Yuxin Yuan, Jianping Chen, Tianyue Qian, Bowen Zhang, Ke Ye, Ruimin Li, Xiaowei Yang
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引用次数: 0
摘要
水溶液锌离子电池(azib)是一种很有前途的高安全性储能装置,但其实际应用受到枝晶生长和析氢反应(HER)的限制。固体电解质界面(SEI)有望解决这些问题。在这里,我们发现HER会导致松散和多孔的界面结构,这使得原位构建可靠的SEI成为一个挑战。因此,提出了一种普遍有效的氢原子清除策略,通过引入过硫酸钾(PSS)原位构建致密均匀的无机SEI。PSS清除吸附的氢原子,从而抑制HER。同时,PSS被还原成SO4 -,参与氢氧化锌硫酸盐(ZHS)的生成。在没有H2气泡干扰ZHS结晶的情况下,构建了理想的SEI结构。这种zs - sei表现出优异的电子绝缘,在循环过程中有效地抑制了HER和Zn枝晶的进一步生长。结果表明,PSS锌/锌对称电池在5ma cm-2和2.5 mAh cm-2下的镀锌时间为1882 h,在10ma cm-2和5mah cm-2下的镀锌时间为650 h。在5 A g-1下,Zn||NVO全电池的循环稳定性也得到了显著提高。这项工作为锌阳极界面的稳定提供了一个新的视角。
Hydrogen Atom Capture Toward Dense Solid Electrolyte Interface for Long-Cycling Aqueous Zinc-Ion Batteries.
Aqueous zinc-ion batteries (AZIBs) are promising high-safety energy storage devices, but their practical implementation has been limited by dendrite growth and hydrogen evolution reaction (HER). Solid-electrolyte interface (SEI) is expected to address these problems. Herein, we revealed that HER results in loose and porous interfacial structure, making the in situ construction of reliable SEI a challenge. Thus, a universal and effective hydrogen atom scavenging strategy is proposed to in situ construct a dense and uniform inorganic SEI by introducing potassium persulfate (PSS). PSS scavenges the adsorbed hydrogen atoms, thus inhibiting HER. Meanwhile, PSS is reduced into SO42- and participates in the formation of zinc hydroxide sulfates (ZHS). With no interference of H2 bubbles on ZHS crystallization, an ideal SEI is constructed. This ZHS-SEI exhibits superior electronic insulation, effectively suppressing further HER and Zn dendrite growth during cycling. As a result, the Zn//Zn symmetric cell with PSS can achieve stable Zn plating/stripping for 1882 h at 5 mA cm-2 and 2.5 mAh cm-2 and 650 h at 10 mA cm-2 and 5 mAh cm-2, respectively. The cycling stability of the Zn||NVO full cell is also significantly improved at 5 A g-1. This work provides a novel perspective for stabilizing the zinc anode interface.