Stabilizing Zn metal anodes by 4-hydroxybenzaldehyde as the H* scavenger

被引：17

作者：

Huang, Cong ^{[1
]}

Zhao, Xin ^{[1
]}

Hao, Yisu ^{[1
]}

Yang, Yujie ^{[1
]}

Qian, Yang ^{[1
]}

Chang, Ge ^{[1
]}

Zhang, Yan ^{[1
]}

Tang, Qunli ^{[1
]}

Hu, Aiping ^{[1
]}

Chen, Xiaohua ^{[1
]}

机构：

[1] Hunan Univ, Coll Mat Sci & Engn, Hunan Prov Key Lab Adv Carbon Mat & Appl Technol, Changsha 410082, Peoples R China

来源：

ENERGY STORAGE MATERIALS | 2024年 / 65卷

基金：

中国国家自然科学基金;

关键词：

Zinc anodes; Dendrites; Electrolyte additives; Reversibility; Corrosion reactions; ION BATTERIES; LONG-LIFE; ADDITIVES;

D O I：

10.1016/j.ensm.2023.103158

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The conventional wisdom of Zn metal anodes suggests avoiding the hydrogen evolution reactions (HER) in aqueous electrolytes since it leads to H2 production, irregular by-product precipitation, and then the quick failure of batteries. However, the HER process is thermodynamically inevitable during cycling, especially when water is the main solvent. Herein, we propose a novel H* scavenger strategy to properly utilize the HER process instead of blocking it. By coupling experimental and theoretical analysis, we reveal the positive role of 4-hydroxybenzaldehyde (HB) additives, which consume the H* produced by the Volmer step and thus suppress the Heyrovsky or Tafel step of HER. The former produces a uniform organic/inorganic solid electrolyte interphase (SEI), while the latter eliminates H2 gas production. As a consequence, HB additives enable a stable cycle life of 120 h at 30 mA cm-2 with a depth of discharge (DOD) of 51.3 % in Zn|Zn symmetric cells and an average Coulombic efficiency of 99.8 % at 2 mA cm-2 for 2460 cycles in Zn|Cu half cells. The versatility of this H* scavenger strategy is also demonstrated by extending it to other zinc salts and electrolyte additives.

引用

页数：10

共 85 条

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