Manipulating Interfacial Stability Via Absorption-Competition Mechanism for Long-Lifespan Zn Anode

• 作者: Meijia Qiu Liang Ma Peng Sun Zilong Wang Guofeng Cui Wenjie Mai
• 来源期刊: 纳微快报（英文版）
• 年，卷（期）: 2022,（2）
• 页码范围: 161-173
• 页数: 13页
• 语种: 英文

摘要

The stability of Zn anode in various Zn-based energy storage devices is the key problem to be solved.Herein,aromatic aldehyde additives are selected to modulate the interface reactions between the Zn anode and electrolyte.Through comprehensively considering electro-chemical measurements,DFT calculations and FEA simula-tions,novel mechanisms of one kind of aromatic aldehyde,veratraldehyde in inhibiting Zn dendrite/by-products can be obtained.This additive prefers to absorb on the Zn sur-face than H2O molecules and Zn2+,while competes with hydrogen evolution reaction and Zn plating/stripping process via redox reactions,thus preventing the decomposition of active H2O near the interface and uncontrollable Zn dendrite growth via a synactic absorption-competition mechanism.As a result,Zn-Zn symmetric cells with the veratraldehyde additive realize an excellent cycling life of 3200 h under 1 mA cm-2/1 mAh cm-2 and over 800 h even under 5 mA cm-2/5 mAh cm-2.Moreover,Zn-Ti and Zn-MnO2 cells with the veratraldehyde additive both obtain elevated performance than that with pure ZnSO4 electrolyte.Finally,two more aromatic aldehyde additives are chosen to prove their universality in stabilizing Zn anodes.