Journal
ADVANCED FUNCTIONAL MATERIALS
Volume 31, Issue 46, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.202104361
Keywords
anti-corrosion; aqueous zinc batteries; dielectric behavior; zinc electrodeposition; zinc metal anodes
Categories
Funding
- National Natural Science Foundation of China [52002270]
- China Postdoctoral Science Foundation [2020M670661]
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The study introduces an elastic and anti-corrosive interlayer (PSN-Zn) to address dendrite formation and complex side reactions of Zn metal anodes in aqueous Zn batteries. The interlayer improves the electrochemical stability and lifespan of Zn anodes, even under harsh conditions, and has been proven to be effective in full cells as well.
The Zn metal anode is considered one of the most promising anode choices for aqueous Zn-based batteries. Nevertheless, dendrites and intricate side reactions have hindered its usage. Herein, an elastic and anti-corrosive interlayer is introduced to address the problem. The idiosyncratic dielectric behavior of amorphous and nanostructured silicon nitride (Si3N4) is utilized to manipulate the ion kinetics, by uniformly dispersing its particles in polyacrylonitrile (PAN) to fabricate an interlayer attached to Zn metal (PSN-Zn). PAN serves as an elastic constraint to inhibit drastic dendrite evolution and blocks H2O/O-2 corrosion, and Si3N4 with a high dielectric constant can facilitate the ion kinetics and endow uniform Zn deposition. The electrochemical stability and deposition consistency of the Zn anodes are greatly improved, with an extended lifespan of over 800 h at 1 mA cm(-2). Even under draconian deep-discharging (DODZn = 60%) and high current density (10 mA cm(-2)), the PSN-Zn anode can still operate stably for over 250 h. The effect of the dielectric property is systematically discussed and verified by experiments and theoretical simulations. Moreover, full cells with vanadium- and manganese-based cathodes also deliver excellent performance, indicating the use of the multifunctional interlayer as an appealing approach for rechargeable aqueous zinc batteries.
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