Zinc-air batteries with high theoretical energy density have gained tremendous research interest as one of the candidate energy storage devices for flexible and portable electronic devices. Improving the performance of solid-state batteries (such as work stability, service life, etc.) has become a significant problem at present, and the choice of the ideal flexible solid electrolyte material as a “bridge” plays a vital role in flexible batteries. In this work, a polyvinyl alcohol (PVA)-based cellulose composite hydrogel electrolyte (HGE) was synthesized by carboxyl modified nanocellulose (C-CNFs), and the optimum adding amount of C-CNFs was screened. The PVA-based cellulose composite HGE had excellent environmental stability and high ion migration efficiency. After standing and full exposure for 48 h at room temperature, the mass loss was only 21.4%, and the initial ion conductivity reaches 3.12 × 10⁻¹S·cm⁻¹. In addition, the composite HGE had a specific improvement in thermal stability and tensile mechanical properties. The assembled flexible zinc-air battery (F-ZAB) showed excellent cycle life and discharge capacity. What's more, the F-ZAB can work continuously and stably at a bending angle of 180° with high flexibility and safety.

具有高理论能量密度的锌空气电池作为柔性和便携式电子设备的候选储能器件之一，引起了极大的研究兴趣。提高固态电池的性能（如工作稳定性、使用寿命等）已成为当前的一个重大问题，而选择理想的柔性固体电解质材料作为“桥梁”在柔性电池中起着至关重要的作用. 本工作以羧基改性纳米纤维素（C-CNFs）为原料合成了聚乙烯醇（PVA）基纤维素复合水凝胶电解质（HGE），并筛选出C-CNFs的最佳添加量。PVA 基纤维素复合 HGE 具有优异的环境稳定性和高离子迁移效率。在室温下静置并充分暴露 48 小时后，质量损失仅为 21。^-1 S·cm ^-1。此外，复合 HGE 在热稳定性和拉伸机械性能方面有特定的改进。组装的柔性锌空气电池（F-ZAB）显示出优异的循环寿命和放电容量。更重要的是，F-ZAB 可以在 180° 的弯曲角度下连续稳定地工作，具有很高的灵活性和安全性。