A new nanocomposite polymer electrolyte based on poly(vinyl alcohol) incorporating hypergrafted nano-silica
作者:Xian-Lei Hu、Gao-Ming Hou、Ming-Qiu Zhang、Min-Zhi Rong、Wen-Hong Ruan、Emmanuel P. Giannelis
DOI:10.1039/c2jm33156j
日期:——
Solid-state nanocomposite polymer electrolytes based on poly(vinyl alcohol)(PVA) incorporating hyperbranched poly(amine-ester) (HBPAE) grafted nano-silica (denoted as SiO2-g-HBPAE) have been prepared and investigated. Through surface pretreatment of nanoparticles, followed by Michael-addition and a self-condensation process, hyperbranched poly(amine-ester) was directly polymerized from the surface of nano-silica. Then the hypergrafted nanoparticles were added to PVA matrix, and blended with lithium perchlorate via mold casting method to fabricate nanocomposite polymer electrolytes. By introducing hypergrafted nanoparticles, ionic conductivity of solid composite is improved significantly at the testing temperature. Hypergrafted nano-silica may act as solid plasticizer, promoting lithium salt dissociation in the matrix as well as improving segmental motion of matrix. In addition, tensile testing shows that such materials are soft and tough even at room temperature. From the dielectric spectra of nanocomposite polymer electrolyte as the function of temperature, it can be deduced that Arrhenius behavior appears depending on the content of hypergrafted nano-silica and concentration of lithium perchlorate. At a loading of 15 wt% hypergrafted nano-silica and 54 wt% lithium perchlorate, promising ionic conductivities of PVA nanocomposite polymer electrolyte are achieved, about 1.51 × 10−4 S cm−1 at 25 °C and 1.36 × 10−3 S cm−1 at 100 °C.
制备并研究了基于聚(乙烯醇)(PVA)掺入超支化聚(胺酯)(HBPAE)接枝纳米二氧化硅(表示为SiO2-g-HBPAE)的固态纳米复合聚合物电解质。通过纳米粒子的表面预处理,然后进行迈克尔加成和自缩合过程,超支化聚胺酯直接从纳米二氧化硅表面聚合而成。然后将超接枝纳米颗粒添加到PVA基体中,通过铸模法与高氯酸锂共混,制备纳米复合聚合物电解质。通过引入超接枝纳米颗粒,固体复合材料的离子电导率在测试温度下显着提高。超接枝纳米二氧化硅可以作为固体增塑剂,促进基体中锂盐的解离,并改善基体的链段运动。此外,拉伸测试表明,此类材料即使在室温下也柔软且坚韧。从纳米复合聚合物电解质的介电谱随温度的变化,可以推断出阿伦尼乌斯行为的出现取决于超接枝纳米二氧化硅的含量和高氯酸锂的浓度。在负载 15 wt% 超接枝纳米二氧化硅和 54 wt% 高氯酸锂时,PVA 纳米复合聚合物电解质实现了有希望的离子电导率,在 25 °C 和 1.36 × 10−3 S 下约为 1.51 × 10−4 S cm−1 100°C 时 cm−1。