A Hydrogel Electrolyte with High Adaptability over a Wide Temperature Range and Mechanical Stress for Long‐Life Flexible Zinc‐Ion Batteries

• DOI: 10.1002/smll.202312116
• Publication Date: 2024-03-06T15:18:44Z
• Authors: Jingran Zhang; Chuyuan Lin; Lingxing Zeng; Hui Lin; Lingjun He; Fuyu Xiao; Luteng Luo; Peixun Xiong; Xuhui Yang; Qinghua Chen; Qingrong Qian
• Keywords: 01 natural sciences; 0104 chemical sciences

Abstract Flexible zinc‐ion batteries have garnered significant attention in the realm of wearable technology. However, instability hydrogel electrolytes a wide‐temperature range and uncontrollable side reactions Zn electrode become main problems for practical applications. Herein, N,N‐dimethylformamide (DMF) to design binary solvent (H 2 O‐DMF) is introduced combined it with polyacrylamide (PAM) ZnSO 4 synthesize electrolyte (denoted as PZD). The synergistic effect DMF PAM not only guides 2+ deposition on Zn(002) crystal plane isolates H O from anode, but also breaks hydrogen bonding network between water improve stability electrolytes. Consequently, symmetric cell utilizing PZD can stably cycle over 5600 h at 0.5 mA cm − @0.5 mAh −2 . Furthermore, Zn//PZD//MnO full exhibits favorable adaptability (for 16000 cycles 3 A g −1 under 25 °C, 750 98 0.1 ‐20 °C) outstanding mechanical properties lighting up LEDs conditions pressure, bending, cutting, puncture). This work proposes useful modification designing high‐performance electrolyte, which provides reference investigating flexible aqueous batteries.