储能科学与技术 ›› 2023, Vol. 12 ›› Issue (8): 2606-2614.doi: 10.19799/j.cnki.2095-4239.2023.0121

• 储能测试与评价 • 上一篇    下一篇

不同荷电状态钛酸锂电池高温日历老化研究

汪红辉1,3(), 刘一凡2,3, 储德韧1,3()   

  1. 1.上海化工研究院有限公司
    2.上海化工院检测有限公司
    3.工信部工业产品（电池）质量 控制和技术评价实验室，上海 200062
  • 收稿日期:2023-03-08 修回日期:2023-04-03 出版日期:2023-08-05 发布日期:2023-08-23
  • 通讯作者: 储德韧 E-mail:whh@ghs.cn;cdr@ghs.cn
  • 作者简介:汪红辉（1992—），男，博士，工程师，研究方向为电池安全检测、失效分析，E-mail：whh@ghs.cn；
  • 基金资助:
    上海市国资委“城市本质安全风险防控预警技术及应急处置体系数字化服务平台—新能源车电池安全防爆检测关键技术研究”(2021012)

Calendar aging of lithium titanate battery with different state of charge

Honghui WANG1,3(), Yifan LIU2,3, Deren CHU1,3()   

  1. 1.Shanghai Research Institute of Chemical Industry Co. , Ltd.
    2.Shanghai Institute of Chemical Industry Testing Co. , Ltd.
    3.Laboratory for Quality Control and Technical Evaluation of Industrial Products (Battery), Ministry of Industry and Information Technology, Shanghai 200062, China
  • Received:2023-03-08 Revised:2023-04-03 Online:2023-08-05 Published:2023-08-23
  • Contact: Deren CHU E-mail:whh@ghs.cn;cdr@ghs.cn

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摘要：

钛酸锂电池因循环稳定性和安全性好等优点在能源存储领域具有潜在应用前景，然而目前关于其在高温条件下的日历老化研究报道较少。荷电状态和环境温度通常被认为是影响钛酸锂电池在日历老化过程中性能演化的关键参量。本工作以某商用圆柱形钛酸锂电池为研究对象，通过高温加速老化模拟实验，探究在不同荷电状态下(0%、50%、100% SOC)钛酸锂电池电化学性能演化规律及机理。实验结果表明，钛酸锂电池在高温日历老化过程中的健康状态与荷电状态存在强相关性，以不同荷电状态储存的电池，其容量呈现出随时间不同的变化趋势，其内在机理也有所不同。本工作主要揭示了荷电状态对高温储存下钛酸锂电池性能的影响规律和作用机理，对于钛酸锂电池未来在大规模储能应用中的运行维护具有一定科学指导意义。

关键词: 荷电状态, 钛酸锂电池, 日历老化, 容量衰减

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

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