【摘 要】
：
聚烯烃类薄膜以其出众的化学稳定性，优良的机械性能以及其热关闭性能被广泛应用在锂离子电池领域，但由于低表面能和较差的热稳定性能使其已经不能满足高能量密度，高安全性能锂离子电池的需求.针对目前涂布材料的问题，本课题组从材料设计出发，通过有机/无机复合增强PE隔膜.首先探索了原位水解法制备CDA/SiO2复合涂层，并探讨了SiO2前驱体正硅酸四乙酯对涂层孔结构的调控机制及电化学性质的影响；其次通过接枝反
【出 处】
：
2016 中国国际新能源材料及动力电池高峰论坛暨第八届中国储能与动力电池及其关键材料学术研讨与技术交流会
论文部分内容阅读
聚烯烃类薄膜以其出众的化学稳定性，优良的机械性能以及其热关闭性能被广泛应用在锂离子电池领域，但由于低表面能和较差的热稳定性能使其已经不能满足高能量密度，高安全性能锂离子电池的需求.针对目前涂布材料的问题，本课题组从材料设计出发，通过有机/无机复合增强PE隔膜.首先探索了原位水解法制备CDA/SiO2复合涂层，并探讨了SiO2前驱体正硅酸四乙酯对涂层孔结构的调控机制及电化学性质的影响；其次通过接枝反应合成水性二醋酸纤维素(WCDA)，并利用其优良的粘结性与SiO2纳米颗粒复合增强纯PE隔膜，得到WCDA-SiO2改性的PE隔膜拥有优异的热稳定性能，在200oC下隔膜基本不收缩；机械强度得到明显的提高，尤其是抗穿刺强度提高到7.64 MPa；然后还探索了利用不同纤维素通过三维交联增强隔膜的机械性能和电化学性能.
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