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Facile fabrication of carbon-encapsulated NaVPO4F nanocomposite as a high-rate and long-cycle life cathode material for sodium energy storage
Journal of Physics and Chemistry of Solids ( IF 4.3 ) Pub Date : 2021-08-24 , DOI: 10.1016/j.jpcs.2021.110354
Yanmei Zuo 1 , Jinfang Yue 1 , Zhenxiong Ma 1 , Zhifang Zuo 1
Affiliation  

Sodium vanadium fluorophosphate (NaVPO4F) has got greater scientific attention as cathode material for sodium-ion batteries owing to its open framework structure, elevated redox potential, and high theoretical capacity. In this article, the designing and development of carbon-decorated NaVPO4F (NaVPO4F@C) composites were carried out via facile solution technique, followed by a solid-state reaction at different temperatures. XRD results indicate that all the NaVPO4F@C samples are indexed to the well-crystallized structure with monoclinic crystal. HRTEM images showed a uniform thin layer of carbon coated on the NaVPO4F particle surface. Among the fabricated samples, the NaVPO4F@C annealed at 750 °C (NaVPO4F@C-750 °C) exhibits the best sodium storage performances i.e., highest specific capacity, considerable rate capacity and cycling stability. The NaVPO4F@C-750 °C delivers a high discharge capacity of 116.2 mAh g−1 at 0.1 C, which is around 81.3% of the theoretical capacity (143 mAh g−1). Furthermore, it may indicate an elevated reversible capacity (104.3 mAh g−1 at 2 C) post 300 cycles with a lower capacity fading ratio of around 0.012% per cycle.



中文翻译:

轻松制备碳包覆的 NaVPO4F 纳米复合材料作为钠能量储存的高倍率和长循环寿命阴极材料

氟磷酸钒钠(NaVPO 4 F)由于其开放的骨架结构、较高的氧化还原电位和较高的理论容量,作为钠离子电池的正极材料受到了更多的科学关注。在本文中,碳修饰的 NaVPO 4 F (NaVPO 4 F@C) 复合材料的设计和开发是通过简易溶液技术进行的,然后在不同温度下进行固相反应。XRD 结果表明,所有 NaVPO 4 F@C 样品均具有单斜晶系的良好结晶结构。HRTEM 图像显示在 NaVPO 4 F 颗粒表面上有一层均匀的碳薄层。在制备的样品中,NaVPO 4在 750 °C 下退火的 F@C (NaVPO 4 F@C-750 °C) 表现出最好的钠存储性能,最高的比容量、可观的倍率容量和循环稳定性。NaVPO 4 F@C-750 °C在 0.1 C下提供 116.2 mAh g -1的高放电容量,约为理论容量(143 mAh g -1)的81.3% 。此外,这可能表明在 300 次循环后可逆容量升高(2 C时为104.3 mAh g -1),每个循环的容量衰减率较低,约为 0.012%。

更新日期:2021-08-27
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