Ultrafine NaTi2(PO4)3 Nanoparticles Encapsulated in N-CNFs as Ultra-Stable Electrode for Sodium Storage

Sicen Yu; Yi Wan; Chaoqun Shang; Zhenyu Wang; Liangjun Zhou; Jianli Zou; Hua Cheng; Zhouguang Lu

doi:10.3389/fchem.2018.00270

Ultrafine NaTi₂(PO₄)₃ Nanoparticles Encapsulated in N-CNFs as Ultra-Stable Electrode for Sodium Storage

Front Chem. 2018 Jul 6:6:270. doi: 10.3389/fchem.2018.00270. eCollection 2018.

Authors

Sicen Yu¹, Yi Wan¹, Chaoqun Shang¹, Zhenyu Wang¹, Liangjun Zhou¹, Jianli Zou¹, Hua Cheng¹, Zhouguang Lu¹

Affiliation

¹ Department of Materials Science and Engineering, Southern University of Science and Technology, Shenzhen, China.

Abstract

We present a feasible method for the preparation of one-dimensional N-doping carbon nanofibers encapsulated NaTi₂(PO₄)₃ (NTP-NCNFs) through electrospinning accompanied by calcination. The poor electrical conductivity of NTP is significantly improved and the as-prepared NTP-NCNFs exhibit stable and ultrafast sodium-storage capability. The NTP-NCNFs maintains a stable specific capacity of 121 mAh g^-1 at 10 C after 2,000 cycles, which only drop to 105 mAh g^-1 after 20,000 cycles. Furthermore, the NTP-NCNFs show excellent rate performance from 0.2 to 20 C, whose recovery efficiency still reaches 99.43%. The superior electrochemical property is mainly attributed to the large specific surface area, high porosity, N-doping carbon coating, and one-dimensional structure of NTP-NCNFs.

Keywords: N-doping carbon nanofibers; NTP; cycling performance; electrospinning; sodium-storage.