Comparison of Apparent Thermal Deterioration and Charge/discharge Activation Energies of Commercial Lithium-ion Secondary Cell
Comparison of Apparent Thermal Deterioration and Charge/discharge Activation Energies of Commercial Lithium-ion Secondary Cell
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商用锂离子二次电池的表观热劣化和充放电活化能比较
DOI：
10.2116/bunsekikagaku.62.1029
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发表时间：
2013
期刊：
影响因子：
--
通讯作者：
I. Uchida
中科院分区：
文献类型：
--
作者：
石川 洋明;梅田 実;曽根 理嗣;内田 勇;H. Ishikawa;M. Umeda;Y. Sone;I. Uchida
通过改变锂离子二次电池的荷电状态，研究了在70̶、100℃下储存的锂离子二次电池的性能。为了评估材料的热劣化特性，我们根据热危害前后的放电容量估算了活化能。另一方面，通过对锂离子二次电池的高温阻抗谱测试，确定了锂离子二次电池的充放电活化能，利用等效电路由电化学参数确定了充放电活化能。根据这一分析，已知劣化的激活能大约是充放电激活能的两倍。充放电和劣化反应是相互独立的；然而，为了理解锂离子二次电池在非加热条件下发生的热劣化，对这些活化能的比较是一个重要的因素
of the lithium-ion secondary cell stored at 70 ̶ 100 ℃ were investigated by varying the state of charge (SOC). To evaluate the thermal-deterioration characteristics, we estimated the activation energy from the discharge capacities before and after a heat hazard. On the other hand, impedance spectroscopy measurements of lithium-ion secondary cells at elevated temperature were carried out to determine the activation energy of charge/discharge, which is determined from the electrochemical parameters by using an equivalent circuit. Based on this analysis, the activation energy of the deterioration is known to be about two-times greater in magnitude than the activation energy of the charge/discharge. The charge/ discharge and deterioration reactions are independent of each other; however, a comparison of these activation energies is an important element in order to understand the thermal deterioration of lithium-ion secondary cells that takes place in the non-heating