Polyether, especially, poly (ethylene oxide) has attracted extensive attention in polymer electrolytes since 1973 due to the superior coordination ability with alkali metal ions. However, the ionic conductivity of linear polyether is suppressed by the inherent effortless crystallizability. Here we synthesized hyperbranched polyether for composite polymer electrolytes (named as PMH9-1/1-3 NaTFSI) with an ionic conductivity of 5.7×10^-4 S cm^-1 at room temperature used in all-solid-state sodium ion batteries (ASIBs). The effect of grafting site on segmental motion and the plasticizing effect of TFSI^- anion on polyether are revealed by nuclear magnetic resonance and infrared spectrum characterizations. ASIBs using PMH9-1/1-3 NaTFSI exhibit a high capacity retention ratio of 92% at 0.2 C after 300 cycles. Studies on the grafting site on polyether backbone and the plasticizing effect of TFSI^- anion make sense to fabricating composite electrolytes with high performance for ASIBs.

自1973年以来，聚醚（尤其是聚环氧乙烷）由于与碱金属离子的优异配位能力而在聚合物电解质中引起了广泛关注。然而，线性聚醚的离子电导率被固有的轻松结晶性所抑制。在这里，我们合成了用于全固态钠离子电池（ASIBs）的室温下离子电导率为5.7×10 ^-4 S cm ^-1的复合聚合物电解质的超支化聚醚（命名为PMH9-1 / 1-3 NaTFSI）。）。在节段性运动和TFSI的增塑效果嫁接部位的效果^-核磁共振和红外光谱表征揭示了聚醚上的阴离子。使用PMH9-1 / 1-3 NaTFSI的ASIB在300次循环后在0.2 C时表现出92％的高容量保持率。研究聚醚骨架的嫁接部位和TFSI的塑化效果上^-阴离子意义的与ASIBs高性能复合材料制造电解质。