Aqueous rechargeable zinc ion batteries are regarded as a competitive alternative to lithium-ion batteries because of their distinct advantages of high security, high energy density, low cost, and environmental friendliness. However, deep-seated problems including Zn dendrite and adverse side reactions severely impede the practical application. In this work, we proposed a freestanding Zn-electrolyte interfacial layer composed of multicapsular carbon fibers (MCFs) to regulate the plating/stripping behavior of Zn anodes. The versatile MCFs protective layer can uniformize the electric field and Zn²⁺ flux, meanwhile, reduce the deposition overpotentials, leading to high-quality and rapid Zn deposition kinetics. Furthermore, the bottom-up and uniform deposition of Zn on the Zn-MCFs interface endows long-term and high-capacity plating. Accordingly, the Zn@MCFs symmetric batteries can keep working up to 1500 h with 5 mAh cm⁻². The feasibility of the MCFs interfacial layer is also convinced in Zn@MCFs||MnO₂ batteries. Remarkably, the Zn@MCFs||α-MnO₂ batteries deliver a high specific capacity of 236.1 mAh g⁻¹ at 1 A g⁻¹ with excellent stability, and maintain an exhilarating energy density of 154.3 Wh kg⁻¹ at 33% depth of discharge in pouch batteries.

水系可充电锌离子电池由于具有高安全性、高能量密度、低成本和环境友好等明显优势，被认为是锂离子电池的有竞争力的替代品。然而，Zn枝晶和不良副反应等深层次问题严重阻碍了实际应用。在这项工作中，我们提出了一种由多囊碳纤维 (MCF) 组成的独立式锌电解质界面层，以调节锌阳极的电镀/剥离行为。多功能MCFs保护层可以均匀电场和Zn ²⁺同时，通量降低了沉积过电势，导致高质量和快速的锌沉积动力学。此外，Zn 在 Zn-MCFs 界面上自下而上且均匀的沉积赋予了长期和高容量的电镀。^{因此，Zn@MCFs 对称电池可以在 5 mAh cm -2}下保持工作长达 1500 小时。MCFs 界面层的可行性在 Zn@MCFs||MnO ₂电池中也得到了证实。值得注意的是，Zn@MCFs||α-MnO ₂电池在 1 A g ⁻¹下具有236.1 mAh g ⁻¹的高比容量和出色的稳定性，并在 33% 深度保持令人振奋的 154.3 Wh kg ⁻¹能量密度软包电池中的放电。