State Key Laboratory of Fire Science, University of Science and Technology of China, Hefei 230026, China.
State Key Laboratory of Fire Science, University of Science and Technology of China, Hefei 230026, China.
J Hazard Mater. 2018 Feb 15;344:733-741. doi: 10.1016/j.jhazmat.2017.11.022. Epub 2017 Nov 13.
The thermal stability evaluation of materials in a soft-pack commercial cell is tested using C80 calorimeter, including anode, cathode, separator and full cell (mixing of the three materials including additional electrolyte). Thermal runaway characteristic of the commercial cell is tested on the accelerating rate calorimeter (ARC) with two heating modes, including internal heating mode and external heating mode. The results show that the thermal stability of internal material for tested cell follows the below order: anode<separator<cathode. The voltage drop is influenced by the consumption of cathode and separator, while the effect of anode consumption on the voltage can be negligible. Both onset temperature and critical temperature in external heating mode are larger than that in internal heating mode. Thermal runaway induced by high temperature of the tested cell can be divided into three stages: 1) the cell can work under normal mode and all the internal exothermal reaction can be ignorable, 2) the exothermal of anode which can be detected and the thermal runaway can be stopped by effective heat dissipation, and 3) the cathode reaction and separator melting which cause the cell voltage drop and thermal runaway of the cell is inevitable in this stage.
使用 C80 量热仪对软包商用电池中的材料进行热稳定性评估，包括阳极、阴极、隔膜和全电池（三种材料的混合，包括额外的电解质）。在加速率量热仪（ARC）上使用两种加热模式，包括内部加热模式和外部加热模式来测试商用电池的热失控特性。结果表明，测试电池的内部材料的热稳定性遵循以下顺序：阳极<隔膜<阴极。电压降受阴极和隔膜消耗的影响，而阳极消耗对电压的影响可以忽略不计。外部加热模式的起始温度和临界温度均大于内部加热模式。由测试电池高温引起的热失控可分为三个阶段：1）电池可在正常模式下工作，所有内部放热反应均可忽略不计；2）阳极的放热可以被检测到，并且通过有效的散热可以阻止热失控；3）在这个阶段，阴极反应和隔膜熔化导致电池电压下降，电池的热失控是不可避免的。
