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<p>Sodium-ion batteries, as candidates for next-generation large-scale energy storage technology, rely heavily on the development of high-performance, low-cost electrode materials. The layered oxide <i>β</i>-NaMnO<sub>2</sub> has attracted significant attention due to its high theoretical specific capacity, but its practical application is severely limited by inherent structural instability and the Jahn-Teller effect of Mn<sup>3+</sup>. In this study, a Cu/Ti co-doped layered oxide cathode material, <i>β</i>-NaMn<sub>0.8</sub>Cu<sub>0.1</sub>Ti<sub>0.1</sub>O<sub>2</sub> (NMCTO), was designed and successfully synthesized. A high-temperature solid-state method combined with liquid nitrogen quenching was employed to stabilize the material’s structure and optimize its electrochemical performance. The crystal structure and microscopic morphology of the material were systematically characterized using techniques such as X-ray diffraction (XRD), and scanning electron microscopy (SEM). Electrochemical test results demonstrated that compared to undoped <i>β</i>-NaMnO<sub>2</sub> (NMO), the NMCTO material exhibits significantly improved overall performance. Furthermore, the synergistic effect of Cu/Ti co-doping effectively suppressed phase transitions and capacity fading during cycling, markedly enhancing the material’s structural stability and cycle life. This study provides new insights and solid experimental evidence for addressing key challenges in layered oxide cathode materials for sodium-ion batteries through multi-element doping and process innovation.</p>

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Cu/Ti co-doping for enhancing stability of β-NaMnO2 cathode in sodium-ion batteries

  • 期刊论文

  • 发表日期：

    2026年6月19日

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  • Xueping Zhang,
  • Peng Ding,
  • Yu Zhou,
  • Kemeng Guan,
  • Luping Liu,
  • Yunjian Liu

摘要

Sodium-ion batteries, as candidates for next-generation large-scale energy storage technology, rely heavily on the development of high-performance, low-cost electrode materials. The layered oxide β-NaMnO2 has attracted significant attention due to its high theoretical specific capacity, but its practical application is severely limited by inherent structural instability and the Jahn-Teller effect of Mn3+. In this study, a Cu/Ti co-doped layered oxide cathode material, β-NaMn0.8Cu0.1Ti0.1O2 (NMCTO), was designed and successfully synthesized. A high-temperature solid-state method combined with liquid nitrogen quenching was employed to stabilize the material’s structure and optimize its electrochemical performance. The crystal structure and microscopic morphology of the material were systematically characterized using techniques such as X-ray diffraction (XRD), and scanning electron microscopy (SEM). Electrochemical test results demonstrated that compared to undoped β-NaMnO2 (NMO), the NMCTO material exhibits significantly improved overall performance. Furthermore, the synergistic effect of Cu/Ti co-doping effectively suppressed phase transitions and capacity fading during cycling, markedly enhancing the material’s structural stability and cycle life. This study provides new insights and solid experimental evidence for addressing key challenges in layered oxide cathode materials for sodium-ion batteries through multi-element doping and process innovation.