FeNCN/NC的受控相和结晶度主导钠储存性能,Dalton Transactions

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FeNCN/NC的受控相和结晶度主导钠储存性能
Dalton Transactions ( IF 3.5 ) Pub Date : 2022-04-19 , DOI: 10.1039/d2dt00924b
Hui Qi ₁ , Yan Hou ₁ , Wenjing Wang ₂ , Lin Tang ₁ , Chuanyun Zhang ₁ , Wen Deng ₁ , Yayi Cheng ₃ , Jingjing Zhang ₁

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FeNCN 是一种潜在的快速充电钠离子阳极，因为它存在许多宽隧道及其高电子导电性。然而，FeNCN由于其合成过程复杂、合成机理不明，影响了对其物相和结晶度的精确控制，鲜有研究。在这项工作中，通过调整生长时间和温度，成功地制备了在氮掺杂碳 (FeNCN/NC) 上生长的相位和结晶度控制的 FeNCN 多面体。此外，本文还公开了合成机理。高结晶度FeNCN沿[001]方向生长，在{010}面上暴露出足够宽的通道，显着提高了钠离子的扩散速率。此外，高结晶度的 FeNCN 表现出更高的机械强度，这降低了其粉碎率并赋予其持久的循环稳定性。当用作钠离子电池的阳极时，高结晶度 FeNCN/NC 表现出 332 mA hg 的高倍率能力^-1在 5.0 A g^-1和 368 mA hg^{-1的稳定循环性能在 1.0 A g}^-1的高电流密度下循环 300 次后。这项工作证实了通过调整其结晶度可以进一步提高 FeNCN 的钠离子存储性能。

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Controlled phase and crystallinity of FeNCN/NC dominating sodium storage performance

FeNCN is a potentially fast-charging sodium ion anode due to the presence of lots of broad tunnels and its high electronic conductivity. However, FeNCN has been rarely investigated due to its complicated synthetic process and unclear synthetic mechanism, which affect the precise control of its phase and crystallinity. In this work, phase- and crystallinity-controlled FeNCN polyhedrons grown on nitrogen-doped carbon (FeNCN/NC) are successfully fabricated by adjusting the growing time and temperature. Moreover, the synthesis mechanism is disclosed in this paper. High-crystallinity FeNCN grows along the [001] direction, which exposes sufficient broad channels on the {010} planes and significantly improves the diffusion rate of sodium ions. Moreover, high-crystallinity FeNCN exhibits higher mechanical strength, which reduces its pulverization rate and endows it with durable cycling stability. When applied as an anode in a sodium-ion battery, high-crystallinity FeNCN/NC exhibits a high rate capability of 332 mA h g⁻¹ at 5.0 A g⁻¹ and a stable cycling performance of 368 mA h g⁻¹ after 300 cycles at a high current density of 1.0 A g⁻¹. This work confirms that the sodium-ion storage performance of FeNCN can be further improved by tuning its crystallinity.

更新日期：2022-04-19

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