期刊
ENERGY STORAGE MATERIALS
卷 43, 期 -, 页码 375-382出版社
ELSEVIER
DOI: 10.1016/j.ensm.2021.09.021
关键词
Zinc anode; Solid electrolyte interphase; Interface chemistry; Aqueous batteries; Energy storage
资金
- National Natural Science Foundation of China [22075067, 21805066, 22075016]
- Natural Science Foundation of Hebei Province [B202001001, B2019201160]
- Top Young Talents Project of Hebei Education Department [BJ2019052]
- Research Innovation Team of College of Chemistry and Environmental Science of Hebei University [hxkytd2102]
By pre-cycling Zn electrodes in an organic electrolyte, a stable organic-inorganic hybrid SEI layer can be formed on the Zn electrode, effectively reducing dendrite growth and water-induced side reactions in aqueous batteries, and improving the stability and lifespan of Zn electrodes.
Metallic zinc (Zn) anode holds great promise for aqueous batteries but suffers from the dendrite growth and water-induced side reactions due to the absence of a stable solid electrolyte interphase (SEI) layer. Herein, we propose an efficient strategy to in-situ build a robust organic-inorganic hybrid SEI on Zn electrode (denoted as SEI-Zn) by electrochemically pre-cycling Zn electrodes in an organic electrolyte consisting of zinc trifluoromethanesulfonate salt and triethyl phosphate solvent. The as-formed SEI features an organic-rich outer layer and an inorganic Zn-3(PO4)(2)-ZnF2-ZnS rich inner layer arising from the reductive decomposition of the organic electrolyte, which can isolate active Zn from the bulk electrolyte and allow a rapid and uniform Zn2+ diffusion. When the tailored SEI-Zn is applied into aqueous systems, the hydrogen evolution and Zn corrosion are significantly suppressed, whilst a dendrite-free Zn deposition with a preferred (002) orientation is characterized. The presence of SEI enables a prolonged lifespan of symmetric Zn//Zn cells over 2500 and 450 h at 1.0 and 10.0 mA cm(-2), respectively, significantly outperforming the bare Zn counterpart. Moreover, both coin- and pouch-type SEI-Zn//V2O5 center dot nH(2)O full batteries exhibit excellent cycling durability. This work will inspire the design of SEI on metal anodes for stable aqueous batteries.
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