PE隔板的热氧化失效形貌特征研究

Investigation on morphology characterization of deteriorated PE separators due to thermo-chemical oxidation

根据PE隔板粉化样品的光学显微镜分析,发现隔板的粉化特征有两种。一种为有孔洞产生的穿透粉化;一种是出现裂纹的龟裂粉化。经过场发射扫描电镜能谱的微区元素分布的测试,发现PE隔板的白色粉化区域中,主要元素是作为隔板填料的Si和O,而其中碳含量显著降低,甚至测试不到。认为PE隔板在正极板附近强氧化性环境中,发生了热氧化降解反应。而且这个机制是引起粉化失效的主要原因。

The characterization of deteriorated PE separators introducing the short-circuits of lead-acid batteries is analyzed. In the deteriorated region of PE separators there are two types of deteriorated morphology. One is the cracks and another is formation of hole-opening. It is concluded that the deterioration of PE separators is due to thermo-chemical oxidation of PE polymer by the active oxygen atoms and oxygen molecule that are produced in charging process of lead-acid batteries.