly journal that aims to advance knowledge in the field of electric transportation. It focuses on all modes of transportation that utilize electricity as their primary source of energy, including electric vehicles, trains, ships, and aircraft. The journal covers all stages of research, development, and testing of new technologies, systems, and devices related to electrical transportation.
The journal welcomes the use of simulation and analysis tools at the system, transport, or device level. Its primary emphasis is on the study of the electrical and electronic aspects of transportation systems. However, it also considers research on mechanical parts or subsystems of vehicles if there is a clear interaction with electrical or electronic equipment.
Please note that this journal excludes other aspects such as sociological, political, regulatory, or environmental factors from its scope.