Shin Won-Kyung, Lee Yoon-Sung, Kim Dong-Won
Department of Chemical Engineering, Hanyang University, Seoul 133-791, Korea.
J Nanosci Nanotechnol. 2013 May;13(5):3705-10. doi: 10.1166/jnn.2013.7254.
A hybrid composite membrane is prepared by coating nano-sized Al2O3 powder (13 and 50 nm) and poly(vinylidene fluoride-co-hexafluoropropene) (P(VdF-co-HFP)) binder on both sides of polyethylene separator. The composite membrane shows better thermal stability and improved wettability for organic liquid electrolyte than polyethylene separator, due to the presence of heat-resistant Al2O3 particles with high-surface area in the coating layer. By using the composite membrane, the lithium-ion cells composed of carbon anode and LiNi1/3Co1/3Mn1/3O2 cathode are assembled and their cycling performances are evaluated. The cells assembled with the composite membranes are proven to have better capacity retention than the cell prepared with polyethylene separator, due to the enhanced ability to retain the electrolyte solution in the cell. The cell assembled with the composite membrane containing 13 nm-sized Al2O3 particles has an initial discharge capacity of 173.2 mA h g(-1) with good capacity retention.
通过在聚乙烯隔膜两侧涂覆纳米尺寸的Al2O3粉末（13和50纳米）以及聚（偏二氟乙烯 - 共 - 六氟丙烯）（P（VdF - 共 - HFP））粘合剂，制备了一种混合复合膜。由于涂层中存在具有高表面积的耐热Al2O3颗粒，该复合膜比聚乙烯隔膜表现出更好的热稳定性和对有机液体电解质的润湿性。使用该复合膜组装了由碳阳极和LiNi1/3Co1/3Mn1/3O2阴极组成的锂离子电池，并评估了它们的循环性能。由于增强了在电池中保留电解质溶液的能力，证明用复合膜组装的电池比用聚乙烯隔膜制备的电池具有更好的容量保持率。用含有13纳米尺寸Al2O3颗粒的复合膜组装的电池具有173.2 mA h g(-1)的初始放电容量和良好的容量保持率。
