Are zinc-polyiodine flow batteries a high energy density battery?

Progress and challenges of zinc‑iodine flow batteries: From energy storage mechanism to key components. Based on the ambipolar characteristics and high solubility of ZnI2, zinc-polyiodide flow batteries (ZIFB) have attracted attention as high-energy density flow batteries.

What is a zinc-polyiodide flow battery?

With the high-energy density and its benign nature free from strong acids and corrosive components, zinc-polyiodide flow battery is a promising candidate for various energy storage applications. Conventional redox flow batteries have low energy densities.

What are zinc poly halide flow batteries?

Zinc poly-halide flow batteries are promising candidates for various energy storage applications with their high energy density, free of strong acids, and low cost . The zinc‑chlorine and zinc‑bromine RFBs were demonstrated in 1921, and 1977 , respectively, and the zinc‑iodine RFB was proposed by Li et al. in 2015 .

What is a zinc iodine flow battery (zifb)?

A zinc–iodine flow battery (ZIFB) with long cycle life, high energy, high power density, and self-healing behavior is prepared. The long cycle life was achieved by employing a low-cost porous polyolefin membrane and stable electrolytes. The pores in the membrane can be filled with a solution containing I 3− that can react with zinc dendrite.

What is the energy density of zinc-polyiodide flow battery (ZIB)?

Capitalizing on the high solubility of the I − /I x− redox species, the zinc-polyiodide flow battery (ZIB) has a theoretical energy density of ~322 Wh l −1 at the solubility limit of ZnI 2 in the water (4,500 g l −1, 7.0 M).

How much energy does an aqueous zinc-iodine battery produce?

Therefore, the aqueous zinc-iodine battery exhibited a significant volume of 1647.3 mW h cm −3 and a high energy density of 2339.1 μW h cm −2.