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- 2019
聚硅氧烷/聚苯硫醚无纺布复合电池隔膜的制备与性能
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Abstract:
以聚乙烯基硅氧烷（PVS）为涂覆材料，以耐高温聚苯硫醚（PPS）无纺布为支撑材料，通过物理浸涂的方法制备了PVS/PPS无纺布复合锂离子电池隔膜。通过对基本物理性能、电化学性能和电池性能的系统考察，发现与聚烯烃（PP/PE/PP）隔膜相比，PVS/PPS复合隔膜具有较发达的微孔结构、良好的润湿性、较高的离子电导率及良好的界面相容性，有助于降低电池工作时的欧姆极化程度，并使电池表现出较高的放电比容量和良好的循环稳定性（保持率约为100%）。此外研究发现，PVS/PPS复合隔膜具有优异的耐热性，在250℃的高温下热处理1 h后仍能表现出较好的尺寸稳定性。可见，PPS无纺布基复合隔膜在动力型锂离子电池领域具有很大的发展前景。 The polysiloxane/polyphenylene sulfide (PVS/PPS) nonwoven composite separator was first fabricated by employing polyvinylsilsesquioxane (PVS) polymer as the coating material and PPS nonwoven as the substrate. The physical properties, electrochemical behavior and battery performance of the separator were systematically investigated. Compared with polyolefin separator (PP/PE/PP), the PVS/PPS composite separator is discovered to display highly developed microporous structure, superior electrolyte wettability, higher ionic conductivity and enhanced compatibility with electrode. These behaviors can be helpful for weaken ohmic polarization degree in case of charging/discharging, which finally endows battery with higher discharge specific capacity and outstanding cyclic stability (retention rate is ahout 100%). The PVS/PPS composite separator can exhibit excellent heat resistance and dimensional stability even after thermal treatment at 250℃ for 1 h. Accordingly, there is a promising prospect for PPS nonwoven-based composite separator in the development of the high power lithium ion battery. 湖北省教育厅科学技术研究项目（Q20181709
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