The development prospect of layered transition metal oxides in sodium-ion batteries is excellent, but there are some problems, such as poor cycle stability and a complex phase transition. The spherical NaNi_0.25Fe_0.15Mn_0.3Ti_0.1Sn_0.05Co_0.05Li_0.1O₂ (SP-HEO) has been developed to address the challenges faced by O3-type layered oxide in sodium-ion batteries. The SP-HEO material is synthesized by piling and high entropy. The multiple strategies combine to enhance the electrochemical performance and air stability. The SP-HEO demonstrated a specific discharge capacity of 150.1 mA h g^–1 at 0.1 C and 100.4 mA h g^–1 at 7 C. Ex situ XRD analysis confirmed that the SP-HEO effectively retards complex phase transitions. This study not only introduces a high-entropy design for high tap density spherical storage materials but also dispels industry concerns regarding the performance of sodium ion layered oxide cathode materials.

中文翻译：

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构建高性能球形 Na-ion 层状氧化物阴极的多种策略


层状过渡金属氧化物在钠离子电池中的发展前景极好，但也存在循环稳定性差、相变复杂等问题。球形 NaNi_0.25Fe_0.15Mn_0.3Ti_0.1Sn_0.05Co_0.05Li_0.1O₂ （SP-HEO） 的开发是为了解决钠离子电池中 O3 型层状氧化物面临的挑战。SP-HEO 材料是通过打桩和高熵合成的。多种策略相结合，可增强电化学性能和空气稳定性。SP-HEO 在 0.1 C 时表现出 150.1 mA h g^–1 的比放电容量，在 7 C 时为 100.4 mA h g^–1。非原位 XRD 分析证实 SP-HEO 有效延缓了复杂的相变。本研究不仅介绍了高振实密度球形存储材料的高熵设计，还消除了业界对钠离子层状氧化物正极材料性能的担忧。