Experimental investigations on the correlations between the structure and thermal-electrochemical properties of over-discharged ternary/Si-C power batteries,International Journal of Energy Research

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Experimental investigations on the correlations between the structure and thermal-electrochemical properties of over-discharged ternary/Si-C power batteries
International Journal of Energy Research ( IF 4.3 ) Pub Date : 2021-09-19 , DOI: 10.1002/er.7274
Jiangyun Zhang ₁ , Xinxi Li ₁ , Guoqing Zhang ₁ , Hongwei Wu ₂ , Dan Shao ₃ , Xin Ge ₁ , Qiqiu Huang ₁ , Zhicheng Zhen ₁ , Xuanzhuang Chen ₁

Affiliation

The thermal safety of power lithium-ion batteries (LIBs) has seriously affected the booming development of electric vehicles (EVs). Especially, owing to the requirement of high energy density, thermal runaway (TR) easily occurs in LIBs, resulting in a higher heat generation rate. Over-discharging is recognized as a common cause for TR. In the present research, the correlations between the structure and thermal-electrochemical properties of an over-discharged ternary/Si-C battery at room and high temperatures were investigated. The heat generation mechanisms of the batteries due to the maximum surface temperature and peak temperature difference variations during fast charging and discharging processes were investigated. Moreover, the electrochemical performances parameters of the batteries, such as voltage changing trend, discharge time, discharge capacity, internal resistance, electrochemical impedance spectroscopy (EIS) spectra, were analyzed. When the battery was discharged at 2.0C and 55°C, its maximum temperature and highest temperature difference reached 91.34°C and 13.24°C, respectively, finally resulting in a sharp decline in electrochemical performance. Furthermore, the root reasons for performance degradation and heat generation intensification of the over-discharged battery were analyzed by scanning electron microscopy and X-ray diffraction. The cause of the aforementioned phenomenon is due to irreversible damage to the electrode materials. This research not only reveals the relevant relationship between the thermal behavior and the microscopic structure of the over-discharged ternary/Si-C battery under various temperature conditions but also provides valuable insights for improving the safety of LIBs modules even packs.

中文翻译：

过放电三元/Si-C动力电池结构与热电化学性能相关性的实验研究

动力锂离子电池（LIB）的热安全性严重影响了电动汽车（EV）的蓬勃发展。特别是由于对高能量密度的要求，LIBs容易发生热失控（TR），导致发热率较高。过度放电被认为是 TR 的常见原因。在本研究中，研究了过放电三元/Si-C 电池在室温和高温下的结构和热电化学性能之间的相关性。研究了电池在快速充放电过程中由于最大表面温度和峰值温差变化而产生的发热机制。此外，电池的电化学性能参数，如电压变化趋势、放电时间、对放电容量、内阻、电化学阻抗谱（EIS）谱进行了分析。当电池在2.0C和55°C放电时，其最高温度和最高温差分别达到91.34°C和13.24°C，最终导致电化学性能急剧下降。此外，通过扫描电子显微镜和X射线衍射分析了过放电电池性能下降和发热加剧的根本原因。产生上述现象的原因是由于电极材料受到了不可逆的破坏。

更新日期：2021-09-19

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