MnO2 superstructure cathode with boosted zinc ion intercalation for aqueous zinc ion batteries

Aina Zhang, Xu Zhang, Hainan Zhao, Helmut Ehrenberg, Gang Chen, Ismael Saadoune, Qiang Fu, Yingjin Wei, Yizhan Wang

Research output: Contribution to journalArticlepeer-review

4 Scopus citations

Abstract

The simultaneous intercalation of protons and Zn2+ ions in aqueous electrolytes presents a significant obstacle to the widespread adoption of aqueous zinc ion batteries (AZIBs) for large-scale use, a challenge that has yet to be overcome. To address this, we have developed a MnO2/tetramethylammonium (TMA) superstructure with an enlarged interlayer spacing, designed specifically to control H+/Zn2+ co-intercalation in AZIBs. Within this superstructure, the pre-intercalated TMA+ ions work as spacers to stabilize the layered structure of MnO2 cathodes and expand the interlayer spacing substantially by 28 % to 0.92 nm. Evidence from in operando pH measurements, in operando synchrotron X-ray diffraction, and X-ray absorption spectroscopy shows that the enlarged interlayer spacing facilitates the diffusion and intercalation of Zn2+ ions (which have a large ionic radius) into the MnO2 cathodes. This spacing also helps suppress the competing H+ intercalation and the formation of detrimental Zn4(OH)6SO4·5H2O, thereby enhancing the structural stability of MnO2. As a result, enhanced Zn2+ storage properties, including excellent capacity and long cycle stability, are achieved.

Original languageEnglish
Pages (from-to)723-730
Number of pages8
JournalJournal of Colloid and Interface Science
Volume669
DOIs
StatePublished - 1 Sep 2024
Externally publishedYes

Keywords

  • Aqueous zinc ion batteries
  • In operando synchrotron diffraction
  • MnO
  • Superstructure
  • X-ray absorption spectroscopy

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Biomaterials
  • Surfaces, Coatings and Films
  • Colloid and Surface Chemistry

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