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Hydrated Eutectic Electrolytes with Ligand-Oriented Solvation Shells for Long-Cycling Zinc-Organic Batteries

2020; Elsevier BV; Volume: 4; Issue: 7 Linguagem: Inglês

10.1016/j.joule.2020.05.018

2542-4785

Wuhai Yang, Xiaofan Du, Jingwen Zhao, Zheng Chen, Jiajia Li, Jian Xie, Yaojian Zhang, Zili Cui, Qingyu Kong, Zhiming Zhao, Cunguo Wang, Qichun Zhang, Guanglei Cui,

Advancements in Battery Materials

Summary Despite their intrinsic safety and cost-effectiveness, aqueous zinc (Zn)-organic batteries have been struggling with the rapid performance degradation arising from the poor reversibility of Zn anodes and the dissolution of cathodes. Here, we present a new aqueous eutectic electrolyte by coupling a hydrated Zn salt (Zn(ClO 4 ) 2 ·6H 2 O) exclusively with a neutral ligand (succinonitrile) to mitigate these issues. The unique aqua Zn 2+ solvates with a succinonitrile-assisted solvation shell enable an unusual Zn/Zn 2+ reversibility of 98.4% Coulombic efficiency along with smooth Zn deposition. Moreover, all water molecules contribute to the formation of the eutectic network, resulting in a delayed oxidation and suppressed solvating ability. When a quinone-based polymer material (38 wt % sulfur content) is utilized as a cathode, the Zn-organic battery with this aqueous eutectic electrolyte exhibits an unprecedented cyclability with a low capacity decay rate (0.004% per cycle over 3,500 cycles) and superior low-temperature performance.