Zhang Xiao-Feng, Zhao Yan, Patel Yatish, Zhang Teng, Liu Wei-Ming, Chen Mu, Offer Gregory J, Yan Yue
Beijing Institute of Aeronautical Materials (BIAM), P.O. Box 81-83, Beijing 100095, China.
Phys Chem Chem Phys. 2017 Apr 12;19(15):9833-9842. doi: 10.1039/c6cp08505a.
Effective thermal management and tracking of battery degradation are two key challenges in the improved management of battery packs. Entropy change measurement is a non-destructive tool for characterizing both the thermal and structural properties of lithium batteries. However, conventional entropy measurements based on discontinuous potentiometric methods are too time-consuming for practical implementation in battery packs. We present a comprehensive review of potentiometric methods for the entropy change measurement of lithium batteries. We compare conventional and improved discontinuous methods as well as a fully continuous method. Entropy measurements were then made using all the techniques for a solid-state microbattery using a bespoke test system utilising Peltier elements for rapid temperature control. The trade-off between accuracy and speed for the different methods is discussed in detail. In conclusion, the improved discontinuous measurement with significantly reduced voltage relaxation time is recommended for the determination of entropy change during the lithiation/delithiation intercalation reaction in lithium batteries.
有效的热管理和电池退化跟踪是改进电池组管理中的两个关键挑战。熵变测量是一种用于表征锂电池热性能和结构性能的无损工具。然而，基于不连续电位法的传统熵测量对于在电池组中实际应用来说耗时过长。我们对锂电池熵变测量的电位法进行了全面综述。我们比较了传统和改进的不连续方法以及一种完全连续的方法。然后使用定制测试系统，利用珀尔帖元件进行快速温度控制，采用所有技术对固态微型电池进行熵测量。详细讨论了不同方法在准确性和速度之间的权衡。总之，对于确定锂电池锂化/脱锂嵌入反应过程中的熵变，建议采用电压弛豫时间显著缩短的改进不连续测量方法。
