Weak Solvation Effect Induced Optimal Interfacial Chemistry Enables Highly Durable Zn Anodes for Aqueous Zn-Ion Batteries

被引:75
作者
Cao, Xianshuo [1 ,3 ]
Xu, Wei [2 ]
Zheng, Dezhou [2 ]
Wang, Fuxin [2 ]
Wang, Yi [1 ]
Shi, Xin [3 ]
Lu, Xihong [3 ]
机构
[1] Guiyang Univ, Coll Chem & Mat Engn, Guiyang 550005, Peoples R China
[2] Wuyi Univ, Sch Appl Phys & Mat, Jiangmen 529020, Peoples R China
[3] Sun Yat Sen Univ, Sch Chem, Key Lab Low Carbon Chem & Energy Conservat Guangdo, MOE Key Lab Bioinorgan & Synthet Chem, Guangzhou 510275, Peoples R China
基金
中国国家自然科学基金;
关键词
Aqueous Zn-Ion Batteries; Solid Electrolyte Interface; Solvation Structure; Weak Solvation Effect; Zn Anode;
D O I
10.1002/anie.202317302
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
Aqueous zinc-ion batteries (AZIBs) are emerging as one of the most reliable energy storage technologies for scale-up applications, but still suffer from the instability of Zn anode, which is mainly caused by the undesirable dendrite growth and side reactions. To tackle these issues, we formulate a new aqueous electrolyte with weak solvation effect by introducing low-dielectric-constant acetone to achieve H2O-poor solvation structure of Zn2+. Experimental and theoretical calculation studies concurrently reveal that such solvation structure can: i) relieve the solvated H2O related side reactions, ii) suppress the dendrite growth by boosting the desolvation kinetics of Zn2+ and iii) in situ form solid electrolyte interface (SEI) to synergistically inhibit the side reaction and dendrite growth. The synergy of these three factors prolongs the cycling life of Cu/Zn asymmetric cell from 30 h to more than 800 h at 1 mA cm-2/1 mAh cm-2, and can work at more harsh condition of 5 mA cm-2/5 mAh cm-2. More encouragingly, Zn/V2O5 & sdot; nH2O full cell also shows enhanced cycling stability of 95.9 % capacity retention after 1000 cycles, much better than that with baseline electrolyte (failing at approximate to 700th cycle). An electrolyte with weakly solvation effect is rationally developed for aqueous Zn ion batteries (AZIBs). Benefiting from the reduced solvated H2O, boosted desolvation kinetics and in situ formed solid electrolyte interface (SEI) layer, Zn anode cycled in this electrolyte can deliver enhanced cycling stability.image
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页数:8
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