中文 |

Newsroom

Scientists Develop Manganese-based Hybrid Single Flow Battery with High Energy Density

Nov 30, 2022

A research group led by Prof. LI Xianfeng from the Dalian Institute of Chemical Physics (DICP) of the Chinese Academy of Sciences (CAS) has developed a Bromine-assisted-MnO2-based hybrid single flow battery, which exhibits advantages of high energy density and reversibility.

This study was published in Angewandte Chemie International Edition on Oct. 26.

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" MnO2, limits its reversibility and energy density.

In this study, the researchers provided a new concept to solve the issue of "dead" MnO2 by introducing Br-/Br2 into Mn2+/MnO2 catholyte in a highly acidic environment.

Br- was firstly oxidized to Br2 during charge, and then Mn2+ was oxidized to Mn3+, which could be partially disproportionated to form MnO2 simultaneously. During discharge, Mn3+ and part of MnO2 were reduced to Mn2+ firstly and Br2 was reduced to Br-. Then the produced Br- could react with "dead" MnO2 to Br2, participating in discharge, completing the reduction process, and avoiding the accumulation of "dead" MnO2.

Furthermore, the researchers assembled Bromine-Manganese flow battery (BMFB) coupling with Cd/Cd2+ as anode. The battery exhibited high energy density of 360 Wh L-1 and stable running for over 500 cycles at a current density of 80 mA cm-2.

"The battery assembled with silicotungstic acid as anode could continuously run for over 2000 cycles at 80 mA cm-2, which further confirmed the reliability and universality of the catholyte," said Prof. LI. "We believe the BMFB has great potential for large-scale energy storage."

Contact

WANG Yongjin

Dalian Institute of Chemical Physics

E-mail:

Bromine Assisted MnO2 Dissolution Chemistry: Toward a Hybrid Flow Battery with Energy Density of over 300 Wh L-1

Related Articles
Contact Us
  • 86-10-68597521 (day)

    86-10-68597289 (night)

  • 86-10-68511095 (day)

    86-10-68512458 (night)

  • cas_en@cas.cn

  • 52 Sanlihe Rd., Xicheng District,

    Beijing, China (100864)

Copyright © 2002 - Chinese Academy of Sciences