Multi-functional additive to enhance cycling performance of Zn anode in aqueous battery

• Published in: Journal of power sources 2024-03, Vol.595, p.234075, Article 234075
• Main Authors: Zeng, Wenping, Wang, Xudong, Huang, Yun, Zhang, Yunhe, Zheng, He, Xiao, Jie, Fu, Lei, Wang, Xichang, Li, Xing, Wang, Mingshan, Guo, Bingshu, Lin, Yuanhua
• Format: Article
• Language: English
• Subjects: Aqueous zinc ion batteries; Electrolyte additive; Sodium lactobionate; Solvated structure; Zinc anode
• ISSN: 0378-7753; 1873-2755
• DOI: 10.1016/j.jpowsour.2024.234075

The growth of dendritic dendrites and side reactions at the zinc anode result in poor cycling stability of the aqueous zinc-ion battery (AZIBs). Here, we report on a multifunctional additive, Sodium lactobionate (SL), that achieves more stable cycling performance. SL molecule can loosen the solvation structure of water and Zn2+, inhibit corrosion and hydrogen evolution reactions, and regulate ion deposition in AZIBs. Under the action of SL, the Zn//Zn symmetric battery achieves an ultra-long stable cycle of up to 2150 h at a current density of 2 mA·cm−2 and an area capacity of 1 mAh cm−2 and Zn//NVO can still perform 1110 cycles at the current density of 2 A g−1 and maintain the reversible specific discharge capacity of 179 mAh g−1. In addition, at 2 mA cm−2 and 0.5 mAh cm−2, the Zn//Cu asymmetric battery achieved up to 350 cycles with a coulomb efficiency of 99.5 %. •Sodium lactobionate can change the solvation structure of water and Zn2+.•Inhibit corrosion and regulate ion deposition.•Zn.||Zn symmetric cell exhibits a cycling of 2150 h at 2 mA cm−2, 1 mAh cm−2.•4.Zn.||NVO full cell shows 76.4 % retention after 1100 cycles at 2 A g−1.