The continuous development of flexible electronics has driven researchers to intensively study zinc–air batteries with a theoretical high energy density, low cost, and high safety. However, conventional zinc–air batteries suffer from safety problems, such as electrolyte leakage. Therefore, the development of a green, renewable, and biodegradable solid electrolyte is urgently needed. In this work, a polymer electrolyte based on soybean protein isolate with high hydrophilicity, biodegradability, and ionic conductivity up to 0.024 S cm^–1 is designed and applied to zinc–air batteries. The activation energy is obtained by calculating the slope of ln(σ) versus (1000/T) according to the Arrhenius equation, and OH^– transport is mainly controlled by the Grotthuss mechanism. The resulting solid-state zinc–air battery has a stable discharge plateau of 1.2 V at 10 mA cm^–2, a peak power density of up to 80 mW cm^–2, and a long cycle stability of around 4300 min. This study provides a new option for designing green, economical, and biodegradable solid electrolyte and flexible sustainable energy storage devices from biomass.

中文翻译：

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面向绿色柔性锌空气电池的可生物降解电解质


柔性电子学的不断发展促使研究人员深入研究理论上能量密度高、成本低、安全性高的锌-空气电池。然而，传统的锌空气电池存在安全问题，例如电解液泄漏。因此，迫切需要开发一种绿色、可再生和可生物降解的固体电解质。在这项工作中，设计了一种基于大豆分离蛋白的聚合物电解质，具有高亲水性、生物降解性和高达 0.024 S ^cm–1 的离子电导率，并将其应用于锌空气电池。活化能是通过根据 Arrhenius 方程计算 ln（σ） 与 （1000/T） 的斜率获得的，OH^– 传输主要由格罗图斯机制控制。所得的固态锌空气电池在 10 mA cm^–2 时具有 1.2 V 的稳定放电平台，峰值功率密度高达 80 mW cm^–2，以及约 4300 分钟的长循环稳定性。本研究为利用生物质设计绿色、经济、可生物降解的固体电解质和柔性可持续储能装置提供了新的选择。