单分散SiO2纳米颗粒复合凝胶电解质的应用

以单分散程度较高的SiO₂纳米颗粒(约130 nm)作为填料,聚偏氟乙烯-六氟丙烯(PVDF?HFP)作为聚合物基质,采用简便的物理共混法制备出了一种单分散SiO₂纳米颗粒复合凝胶聚合物电解质(MCGPEs)并将其应用于锂电池中。扫描电镜结果表明,SiO₂纳米颗粒在聚合物基体中分散均匀。与传统凝胶聚合物电解质(GPEs)和商业SiO₂颗粒复合凝胶电解质(CGPEs)相比,MCGPEs有着更高的电解液吸液能力和离子电导率,并且具备更强的锂离子迁移能力。此外,使用MCGPEs作为电解质的锂电池,在1.0C下历经300次循环后仍然保持了121.1 mAh·g^-1的较高比容量,表现出了优异的循环性能。同时,其倍率性能也十分优异,在10C倍率下获得了135 mAh·g^-1的比容量,远高于GPEs锂电池(76.2 mAh·g^-1)。

Application of Monodisperse SiO2 Nanoparticles Composite Gel Electrolytes

In this work, the well-monodispersed SiO₂ nanoparticles (about 130 nm) were used as the filler while the polyvinylidene fluoride-hexafluoropropylene (PVDF-HFP) was used as the polymer matrix. The monodisperse SiO₂ composite gel polymer electrolytes (MCGPEs) were prepared by a simple method and applied to lithium batteries. SiO₂ has better dispersion and uniformity in the polymer matrix. Compared with the conventional composite gel polymer electrolytes (GPEs) and commercial SiO₂ composite gel polymer electrolytes (CGPEs), MCGPEs exhibited the more excellent ability of liquid absorption and better lithium-ion migration ability. Moreover, the cells which used MCGPEs as electrolytes maintained a high specific capacity of 121.1 mAh·g^-1 after 300 cycles at 1.0C, showing a satisfactory cycle performance. Meanwhile, the rate performance of MCGPEs was also excellent. The cells using MCGPEs owned the specific capacity of 135 mAh·g^-1 at 10C which was higher than GPEs cells (76.2 mAh·g^-1).