期刊
CHEMICAL ENGINEERING JOURNAL
卷 450, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2022.138265
关键词
Solvation structure; Interface self-adaptive layer; Synchronous regulation; Acetonitrile-water co-solvent; Zinc-ion batteries
资金
- National Natural Science Foundational China [51872162, 11890700]
- Universities Twenty Foundational Items of Jinan City [2021GXRC039]
- Key R & D Innovation Program of Shandong Province -Major Innovation Project [2019TSLH0116]
This study demonstrates a new strategy of tuning the electrolyte solvation structure and electrode interface to achieve highly reversible zinc plating/stripping. The introduction of acetonitrile as a co-solvent attenuates the solvation of Zn2+ and water activity, leading to an adaptive zinc-electrolyte interface. This electrolyte engineering significantly prevents undesired reactions and improves the cycling stability and rate performance of zinc-ion batteries in various systems.
Uncontrollable dendrite growth and parasitic reactions are the fundamental obstacles to achieve large-scale application of aqueous Zn-ion batteries. Herein, a new strategy of tuning the electrolyte solvation structure and electrode interface is demonstrated for highly reversible zinc plating/stripping. Acetonitrile (AN) is intro-duced into Zn(OTf)2 electrolyte as co-solvent, the interaction between Zn2+ and acetonitrile attenuates the Zn2+ solvation and water activity. Concomitantly, theoretical calculations demonstrate that acetonitrile molecules tend to adsorb on the surface of zinc electrode to form an adaptive zinc-electrolyte interface. Such an electrolyte engineering significantly prevents water hydrogen evolution, suppresses vanadium dissolution and modulates Zn deposition behavior. As proof of concept, Zn//Zn symmetric cells with acetonitrile additive exhibit a ultra-long cycling of 2100 h at a high current density of 5 mA cm-2. In particular, the university of the acetonitrile-water co-solvent (AWCS) electrolyte is demonstrated, multiple battery systems (Zn//Al-V-O, Zn//Zn-V-O, Zn//VOOH, and Zn//Mn-V-O) deliver markedly improved cycling stability and rate performance. The mechanism of action of AWCS electrolyte on performance indicators is discussed in detail, which provides a promising insight for energy storage devices.
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