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首页> 外文会议>Lithium Battery Symposium Oct 17-22, 1999, Honolulu, Hawaii >THERMAL STABILITY OF Li-ION CELLS
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THERMAL STABILITY OF Li-ION CELLS

机译：锂离子电池的热稳定性

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The thermal stability of Li-ion cells with intercalating carbon anodes and metal oxide cathodes was measured as a function of state of charge and temperature for two advanced cell chemistries. Cells of the 18650 design with Li_xCoO_2 cathodes (commercial SONY cells) and Li_xNi_(0.8)Co_(0.2)O_2 cathodes were measured for thermal reactivity in the open circuit cell condition. Accelerating rate calorimetry (ARC) was used to measure cell thermal runaway as a function of state of charge (SOC). Microcalorimetry was used to measure the time dependence of heat generating side reactions also as a function of SOC. Components of cells were measured using differential scanning calorimetry (DSC) to study the thermal reactivity of the individual electrodes to determine the temperature regimes and conditions of the major thermal reactions. Thermal decomposition of the SEI layer at the anodes was identified as the initiating source for thermal runaway. The cells with Li_xCoO_2 cathodes showed greater sensitivity to SOC and higher accelerating heating rates than seen for the cells with Li_xNi_(0.8)Co_(0.2)O_2 cathodes. Lower temperature reactions starting as low as 40℃ were also observed that were SOC dependent but not accelerating. These reactions were also measured in the microcalorimeter and observed to decay over time with a power-law dependence and are believed to result in irreversible capacity loss in the cells.
机译：对于两种先进的电池化学性质，测量了具有插入式碳阳极和金属氧化物阴极的锂离子电池的热稳定性，其为荷电状态和温度的函数。测量了具有Li_xCoO_2阴极的18650设计电池（商业SONY电池）和Li_xNi_（0.8）Co_（0.2）O_2阴极在开路电池条件下的热反应性。加速率量热法（ARC）用于测量电池热失控与荷电状态（SOC）的关系。微量量热法用于测量发热副反应的时间依赖性，该时间依赖性也是SOC的函数。使用差示扫描量热法（DSC）测量电池成分，以研究单个电极的热反应性，以确定主要热反应的温度和条件。阳极处SEI层的热分解被确定为热失控的引发源。与具有Li_xNi_（0.8）Co_（0.2）O_2阴极的电池相比，具有Li_xCoO_2阴极的电池显示出更高的SOC敏感性和更高的加速加热速率。还观察到始于40℃的较低温度反应，这些反应取决于SOC，但并没有加速。这些反应也在微量量热仪中进行了测量，并观察到随着时间的流逝随幂律的变化而衰减，并且据信会导致细胞中不可逆的容量损失。

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