Diagnostic examination of thermally abused high-power lithium-ion cells
Diagnostic examination of thermally abused high-power lithium-ion cells
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DOI：
10.1016/j.jpowsour.2006.04.088
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发表时间：
2006-10-20
影响因子：
9.2
通讯作者：
Doughty, D. H.
中科院分区：
文献类型：
--
作者：
Abraham, D. P.;Roth, E. P.;Doughty, D. H.
锂离子电池固有的热不稳定性是其在混合动力汽车应用中广泛商业化的重大障碍。含有传统有机电解质化学物质的电池在 180 摄氏度左右的温度下容易发生热失控。我们对高功率 18650 型锂离子电池进行了加速量热测量，试图破译导致热失控的事件顺序。此外，通过显微镜、光谱学和衍射技术对从加热至 150 摄氏度然后空气淬火至室温的电池中采集的电极和隔膜样品进行了检查。电池在 84 摄氏度时开始自加热。电池中产生的气体包括 CO2 和 CO，以及少量的 H-2、CH4、CH4 和 C2H6。电池加热至 150 摄氏度时的主要变化是在阳极表面观察到的，阳极表面覆盖着一层厚厚的表面沉积物，其中包括 LiF 以及无机和有机磷酸盐化合物。讨论了气体产生的来源以及导致电极表面上观察到的化合物形成的机制。 (c) 2006 Elsevier B.V. 保留所有权利。
The inherent thermal instability of lithium-ion cells is a significant impediment to their widespread commercialization for hybrid-electric vehicle applications. Cells containing conventional organic electrolyte-based chemistries are prone to thermal runaway at temperatures around 180 degrees C. We conducted accelerating rate calorimetry measurements on high-power 18650-type lithium-ion cells in an effort to decipher the sequence of events leading to thermal runaway. In addition, electrode and separator samples harvested from a cell that was heated to 150 degrees C then air-quenched to room temperature were examined by microscopy, spectroscopy, and diffraction techniques. Self-heating of the cell began at 84 degrees C. The gases generated in the cell included CO2 and CO, and smaller quantities of H-2, CH4, CH4, and C2H6. The main changes on cell heating to 150 degrees C were observed on the anode surface, which was covered by a thick layer of surface deposits that included LiF and inorganic and organo-phosphate compounds. The sources of gas generation and the mechanisms leading to the formation of compounds observed on the electrode surfaces are discussed. (c) 2006 Elsevier B.V. All rights reserved.