Abstract：
Gel electrolytes have attracted extensive attention in flexible batteries. However, the traditional hydrogel electrolyte is not enough to solve the fundamental problems of zinc anodes, such as dendrite growth, side reactions, and freezing failure at temperatures below zero, which seriously restricts the development of zinc-ion batteries. As a flexible energy storage device, the zinc-ion battery inevitably undergoes multiple stretches, bends, folds, or twists in daily use. Here, a self-healing and stretchable eutectogel, designated as deep eutectic solvent-acrylamide eutectic gel (DA-ETG), was developed as a solid-state electrolyte for zinc-ion batteries. This gel was prepared by immobilizing a high-concentration ZnCl2 deep eutectic solvent (DES) into a polyacrylamide matrix through in situ polymerization under ultraviolet light. The eutectogel electrolyte showed exceptional mechanical properties with a maximum fracture strength of 0.6 MPa and a high ionic conductivity of 6.4 × 10-4 S cm-1. The in situ polymerization of the DA-ETG electrolyte in the assembly of a full solid-state zinc-ion battery increased the electrode-electrolyte interface area contact, reduced the ion transport distance between the electrode and electrolyte, minimized the internal resistance, and enhanced the battery\'s long-term cycling stability. Using the DA-ETG electrolyte, a remarkably high capacity of 580 mAh g-1 at 0.1 A g-1 was achieved by the zinc-ion battery, and a considerable capacity of 234 mAh g-1 was maintained even at 5 A g-1, showing exceptional rate performance. After 2000 cycles at 2 A g-1, the cell with the eutectogel retained a capacity of 85% with a cycling efficiency close to 98%, which demonstrated excellent cycling stability. The self-healing function enabled the prepared soft battery to be reused multiple times, with full contact between the electrode and electrolyte interface, and without device failures.
摘要：
凝胶电解质在柔性电池中受到广泛关注。然而,传统的水凝胶电解质不足以解决锌阳极的基本问题，如枝晶生长，副反应,在零度以下的温度下冻结失败，严重制约了锌离子电池的发展。作为一种灵活的储能装置，锌离子电池不可避免地经历了多次延伸，弯管,折叠,或扭曲在日常使用。这里,一个自我修复和可拉伸的共晶，指定为深共晶溶剂-丙烯酰胺共晶凝胶（DA-ETG），被开发为锌离子电池的固态电解质。该凝胶是通过在紫外光下通过原位聚合将高浓度ZnCl2深共晶溶剂（DES）固定到聚丙烯酰胺基质中来制备的。共晶电解质具有出色的机械性能，最大断裂强度为0.6MPa，高离子电导率为6.4×10-4Scm-1。在全固态锌离子电池的组装中，DA-ETG电解质的原位聚合增加了电极-电解质界面的接触面积，减少了电极和电解质之间的离子传输距离，最小化内阻，并增强了电池的长期循环稳定性。使用DA-ETG电解液,锌离子电池在0.1Ag-1时达到了580mAhg-1的显着高容量，并且即使在5Ag-1下也保持234mAhg-1的相当大的容量，显示出优异的倍率性能。在2Ag-1下进行2000次循环后，具有共析体的电池保持了85％的容量，循环效率接近98％，这证明了优异的循环稳定性。自我修复功能使准备好的软电池可以重复使用多次，电极和电解质界面之间完全接触，并且没有设备故障。
