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<p>Sodium-ion batteries (SIBs) have become one of the most compelling candidates for large-scale electrochemical energy storage systems due to advantages such as the low-cost sodium sources and a working principle similar to those of lithium-ion batteries. The problem of suboptimal cycle stability of layered cathode materials for sodium-ion batteries has always restricted the development of the practical applications of these batteries. This paper reports a hydrothermal method for synthesizing lamellar P2-Na<sub>0.7</sub>CoO<sub>2</sub> material (H-NCO). The sodium cobaltate synthesized via this method demonstrates outstanding cycling performance and rate capabilities. Specifically, after 900 cycles at a current of 250 mA g<sup>−1</sup>, the capacity retention rate is 69.4%, and at a current of 12.5 mA g<sup>−1</sup>, it can provide a maximum capacity of 110 mAh g<sup>−1</sup>. Compared with the currently reported layered oxide cathode materials, its cycling performance is outstanding. Moreover, the synthesis process is simple, making it valuable for popularization and application.</p>

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Lamellar P2-Na0.7CoO2 enables long-cycle life of sodium-ion batteries

  • 期刊论文

  • 发表日期：

    2025年8月4日

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  • Jinhui Li,
  • Shudong Xiong,
  • Jiaming Liu,
  • Yupeng Zhu,
  • Kun Luo,
  • Shouxun Peng,
  • Luping Feng,
  • Yan Gao

摘要

Sodium-ion batteries (SIBs) have become one of the most compelling candidates for large-scale electrochemical energy storage systems due to advantages such as the low-cost sodium sources and a working principle similar to those of lithium-ion batteries. The problem of suboptimal cycle stability of layered cathode materials for sodium-ion batteries has always restricted the development of the practical applications of these batteries. This paper reports a hydrothermal method for synthesizing lamellar P2-Na0.7CoO2 material (H-NCO). The sodium cobaltate synthesized via this method demonstrates outstanding cycling performance and rate capabilities. Specifically, after 900 cycles at a current of 250 mA g−1, the capacity retention rate is 69.4%, and at a current of 12.5 mA g−1, it can provide a maximum capacity of 110 mAh g−1. Compared with the currently reported layered oxide cathode materials, its cycling performance is outstanding. Moreover, the synthesis process is simple, making it valuable for popularization and application.