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Fully exploited imidazolium bromide for simultaneous resolution of cathode and anode challenges in zinc-bromine batteries

Hu, Linyu ; Dai, Chunlong ; Zhu, Yudong ; Hou, Xu LU orcid ; Liu, Zhimeng ; Geng, Xin ; Wang, Hailong ; Chen, Jing ; Sun, Nuo and Rong, Qinlang , et al. (2024) In Energy and Environmental Science 17(15). p.5552-5562
Abstract

Aqueous zinc-bromine (Zn-Br2) batteries feature operational safety and high-energy and high-power densities, but suffer from polybromide dissolution in the cathode and the low reversibility of Zn metal in the anode. Here, we demonstrate that these challenges can be simultaneously tackled by using a fully exploited imidazolium bromide (MPIBr). An in-depth analysis demonstrates that MPIBr enhances both the reversibility and kinetics of Zn anodes. This enhancement arises from MPI+ cations participating in the formation of an H2O-scarce inner Helmholtz plane, suppressing water-associated side reactions. Additionally, electron-donating Br− ions contribute to the Zn2+-solvation sheath,... (More)

Aqueous zinc-bromine (Zn-Br2) batteries feature operational safety and high-energy and high-power densities, but suffer from polybromide dissolution in the cathode and the low reversibility of Zn metal in the anode. Here, we demonstrate that these challenges can be simultaneously tackled by using a fully exploited imidazolium bromide (MPIBr). An in-depth analysis demonstrates that MPIBr enhances both the reversibility and kinetics of Zn anodes. This enhancement arises from MPI+ cations participating in the formation of an H2O-scarce inner Helmholtz plane, suppressing water-associated side reactions. Additionally, electron-donating Br− ions contribute to the Zn2+-solvation sheath, forming [Zn(H2O)5Br]+ that promotes Zn2+ migration and faster interfacial kinetics. Furthermore, the robust chelation between the MPI+ cation and Brx− species significantly impedes shuttling. Notably, the Br− anion and Zn2+ cation in the electrolyte can construct a dual-plating Zn-Br2 battery, eliminating the necessity for active materials on both the cathode and anode. The as-prepared dendrite-free and shuttle-free dual-plating Zn-Br2 batteries demonstrate stable cycling for 1000 cycles even under 100% depth of discharge. This work deepens the understanding of electrolyte composition on electrode interfaces, driving the advancement of high-performance and cost-effective Zn-halogen batteries.

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publishing date
type
Contribution to journal
publication status
published
in
Energy and Environmental Science
volume
17
issue
15
pages
11 pages
publisher
Royal Society of Chemistry
external identifiers
  • scopus:85198169841
ISSN
1754-5692
DOI
10.1039/d4ee02096k
language
English
LU publication?
no
additional info
Publisher Copyright: © 2024 The Royal Society of Chemistry.
id
b3b28628-c2a3-4931-b600-6bd47af035a6
date added to LUP
2025-12-05 22:23:33
date last changed
2025-12-09 14:57:32
@article{b3b28628-c2a3-4931-b600-6bd47af035a6,
  abstract     = {{<p>Aqueous zinc-bromine (Zn-Br<sub>2</sub>) batteries feature operational safety and high-energy and high-power densities, but suffer from polybromide dissolution in the cathode and the low reversibility of Zn metal in the anode. Here, we demonstrate that these challenges can be simultaneously tackled by using a fully exploited imidazolium bromide (MPIBr). An in-depth analysis demonstrates that MPIBr enhances both the reversibility and kinetics of Zn anodes. This enhancement arises from MPI<sup>+</sup> cations participating in the formation of an H<sub>2</sub>O-scarce inner Helmholtz plane, suppressing water-associated side reactions. Additionally, electron-donating Br<sup>−</sup> ions contribute to the Zn<sup>2+</sup>-solvation sheath, forming [Zn(H<sub>2</sub>O)<sub>5</sub>Br]<sup>+</sup> that promotes Zn<sup>2+</sup> migration and faster interfacial kinetics. Furthermore, the robust chelation between the MPI<sup>+</sup> cation and Br<sub>x</sub><sup>−</sup> species significantly impedes shuttling. Notably, the Br<sup>−</sup> anion and Zn<sup>2+</sup> cation in the electrolyte can construct a dual-plating Zn-Br<sub>2</sub> battery, eliminating the necessity for active materials on both the cathode and anode. The as-prepared dendrite-free and shuttle-free dual-plating Zn-Br<sub>2</sub> batteries demonstrate stable cycling for 1000 cycles even under 100% depth of discharge. This work deepens the understanding of electrolyte composition on electrode interfaces, driving the advancement of high-performance and cost-effective Zn-halogen batteries.</p>}},
  author       = {{Hu, Linyu and Dai, Chunlong and Zhu, Yudong and Hou, Xu and Liu, Zhimeng and Geng, Xin and Wang, Hailong and Chen, Jing and Sun, Nuo and Rong, Qinlang and Zhu, Yuhao and He, Xin and Lin, Yuanjing}},
  issn         = {{1754-5692}},
  language     = {{eng}},
  month        = {{06}},
  number       = {{15}},
  pages        = {{5552--5562}},
  publisher    = {{Royal Society of Chemistry}},
  series       = {{Energy and Environmental Science}},
  title        = {{Fully exploited imidazolium bromide for simultaneous resolution of cathode and anode challenges in zinc-bromine batteries}},
  url          = {{http://dx.doi.org/10.1039/d4ee02096k}},
  doi          = {{10.1039/d4ee02096k}},
  volume       = {{17}},
  year         = {{2024}},
}