Synergistic effect of electrolyte additives on the suppression of dendrite growth in a flowless membraneless Zn–Br2 battery

Aqueous ZnBr2 batteries (ZBBs), particularly in flowless and membraneless form (FLML-ZBB), offer a cost-effective and promising large-scale energy storage system. Unfortunately, these batteries suffer from unavoidable Zn dendrite growth and inherent cross-diffusion of volatile and corrosive soluble...

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Bibliographic Details
Published in:Journal of power sources 2023-10, Vol.580, p.233212, Article 233212
Main Authors: Park, Hyeonghun, Park, Geumyong, Kumar, Santosh, Yoon, Hocheol, Baek, Juyeon, Tamulevičius, Tomas, Tamulevičius, Sigitas, Kim, Hyeong-Jin
Format: Article
Language:English
Subjects:
Coulombic efficiency
Dendrite inhibition
Electrochemical energy storage
Membrane free
Metal ion additive
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Summary:Aqueous ZnBr2 batteries (ZBBs), particularly in flowless and membraneless form (FLML-ZBB), offer a cost-effective and promising large-scale energy storage system. Unfortunately, these batteries suffer from unavoidable Zn dendrite growth and inherent cross-diffusion of volatile and corrosive soluble Br3− species, which can eventually lead to a short circuit and serious self-discharge of the battery, respectively. To address these challenges, a single chamber FLML-ZBB is demonstrated in which the synergic effect of various metal ions (Li+, Na+, K+, Mn2+, and Cr3+) suppresses Zn dendritic growth. In addition, the use of a bromine complexing agent (BCA), 1-ethylpyridinium bromide (1-EPBr), efficiently inhibits cross-diffusion and induces reversible complexation of Br2/Br3−. The experimental results reveal that a battery with both Mn2+ ions and 1-EPBr electrolyte additives shows stable operation and exhibits a high Coulombic efficiency of 98.5% over 700 charge/discharge cycles at a high current density of 20 mA cm−2 and a long cycle life (1600 cycles) of over 3200 h at 1 mA cm−2. [Display omitted] •Various metal ions are introduced into the electrolyte for Zn dendrite suppression through electrostatic shielding effect.•The effects of various metal ions and the selection criteria are investigated.•As the valence number of metal ions increase, the denser Zn deposition is observed.•Mn2+ achieves a superior electrochemical performance without side reactions.
ISSN:0378-7753
DOI:10.1016/j.jpowsour.2023.233212