Ying Hangjun, Huang Pengfei, Zhang Zhao, Zhang Shunlong, Han Qizhen, Zhang Zhihao, Wang Jianli, Han Wei-Qiang
School of Materials Science and Engineering, Zhejiang University, Hangzhou, 310027, People's Republic of China.
Nanomicro Lett. 2022 Sep 1;14(1):180. doi: 10.1007/s40820-022-00921-6.
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 Zn 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. The feasibility of the MCFs interfacial layer is also convinced in Zn@MCFs||MnO batteries. Remarkably, the Zn@MCFs||α-MnO batteries deliver a high specific capacity of 236.1 mAh g at 1 A g with excellent stability, and maintain an exhilarating energy density of 154.3 Wh kg at 33% depth of discharge in pouch batteries.
水系可充电锌离子电池因其具有高安全性、高能量密度、低成本和环境友好等显著优势，被视为锂离子电池的一种有竞争力的替代品。然而，包括锌枝晶和不良副反应在内的深层次问题严重阻碍了其实际应用。在这项工作中，我们提出了一种由多壳层碳纤维（MCFs）组成的独立式锌-电解质界面层，以调节锌负极的电镀/剥离行为。多功能的MCFs保护层可以使电场和锌通量均匀化，同时降低沉积过电位，从而实现高质量和快速的锌沉积动力学。此外，锌在Zn-MCFs界面上的自下而上且均匀的沉积赋予了长期和高容量的电镀性能。因此，Zn@MCFs对称电池在5 mAh cm的条件下可以持续工作长达1500小时。MCFs界面层在Zn@MCFs||MnO电池中的可行性也得到了证实。值得注意的是，Zn@MCFs||α-MnO电池在1 A g的电流密度下具有236.1 mAh g的高比容量和出色的稳定性，并且在软包电池中33%的放电深度下保持令人振奋的154.3 Wh kg的能量密度。
