Phosphorus-Doped Hard Carbon Nanofibers Prepared by Electrospinning as an Anode in Sodium-Ion Batteries,ACS Applied Materials & Interfaces

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Phosphorus-Doped Hard Carbon Nanofibers Prepared by Electrospinning as an Anode in Sodium-Ion Batteries
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2018-06-04 00:00:00 , DOI: 10.1021/acsami.8b05618
Feng Wu _{1,

2} , Ruiqi Dong ₁ , Ying Bai ₁ , Yu Li ₁ , Guanghai Chen ₁ , Zhaohua Wang ₁ , Chuan Wu _{1,

2}

Affiliation

Phosphorus-doped hard carbon nanofibers with macroporous structure were successfully synthesized by electrospinning followed by a thermal treatment process using polyacrylonitrile and H₃PO₄ as carbon and phosphorus precursors, respectively. X-ray photoelectron spectroscopy analysis reveals that the doped phosphorus atoms can incorporate into the carbon framework and most of them are connecting with carbon atoms to form P–C bond. The (002) plane interlayer spacing was taken from the X-ray diffraction pattern, which shows a large spacing of 3.83 Å for the obtained P-doped hard carbon nanofibers. When used as an anode in sodium-ion batteries, the as-prepared P-doped hard carbon nanofibers can deliver a reversible capacity of 288 and 103 mAh g^–1 at a current density of 50 mA g^–1 and 2 A g^–1, respectively. After 200 cycles at 50 mA g^–1, the capacity retention of P-doped hard carbon nanofibers still reaches 87.8%, demonstrating good cycling durability. These excellent electrochemical performances of P-doped hard carbon nanofibers can be attributed to the macroporous structure, large interlayer spacing, and the formation of P–C bond.

中文翻译：

通过静电纺丝作为钠离子电池阳极的磷掺杂硬碳纳米纤维

通过静电纺丝，然后分别使用聚丙烯腈和H ₃ PO ₄作为碳和磷的前驱体进行热处理，成功地合成了具有大孔结构的掺磷硬碳纳米纤维。X射线光电子能谱分析表明，掺杂的磷原子可以掺入碳骨架中，并且大多数磷原子与碳原子相连形成P–C键。（002）面层间距离取自X-射线衍射图，对于所获得的P-掺杂的硬碳纳米纤维而言，其显示出3.83的大间距。当用作钠离子电池的阳极时，所制备的P掺杂硬碳纳米纤维可提供288和103 mAh g ^–1的可逆容量。电流密度分别为50 mA g ^–1和2 A g ^–1。在50 mA g ^–1下进行200次循环后，掺P的硬碳纳米纤维的容量保持率仍达到87.8％，显示出良好的循环耐久性。掺P的硬碳纳米纤维的这些优异的电化学性能可归因于大孔结构，较大的层间间距和PIC键的形成。

更新日期：2018-06-04

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