Journal
CHEMELECTROCHEM
Volume 7, Issue 7, Pages 1531-1536Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/celc.201902030
Keywords
zinc-bromine battery; high voltage; high energy density; K+-conducting membrane; hybrid electrolytes
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Funding
- Distinguished Young Scientists Program of the National Natural Science Foundation of China [51425301, U1601214]
- National Natural Science Foundation of China [51772093]
- Distinguished Young Scientists Program of the Natural Science Foundation of Hunan [2019JJ20010]
- China's double first-class project [SYL201802008]
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The zinc-bromine redox flow battery (ZBB) is an ideal device of energy storage systems. Nevertheless, its energy density is relatively low compared to those of Li-ion batteries, due to its low output voltage. Herein, a high-voltage aqueous hybrid zinc-bromine battery system (AHZBBs) was developed, where K+-conducting membrane was used to segregate neutral-alkaline hybrid electrolytes and redox couples of Br-2/Br(-)and [Zn(OH)(4)](2-)/Zn at the positive and negative electrode. Benefited from an efficient and stable cathode catalyst (carbon-manganite nanoflakes), this AHZBB delivered a high average output voltage of 2.15 V and energy density of 276.7 Wh/kg without capacity attenuation after 200 cycles. More importantly, this work provides an efficient avenue to elevating the output voltage and energy density, and will strongly encourage studies on redox flow batteries.
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