A Self-Assembled Nanoporous Polyelectrolytic Interlayer for Highly Stable Zinc Metal Anodes
A Self-Assembled Nanoporous Polyelectrolytic Interlayer for Highly Stable Zinc Metal Anodes
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DOI：
10.1016/j.cej.2023.142276
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发表时间：
2023-03
影响因子：
15.1
通讯作者：
Siyu Tian;Long Zhou;W. He;Yafen Tian;Yue Zhou;Shiwen Wu;Ruda Jian;K. Balkus;Tengfei Luo-Tengfei
中科院分区：
文献类型：
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作者：
Siyu Tian;Long Zhou;W. He;Yafen Tian;Yue Zhou;Shiwen Wu;Ruda Jian;K. Balkus;Tengfei Luo-Tengfei
基于锌金属阳极的水溶液锌离子电池（AZIBs）由于其高性能、环境友好、低成本和高丰度而成为下一代能量存储的有希望的候选者。然而，锌金属阳极在水溶液中的过度枝晶生长和连续析氢严重恶化了AZIBs的电化学性能。在这里，一个高度稳定的锌金属阳极的设计，通过重建其表面与自组装纳米多孔聚电解质夹层。这种由聚丙烯酸-锌（PAAZn）纳米球组成的独特保护层具有高度亲水性，可以作为物理屏障，减少Zn金属与水分子之间的接触，从而抑制析氢和Zn腐蚀。同时，PAAZn中间层的独特纳米结构和化学组成确保了快速的Zn电镀/剥离动力学，并通过重新分配Zn/电解质界面处的Zn离子通量和局部电场来促进Zn沉积物的均匀生长。因此，基于PAAZn改性的Zn金属阳极（PAAZn@Zn）的对称电池表现出2,850小时的显著延长的循环寿命和低电压滞后。本工作报道了一种独特设计的用于高度可逆锌金属阳极的纳米多孔聚电解质中间层，并提供了一种新的策略来提高AZIBs的电化学性能。
Aqueous zinc-ion batteries (AZIBs) based on Zn metal anodes are promising candidates for next-generation energy storage due to their high performance, environmental friendliness, low cost, and high abundance. However, the excessive dendrite growth and continuous hydrogen evolution of Zn metal anodes in aqueous electrolytes severely deteriorate the electrochemical performance of AZIBs. Here, a highly stable Zn metal anode is designed by reconstructing its surface with a self-assembled nanoporous polyelectrolytic interlayer. This unique protective layer consisting of polyacrylic acid-zinc (PAAZn) nanospheres is highly hydrophilic and can act as a physical barrier to reduce the contact between Zn metal and water molecules, thus suppressing hydrogen evolution and Zn corrosion. Meanwhile, the unique nanostructures and chemical compositions of the PAAZn interlayer ensure fast Zn plating/stripping kinetics and facilitate the homogeneous growth of Zn deposits by redistributing Zn ion flux and local electric field at Zn/electrolyte interfaces. Therefore, symmetric cells based on the PAAZn-modified Zn metal anode (PAAZn@Zn) exhibited a significantly prolonged cycle life of 2,850 h and low voltage hysteresis. This work reports a uniquely designed nanoporous polyelectrolytic interlayer for highly reversible Zn metal anodes and provides a new strategy to enhance the electrochemical performance of AZIBs.