A Long Cycle Life, Self-Healing Zinc-Iodine Flow Battery with High Power Density

Journal Article · Mon May 14 00:00:00 EDT 2018 · Angewandte Chemie (International Edition)

DOI:https://doi.org/10.1002/anie.201803122· OSTI ID:1489906

Xie, Congxin ^[1]; Zhang, Huamin ^[2]; Xu, Wenbin ^[3]; Wang, Wei ^[4]; Li, Xianfeng  ^[2]

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1. Division of Energy Storage, Dalian National Lab for Clean Energy, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, 457 Zhongshan Road Dalian 116023 P. R. China; University of Chinese Academy of Sciences, Beijing 100039 P. R. China
2. Division of Energy Storage, Dalian National Lab for Clean Energy, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, 457 Zhongshan Road Dalian 116023 P. R. China; Collaborative Innovation Center of Chemistry for Energy Materials (iChEM), Dalian 116023 P. R. China
3. Division of Energy Storage, Dalian National Lab for Clean Energy, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, 457 Zhongshan Road Dalian 116023 P. R. China
4. Energy and Environment Directorate, Pacific Northwest National Laboratory, PO Box 999 Richland WA 99352 USA

A Zinc-iodine flow battery (ZIFB) with super long cycle life, high energy, power density and self-healing behavior was presented. The long cycle life was achieved by employing a low-cost porous polyolefin membrane with optimized pore structure and stable electrolytes. The pores in the polyolefin membrane can be filled with a solution containing oxidized I₃^- that can react with zinc dendrite. Therefore, by consuming zinc dendrite, the battery can self-recover from micro-short circuiting resulting from overcharging the battery. By using KI and ZnBr₂ as electrolytes and a high ion conductivity porous membrane, a very high power density can be achieved. As a result, the ZIFB exhibits an energy efficiency (EE) of 82% at 80 mA/cm² and 71% at 140 mA/cm², which is 8 times higher than the currently reported for ZIFBs. In addition, a long cycling life of more than 1000 cycles over 3 months with an energy density of more than 80 Wh/L was obtained at 80 mA/cm². Furthermore, a kW-class cell stack with an output of 700 W was assembled and continuously run for more than 300 cycles. We believe this ZIFB with its high power density, long cycle life, and high reliability can lead the way to development of new-generation, high-performance flow batteries.

• Research Organization: Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
• Sponsoring Organization: USDOE
• DOE Contract Number: AC05-76RL01830
• OSTI ID: 1489906
• Report Number(s): PNNL-SA-131307
• Journal Information: Angewandte Chemie (International Edition), Vol. 57, Issue 35; ISSN 1433-7851
• Publisher: Wiley
• Country of Publication: United States
• Language: English