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Sustainable All-Mn-Based Layered Cathode with Dynamic Structural Stability for Durable Sodium-Ion Batteries.

Xuchun Chen1, Guangliang Lin1, Yuyu Deng1

  • 1State Key Laboratory of Advanced Chemical Power Sources, Frontiers Science Center for New Organic Matter, Academy for Advanced Interdisciplinary Studies, Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education), College of Chemistry, Nankai University, Tianjin, China.

Advanced Materials (Deerfield Beach, Fla.)
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PubMed
Summary

This study introduces a new cathode material (NZMCO) that prevents structural degradation in layered sodium manganese oxide batteries. By dynamically regulating the structure, it achieves exceptional cycling stability and high capacity for advanced energy storage.

Keywords:
dynamic structural variationhierarchical damping‐like strategylayered all‐manganese‐based cathodelocal coordination optimizationsodium‐ion batteries

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Solid-state Chemistry

Background:

  • Layered sodium all-manganese-based oxides suffer from structural degradation during battery cycling, primarily due to MnO6 layer gliding and Jahn-Teller distortion.
  • Conventional strategies focusing on reducing initial Mn3+ content are insufficient for long-term structural integrity.

Purpose of the Study:

  • To develop a novel cathode material that ensures long-term structural integrity and cycling stability in layered sodium all-manganese-based oxide batteries.
  • To demonstrate that dynamic structural regulation, rather than static valence control, is key to preventing degradation pathways.

Main Methods:

  • Design of a P'2-type Na0.64Zn0.07Mn0.92Cu0.08O2 (NZMCO) cathode material.
  • Implementation of a hierarchical damping-like mechanism involving intralayer coordination tuning and interlayer electrostatic shielding.
  • Evaluation of electrochemical performance, including specific capacity and cycling stability at various current densities.

Main Results:

  • The NZMCO cathode exhibits exceptional cycling stability, retaining 87.53% of its initial capacity after 1500 cycles at 2000 mA g-1.
  • Achieved a high specific capacity of 194.95 mAh g-1 at 20 mA g-1.
  • The designed framework effectively alleviates lattice strain, suppresses microcracks, and reduces transition metal dissolution.

Conclusions:

  • Dynamic structural regulation is a more effective strategy than static valence control for enhancing the stability of layered sodium all-manganese-based oxide cathodes.
  • The developed NZMCO material offers a sustainable pathway for high-performance, long-lasting sodium-ion batteries.
  • This work shifts the design paradigm towards dynamic structural adaptation for advanced cathode materials.