Kim Ki Jae, Kwon Hyuk Kwon, Park Min-Sik, Yim Taeeun, Yu Ji-Sang, Kim Young-Jun
Advanced Batteries Research Center, Korea Electronics Technology Institute, 68 Yatap-dong, Bundang-gu, Seongnam 463-816, Republic of Korea.
Phys Chem Chem Phys. 2014 May 28;16(20):9337-43. doi: 10.1039/c4cp00624k.
We introduce a ceramic composite separator prepared by coating moisturized ZrO2 nanoparticles with a poly(vinylidene fluoride-co-hexafluoropropylene) (PVdF-12wt%HFP) copolymer on a polyethylene separator. The effect of moisturized ZrO2 nanoparticles on the morphology and the microstructure of the polymeric coating layer is investigated. A large number of micropores formed around the embedded ZrO2 nanoparticles in the coating layer as a result of the phase inversion caused by the adsorbed moisture. The formation of micropores highly affects the ionic conductivity and electrolyte uptake of the ceramic composite separator and, by extension, the rate discharge properties of lithium ion batteries. In particular, thermal stability of the ceramic composite separators coated with the highly moisturized ZrO2 nanoparticles (a moisture content of 16 000 ppm) is dramatically improved without any degradation in electrochemical performance compared to the performance of pristine polyethylene separators.
我们介绍了一种陶瓷复合隔膜，它是通过在聚乙烯隔膜上用聚（偏二氟乙烯 - 共 - 六氟丙烯）（PVdF - 12wt%HFP）共聚物涂覆湿润的ZrO₂纳米颗粒制备而成。研究了湿润的ZrO₂纳米颗粒对聚合物涂层形态和微观结构的影响。由于吸附水分引起的相转变，在涂层中嵌入的ZrO₂纳米颗粒周围形成了大量微孔。微孔的形成极大地影响了陶瓷复合隔膜的离子电导率和电解质吸收率，进而影响锂离子电池的放电速率性能。特别是，与原始聚乙烯隔膜的性能相比，涂覆有高湿润ZrO₂纳米颗粒（水分含量为16000 ppm）的陶瓷复合隔膜的热稳定性得到了显著提高，且电化学性能没有任何下降。
