Gas-Evolution Induced Volume Fraction Changes and Their Effect on the Performance Degradation of Li-Ion Batteries
Gas-Evolution Induced Volume Fraction Changes and Their Effect on the Performance Degradation of Li-Ion Batteries
复制标题
气体逸出引起的体积分数变化及其对锂离子电池性能下降的影响
DOI：
--
复制
发表时间：
2010
期刊：
影响因子：
--
通讯作者：
A. Sastry
中科院分区：
文献类型：
--
作者：
J. Seo;Jonghyun Park;G. Plett;A. Sastry
由于电池内部气体形成而导致的电池膨胀可导致电池性能的严重退化。在电池单元内，放出的气体减少了活性材料和电解质之间的界面面积，从而阻碍了固体电解质界面SEI处的电化学反应。此外，由于气体生成而产生的压力累积导致电极内部的机械应力，这与电极中的局部断裂有关。由于电解质分解和与锂离子电池中的杂质反应而产生气体，因此会发生电池膨胀。1-3
Battery swelling due to internal gas formation in cells can result in severe degradation of battery performance. Within a battery cell, evolved gas reduces the interfacial area between active material and electrolyte, and thus hinders the electrochemical reactions at the solid electrolyte interphase SEI. Also, the pressure buildup due to gas generation results in mechanical stress inside the electrodes, which has been implicated in local fractures in the electrodes. Cell swelling occurs due to gas generation resulting from the decomposition of the electrolyte and from reactions with impurities in Li-ion batteries. 1-3