Investigations on New Electrolyte Composition and Modified Membrane for High Voltage Zinc−Manganese Hybrid Redox Flow Batteries

Abstract

In this work, the effect of electrolyte composition and the pore filled membrane was investigated in zinc−manganese (Zn−Mn) hybrid redox flow battery (HRFB). Among the studied electrolytes compositions, sulfate‐based electrolyte composition exhibits an improved performance at various conditions. Further, to minimize the ion crossover, the Daramic membrane is modified using polyacrylonitrile (PAN) as a pore filling agent. Hence, the flow cell fabricated with the optimized electrolyte and modified membrane enhanced the overall cell performance, particularly the energy efficiency of 75.45 % was achieved for the optimized conditions. As configured Zn−Mn flow cell system showed high avg. discharge plateau of 1.91 V at 10 mA cm−2. Further, the cell employed the modified membrane experienced the highly improved performance up to 40 mA cm−2. Besides that, the durability of the Zn−Mn system employing PAN filled Daramic membrane revealed the consistent cell performance over 100 galvanostatic charge‐discharge (GCD) cycles. Thus, the proposed sulfate‐based precursors electrolyte combinations and PAN filled Daramic membrane can be considered as a proficient candidate for obtaining better performance Zn−Mn flow cell system.

Theory‐Driven Design of a Cationic Accelerator for High‐Performance Electrolytic MnO2–Zn Batteries

“…Our assembled CA-regulated MnO 2 -Zn battery maintained high energy efficiency and long-term cycle stability at high discharge rate, highlighting the advantages of the cationic accelerating strategy (Figure 5g and Table S5). [4,7,9,[21][22][23][24][25][26][27][28][29] Such superior performances of the CA-regulated MnO 2 -Zn battery outperform most of the reported aqueous batteries, demonstrated its feasibility in the field of large-scale energy storage applications.…”

Energy storage mechanism, advancement, challenges, and perspectives on vivid manganese redox couples

“…Moreover, the Zn/Mn flow cell delivered a maximum energy density of 12.31 W h L −1 at 34.19 W L −1 in 40 mA cm −2 current density. 81 However, severe deposition of MnO 2 over a period of long cycling was observed that affects the Zn/Mn RFB performance. To tackle the MnO 2 dissolution in manganese based RFBs, recently Lei et al .…”

Recent Progress in High‐voltage Aqueous Zinc‐based Hybrid Redox Flow Batteries

“…The single membrane systems are most widely used because of their facile assembly, and eco‐friendly electrolytes [93–95] . Xie et al.…”