Controllable Synthesis of Na3V2(PO4)3/C Nanofibers as Cathode Material for Sodium-Ion Batteries by Electrostatic Spinning

• Published in: Frontiers in chemistry Vol. 6; p. 617
• Main Authors: Wu, Ling, Hao, Yueying, Shi, Shaonan, Zhang, Xiaoping, Li, Huacheng, Sui, Yulei, Yang, Liu, Zhong, Shengkui
• Format: Journal Article
• Language: English
• Published: Frontiers Media S.A 10-12-2018
• Subjects: cathode materials; Chemistry; electrospinning; Na3V2(PO4)3; nanofibers; sodium-ion batteries
• ISSN: 2296-2646; 2296-2646
• DOI: 10.3389/fchem.2018.00617

Na
3
V
2
(PO
4
)
3
/C nanofibers are prepared by a pre-reduction assisted electrospinning method. In order to maintain the perfect fibrous architecture of the Na
3
V
2
(PO
4
)
3
/C samples after calcining, a series of heat treatment parameters are studied in detail. It is found that the heat treatment process shows important influence on the morphology and electrochemical performance of Na
3
V
2
(PO
4
)
3
/C composite nanofibers. Under the calcining conditions of 800°C for 10 h with a heating rate of 2.5°C min
−1
, the well-crystallized uniform Na
3
V
2
(PO
4
)
3
/C nanofibers with excellent electrochemical performances are successfully obtained. The initial discharge specific capacities of the nanofibers at 0.05, 1, and 10C are 114.0, 106.0, and 77.9 mAh g
−1
, respectively. The capacity retention still remains 97.0% after 100 cycles at 0.05C. This smooth, uniform, and continuous Na
3
V
2
(PO
4
)
3
/C composite nanofibers prepared by simple electrospinning method, is expected to be a superior cathode material for sodium-ion batteries.