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A Long Cycle Life, Self‐Healing Zinc–Iodine Flow Battery with High Power Density
Author(s) -
Xie Congxin,
Zhang Huamin,
Xu Wenbin,
Wang Wei,
Li Xianfeng
Publication year - 2018
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.201803122
Subject(s) - flow battery , electrolyte , zinc , polyolefin , battery (electricity) , power density , membrane , materials science , porosity , chemical engineering , dendrite (mathematics) , energy storage , chemistry , inorganic chemistry , nanotechnology , power (physics) , metallurgy , electrode , composite material , thermodynamics , engineering , physics , biochemistry , geometry , mathematics , layer (electronics)
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. Therefore, by consuming zinc dendrite, the battery can self‐recover from micro‐short‐circuiting resulting from overcharging. By using KI, ZnBr 2 , and KCl as electrolytes and a high ion‐conductivity porous membrane, a very high power density can be achieved. As a result, a ZIFB exhibits an energy efficiency (EE) of 82 % at 80 mA cm −2 , which is 8 times higher than the currently reported ZIFBs. Furthermore, a stack with an output of 700 W was assembled and continuously run for more than 300 cycles. We believe this ZIFB can lead the way to development of new‐generation, high‐performance flow batteries.