Division of Energy Storage, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, 457 Zhongshan Road, Dalian, 116023, P. R. China.
University of Chinese Academy of Sciences, Beijing, 100049, P. R. China.
Nat Commun. 2018 Sep 13;9(1):3731. doi: 10.1038/s41467-018-06209-x.
Alkaline zinc-based flow batteries are regarded to be among the best choices for electric energy storage. Nevertheless, application is challenged by the issue of zinc dendrite/accumulation. Here, we report a negatively charged nanoporous membrane for a dendrite-free alkaline zinc-based flow battery with long cycle life. Free of zinc dendrite/accumulation, stable performance is afforded for ∼240 cycles at current densities ranging from 80 to 160 mA cm using the negatively charged nanoporous membrane. Furthermore, 8 h and 7 h plating/stripping processes at 40 mA cm yield an average energy efficiency of 91.92% and an areal discharge capacity above 130 mAh cm. A peak power density of 1056 mW cm is achieved at 1040 mA cm. This study may provide an effective way to address the issue of zinc dendrite/accumulation for zinc-based batteries and accelerate the advancement of these batteries.
碱性锌基流电池被认为是电能存储的最佳选择之一。然而，锌枝晶/积累问题对其应用提出了挑战。在这里，我们报告了一种带负电荷的纳米多孔膜，用于无枝晶碱性锌基流电池，具有长循环寿命。在使用带负电荷的纳米多孔膜时，在 80 至 160 mA cm 的电流密度范围内，可实现约 240 个循环的无锌枝晶/积累、稳定的性能。此外，在 40 mA cm 下进行 8 h 和 7 h 的电镀/剥离过程，平均能量效率为 91.92%，面放电容量超过 130 mAh cm。在 1040 mA cm 时达到 1056 mW cm 的峰值功率密度。本研究可能为解决锌基电池的锌枝晶/积累问题提供一种有效途径，并加速这些电池的发展。
