Calendar aging of lithium titanate battery with different state of charge

doi:10.19799/j.cnki.2095-4239.2023.0121

Abstract

Abstract:

Lithium titanate (LTO) batteries have potential applications in energy storage owing to their long cycling life and good thermal safety. However, limited studies have focused on the calendar aging of LTO batteries under high temperatures. The state of charge (SOC) and the environment temperature are generally recognized as the key parameters affecting the performance changes during the calendar aging process of LTO batteries. Herein, the evolution of electrochemical performance and the underlying mechanisms of commercial cylindrical LTO batteries were examined under high-temperature storage at different SOC levels (0%, 50%, and 100%) through accelerated aging experiments. The experimental results reveal a strong SOC dependence on the state of health of LTO batteries during high-temperature aging. Furthermore, the capacity evolution of batteries under various SOC levels shows different trends over time, driven by varying mechanisms. This study mainly reveals the influence of SOC on the performance of LTO batteries during high-temperature storage, providing valuable insights for future operation and maintenance of large-scale energy storage systems based on LTO batteries.

Key words: state of charge, LTO battery, calendar aging, capacity attenuation

CLC Number:

TM 911.3

Honghui WANG, Yifan LIU, Deren CHU. Calendar aging of lithium titanate battery with different state of charge[J]. Energy Storage Science and Technology, 2023, 12(8): 2606-2614.

Figures/Tables 8

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