Design and fabrication of NaFePO_4/MWCNTs hybrid electrode material for sodium-ion battery

摘要

Watery rechargeable sodium-ion batteries are alluring as elective materials to replace conventional lithium-ion batteries for the improvement of next-generation devices due to the abundance of sodium assets. Hence, we report the NaFePO_4/MWCNT hybrid nanocomposite for high-performance cathode material for sodium-ion batteries synthesized by a facile hydrothermal route. The structural and morphological information of the products was identified through XRD, Raman and FESEM studies. The results suggest that orthorhombic crystalline structure with Pnma space group and the disk-like NaFePO_4 was consistently wrapped on the MWCNT. Furthermore, the NaFePO_4 wrapped MWCNT hybrid anode electrode show superior surface area (78 m~2/g) and pore size (12.74 nm) than bare NaFePO_4 (78 m~2/g; 43.44 nm). The electrochemical results divulge that the hybrid electrode showed outstanding stability and high specific capacitance. NaFePO_4/MWCNT hybrid electrode reached discharge capacity of 90 mAhg~(-1) at corresponding current density of 0.1 C. Still it has maintain as 98% of retention after the 100th cycles test. The EIS further hold high electrochemical nature of the NaFePO_4/MWCNT composite electrode than pristine NaFePO_4.