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Journal Article
High-voltage and dendrite-free zinc-iodine flow battery
2024
Overview
Zn-I
2
flow batteries, with a standard voltage of 1.29 V based on the redox potential gap between the Zn
2+
-negolyte (−0.76 vs. SHE) and I
2
-posolyte (0.53 vs. SHE), are gaining attention for their safety, sustainability, and environmental-friendliness. However, the significant growth of Zn dendrites and the formation of dead Zn generally prevent them from being cycled at high current density (>80 mA cm
−2
). In addition, the crossover of Zn
2+
across cation-exchange-membrane also limits their cycle stability. Herein, we propose a chelated Zn(P
2
O
7
)
2
6-
(donated as Zn(PPi)
2
6-
) negolyte, which facilitates dendrite-free Zn plating and effectively prevents Zn
2+
crossover. Remarkably, the utilization of chelated Zn(PPi)
2
6-
as a negolyte shifts the Zn
2+
/Zn plating/stripping potential to −1.08 V (vs. SHE), increasing cell voltage to 1.61 V. Such high voltage Zn-I
2
flow battery shows a promising stability over 250 cycles at a high current density of 200 mA cm
−2
, and a high power density up to 606.5 mW cm
−2
.
Researchers reported a 1.6 V dendrite-free zinc-iodine flow battery using a chelated Zn(PPi)
2
6-
negolyte. The battery demonstrated stable operation at 200 mA cm
−2
over 250 cycles, highlighting its potential for energy storage applications.
