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High-Crystallinity MnO2 with Enhanced Structural Integrity for Aqueous Zn2+ Storage.

Yunkai Xu1,2,3, Qianwen Dong3, Hongfei Zheng3

  • 1School of Biological and Chemical Engineering, NingboTech University, Ningbo315199, China.

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|April 28, 2026
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Summary
This summary is machine-generated.

High-temperature calcination of manganese dioxide (MnO2) creates a highly crystalline cathode material for aqueous zinc ion batteries (AZIBs). This novel synthesis route enhances structural integrity, leading to superior cycling stability and long-lasting battery performance.

Keywords:
MnO2aAqueous batterycathodemetal oxideszinc ion battery

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Energy Storage

Background:

  • Manganese dioxide (MnO2) is a potential cathode material for aqueous zinc ion batteries (AZIBs).
  • Jahn-Teller distortion and dissolution limit MnO2 performance in AZIBs.
  • Conventional synthesis methods often result in structural degradation.

Purpose of the Study:

  • To develop a high-crystallinity layered MnO2 cathode material for AZIBs.
  • To improve the structural integrity and cycling stability of MnO2 cathodes.
  • To explore novel synthesis routes for advanced AZIB cathode materials.

Main Methods:

  • High-temperature calcination of MnO2 at 800 °C.
  • Morphological and structural characterization of the synthesized MnO2.
  • Electrochemical performance testing of AZIBs using the synthesized cathode.

Main Results:

  • High-crystallinity layered MnO2 (MnO2-cal) with ordered lamellar morphology was synthesized.
  • MnO2-cal demonstrated superior cycling stability without Mn2+ additives.
  • Reversible capacity of ~135 mAh g-1 with negligible capacity fading was achieved.
  • Ex situ XRD and XAS confirmed reversible structural evolution and stable Mn-O coordination.

Conclusions:

  • High-temperature calcination is an effective method for synthesizing robust MnO2 cathodes for AZIBs.
  • The synthesized MnO2-cal exhibits enhanced structural integrity and electrochemical performance.
  • This work offers a new perspective for developing long-life AZIB cathodes.