Abstract
It is a difficult challenge to simultaneously employ the cationic and anionic redox chemistry in cathode materials for sodium-ion batteries with high energy. Even though layered oxides (classified as two-dimensional oxides) demonstrate excellent promise in the high discharge capacity, their poor oxygen transformation via redox reactions is limited by crystal instability. Therefore, a do** strategy was conceived to tackle this issue and increase redox efficiency. K do** was applied to transform the two-dimensional Na1.3Mn0.7O2 (NMO) to three-dimensional K0.2Na1.3Mn0.5O2 (KNMO), preventing the irreversible phase shift and preserving the crystal structure’s stability while cycling. With this modification treatment, KNMO features manganese and oxygen reactive sites, delivering a promising energy density of 190 mAh·g−1 at 5 mA·g−1 in the 2.0–4.5 V voltage range (vs. 71.4 mAh·g−1 for the pristine NMO). Moreover, it displays improved capacity retention of more than 83.5% after 50 cycles at 50 mA·g−1. The results demonstrated that doped intercalation oxides were promising for redox oxygen transformation in sodium-ion batteries.
Graphical abstract
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摘要
同时利用阳离子和阴离子氧化还原反应活性是开发下一代高容量钠离子电池**极材料的一大挑战。尽管层状氧化物(二维氧化物)具有高容量优点,但由于二维晶体的不稳定性,晶格氧的氧化还原反应可逆性差。因此,我们设想了一种掺杂策略来解决这个问题。利用 K 掺杂将二维 Na1.3Mn0.7O2 (NMO)转化为三维 K0.2Na1.3Mn0.5O2-(KNMO),这种方法防止了不可逆相变,并保持了循环时晶体结构的稳定性。通过这种改性处理,KNMO 具有锰和氧反应位点,在 2.0-4.5 V 电压范围内,在 5 mA·g-1 时提供了 190 mAh·g-1 的能量密度(而原始 NMO 为 71.4 mAh·g-1)。此外,在 50 mA· g-1 下循环 50 次后,容量保持率达到了83.5%以上。结果表明,通过掺杂调控结构特性从而稳定晶格氧的氧化还原活性和稳定性策略在开发下一代高性能钠离子电池**极材料中具有重大前景。
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Change history
13 July 2024
A Correction to this paper has been published: https://doi.org/10.1007/s12598-024-02901-8
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Acknowledgements
This work was financially supported by the Scientific Research Startup Fund for Shenzhen High-Caliber Personnel of SZPT (No. 6021310029K) and Research Projects of Department of Education of Guangdong Province (No. 2023KTSCX319).
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Xu, JH., Zhu, YH., Yang, WM. et al. K do** stabilizes three-dimensional K0.2Na1.3Mn0.5O2-d as high-performance cathode for sodium-ion batteries. Rare Met. (2024). https://doi.org/10.1007/s12598-024-02814-6
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DOI: https://doi.org/10.1007/s12598-024-02814-6