Nengbin Cai , Hongming Chen , Busheng Zhang , Zijing Liu , Xinbo He , Dan Zhou
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引用次数: 0
摘要
树枝状突变和寄生副反应导致的锌界面不稳定一直阻碍着锌金属水电池(AZMB)的实际应用。在此,我们在水电解质中引入了高分子极性的酪氨酸(Tyr)来调节锌阳极的界面电化学。在 AZMBs 中,Tyr 带正电荷的一面可以很好地吸附在 Zn 阳极表面形成贫水层,而暴露在外的羧酸盐一面则很容易与 Zn2+ 配位,有利于诱导 Zn2+ 的均匀电镀,并抑制水引起的副反应的发生。这反过来又使得锌阳极具有高度稳定性。因此,该锌阳极具有出色的循环稳定性(在 2 mA cm-2, 2 mA h cm-2 条件下 3000 小时,在 5 mA cm-2, 5 mA h cm-2 条件下 1300 小时)、高平均库仑效率(3200 个循环中达到 99.4%)和高放电深度(500 小时达到 80%)。此外,组装后的 Zn||NaV3O8-1.5H2O 全电池具有显著的容量保持率和超长寿命(在 5 A g-1 条件下,6650 次循环的寿命为 61.8%),以及更强的速率能力(在 5 A g-1 条件下,169 mA h g-1)。这项工作可促进设计和深入理解用于高性能 AZMB 的高分子极性电解质添加剂。
Toward long-life Zn anode using highly polar electrolyte additives
Unstable Zn interface caused by rampant dendrite growth and parasitic side reactions always hinders the practical application of aqueous zinc metal batteries (AZMBs). Herein, tyrosine (Tyr) with high molecular polarity was introduced into aqueous electrolyte to modulate the interfacial electrochemistry of Zn anode. In AZMBs, the positively charged side of Tyr can be well adsorbed on the surface of Zn anode to form a water-poor layer, and the exposed carboxylate side can be easily coordinated with Zn2+, favoring inducing uniform plating of Zn2+ and inhibiting the occurrence of water-induced side reactions. These in turn enable the achievement of highly stable Zn anode. Accordingly, the Zn anodes achieve outstanding cyclic stability (3000 h at 2 mA cm−2, 2 mA h cm−2 and 1300 h at 5 mA cm−2, 5 mA h cm−2), high average Coulombic efficiency (99.4% over 3200 cycles), and high depth of discharge (80% for 500 h). Besides, the assembled Zn||NaV3O8·1.5H2O full cells deliver remarkable capacity retention and ultra-long lifetime (61.8% over 6650 cycles at 5 A g−1) and enhanced rate capability (169 mA h g−1 at 5 A g−1). The work may promote the design and deep understanding of electrolyte additives with high molecular polarity for high-performance AZMBs.
期刊介绍:
The Journal of Energy Chemistry, the official publication of Science Press and the Dalian Institute of Chemical Physics, Chinese Academy of Sciences, serves as a platform for reporting creative research and innovative applications in energy chemistry. It mainly reports on creative researches and innovative applications of chemical conversions of fossil energy, carbon dioxide, electrochemical energy and hydrogen energy, as well as the conversions of biomass and solar energy related with chemical issues to promote academic exchanges in the field of energy chemistry and to accelerate the exploration, research and development of energy science and technologies.
This journal focuses on original research papers covering various topics within energy chemistry worldwide, including:
Optimized utilization of fossil energy
Hydrogen energy
Conversion and storage of electrochemical energy
Capture, storage, and chemical conversion of carbon dioxide
Materials and nanotechnologies for energy conversion and storage
Chemistry in biomass conversion
Chemistry in the utilization of solar energy