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Bromine Assisted MnO 2 Dissolution Chemistry: Toward a Hybrid Flow Battery with Energy Density of over 300 Wh L −1

Journal Article · · Angewandte Chemie (International Edition)
 [1];  [2];  [2]
  1. Division of Energy Storage Dalian Institute of Chemical Physics Chinese Academy of Sciences Dalian 116023 China; University of Chinese Academy of Sciences Beijing 100049 China
  2. Division of Energy Storage Dalian Institute of Chemical Physics Chinese Academy of Sciences Dalian 116023 China
Abstract

Mn2+/Mn3+redox pair has been considered as a promising cathode for high energy density batteries, due to its attractive features of high redox potential, solubility and outstanding kinetics. However, the disproportionation side reaction of Mn3+, which results in accumulation of “dead” MnO2limits its reversibility and further energy density. Herein, a novel catholyte based on mixture of Mn2+and Brwas proposed for flow batteries with high energy density and long cycle life. In the design, the “dead” MnO2can be fully discharged via Brby a chemical‐electrochemical reaction. Coupled with Cd/Cd2+as anode, the assembled Bromine‐Manganese flow battery (BMFB) demonstrates a high energy efficiency of 76 % at 80 mA cm−2with energy density of 360 Wh L−1. The battery assembled with silicotungstic acid as anode could continuously run for over 2000 cycles at 80 mA cm−2. With high power density, energy density and durability, the BMFB shows great potential for large‐scale energy storage.

Research Organization:
US DOE-Chinese Academy of Sciences for Cooperation in Energy Sciences, Washington, DC (United States)
Sponsoring Organization:
USDOE
OSTI ID:
2424968
Journal Information:
Angewandte Chemie (International Edition), Journal Name: Angewandte Chemie (International Edition) Journal Issue: 51 Vol. 61; ISSN 1433-7851
Publisher:
Wiley
Country of Publication:
United States
Language:
English

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