Sustainable high-energy aqueous zinc-manganese dioxide batteries enabled by stress-governed metal electrodeposition and fast zinc diffusivity
Sustainable high-energy aqueous zinc-manganese dioxide batteries enabled by stress-governed metal electrodeposition and fast zinc diffusivity
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通过应力控制金属电沉积和快速锌扩散率实现可持续高能水性锌二氧化锰电池
DOI：
10.1039/d2ee03777g
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发表时间：
2023
期刊：
影响因子：
--
通讯作者：
Zhou Haoshen
中科院分区：
文献类型：
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作者：
Yang Huijun;Zhu Ruijie;Yang Yang;Lu Ziyang;Chang Zhi;He Ping;Zhu Chunyu;Kitano Sho;Aoki Yoshitaka;Habazaki Hiroki;Zhou Haoshen
锌基储能系统的重新评估满足了安全性和成本效益方面的新需求。然而，枝晶状Zn形态和由此产生的电池内短路仍然是长期存在的挑战。此外，不同的Zn枝晶传播加剧了这种情况，特别是在高容量电池操作期间。高容量Zn沉积/溶解过程涉及许多位点和界面，由于固有的扩散限制聚集机制，这导致无序的Zn枝晶生长。在这里，我们展示了一个强大的聚合物隔板，作为一个物理屏障，以应力支配的金属电沉积和离子电荷载体快速Zn 2+扩散。这些见解实现了在20.0 mA cm−2和4.0 mA h cm−2下2000次循环的超高Zn可逆性（99.97%），以及具有积极的N/P容量比（1.35）的高能量密度（基于袋式电池为115 W h kg−1）Zn-MnO 2全电池。丰富且环保的电池组件使其成为全球电气化的可持续电池技术。
The re-evaluation of zinc (Zn)-based energy storage systems satisfies emerging demands in terms of safety and cost-effectiveness. However, the dendritic Zn morphology and resulting short circuits within the cell remain long-standing challenges. Moreover, diverse Zn dendrite propagation exacerbates the situation, particularly during high-capacity battery operation. The high-capacity Zn deposition/dissolution process involves numerous sites and interfaces, which leads to disordered Zn dendrite growth because of the inherent diffusion-limited aggregation mechanism. Here, we demonstrate a robust polymer separator that serves as both a physical barrier to stress-governed metal electrodeposition and an ionic charge carrier for fast Zn2+ diffusivity. These insights enable an ultra-high Zn reversibility (99.97%) for 2000 cycles at 20.0 mA cm−2 and 4.0 mA h cm−2, and a high-energy-density (115 W h kg−1 based on pouch cell) Zn–MnO2 full battery with an aggressive N/P capacity ratio (1.35). The abundant and environmentally friendly cell components make it a sustainable battery technology for global electrification.