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<p>O3<b>-</b>type layered oxide cathode materials have garnered substantial attention owing to their high theoretical capacity and low cost, making them one of the most promising candidates for sodium-ion battery (SIB) cathodes. Nevertheless, their practical application is hindered by insufficient structural stability and inferior rate capability. Rational morphology engineering emerges as a viable strategy to alleviate these drawbacks, as it can enlarge the Na<sup>+</sup> interlayer spacing, increase the electroactive surface area, and thereby enhance both structural integrity and ionic transport kinetics. In this study, a co-precipitation method was adopted to regulate the morphology of the Fe<sub>0.5</sub>Mn<sub>0.5</sub>(OH)<sub>2</sub> precursor (denoted as FM-X) by tailoring the reaction environment. The ultimately synthesized O3-Na<sub>0.87</sub>Fe<sub>0.5</sub>Mn<sub>0.5</sub>O<sub>2</sub> cathode material (denoted as NFMO-X) exhibit distinct morphologies and microstructures. Notably, the NFMO-9.5 sample, prepared at pH = 9.5 with a hexagonal block-like morphology, possesses high crystallinity, abundant surface active sites exposed {010} planes, and an expanded Na<sup>+</sup> interlayer spacing. These favorable characteristics endow NFMO-9.5 with the highest initial discharge specific capacity (163.61 mAh g<sup>− 1</sup> at 0.1&#xa0;C), better capacity retention rate (73% after 100 cycles at 1.0&#xa0;C), and superior Na<sup>+</sup> diffusion coefficient (2.6 × 10<sup>− 14</sup> cm<sup>2</sup> s<sup>− 1</sup>). This study reveals the correlation between material morphology, microstructure and electrochemical performance, providing valuable insights for the rational design of high-performance SIB cathode materials.</p> Graphical Abstract <p></p>

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Morphology Engineering Enables Structural Stability and Kinetics of O3-Na0.87Fe0.5Mn0.5O2 Cathode Material for Sodium-Ion Batteries

  • 期刊论文

  • 发表日期：

    2026年4月11日

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  • HaoFeng Tan,
  • Shan Jin,
  • JunXia Meng,
  • ChaoHui Chen,
  • DeHao Fu,
  • YingXiang Zhong,
  • Qian Zhang,
  • QuanXin Ma

摘要

O3-type layered oxide cathode materials have garnered substantial attention owing to their high theoretical capacity and low cost, making them one of the most promising candidates for sodium-ion battery (SIB) cathodes. Nevertheless, their practical application is hindered by insufficient structural stability and inferior rate capability. Rational morphology engineering emerges as a viable strategy to alleviate these drawbacks, as it can enlarge the Na+ interlayer spacing, increase the electroactive surface area, and thereby enhance both structural integrity and ionic transport kinetics. In this study, a co-precipitation method was adopted to regulate the morphology of the Fe0.5Mn0.5(OH)2 precursor (denoted as FM-X) by tailoring the reaction environment. The ultimately synthesized O3-Na0.87Fe0.5Mn0.5O2 cathode material (denoted as NFMO-X) exhibit distinct morphologies and microstructures. Notably, the NFMO-9.5 sample, prepared at pH = 9.5 with a hexagonal block-like morphology, possesses high crystallinity, abundant surface active sites exposed {010} planes, and an expanded Na+ interlayer spacing. These favorable characteristics endow NFMO-9.5 with the highest initial discharge specific capacity (163.61 mAh g− 1 at 0.1 C), better capacity retention rate (73% after 100 cycles at 1.0 C), and superior Na+ diffusion coefficient (2.6 × 10− 14 cm2 s− 1). This study reveals the correlation between material morphology, microstructure and electrochemical performance, providing valuable insights for the rational design of high-performance SIB cathode materials.

Graphical Abstract