A Na3V2(PO4)3 cathode material for use in hybrid lithium ion batteries

• Published in: Physical chemistry chemical physics : PCCP 2013-09, Vol.15 (34), p.14357-14363
• Main Authors: Song, Weixin, Ji, Xiaobo, Pan, Chengchi, Zhu, Yirong, Chen, Qiyuan, Banks, Craig E
• Format: Article
• Language: English
• Subjects: Applied sciences; Direct energy conversion and energy accumulation; Electrical engineering. Electrical power engineering; Electrical power engineering; Electrochemical conversion: primary and secondary batteries, fuel cells; Exact sciences and technology
• ISSN: 1463-9076; 1463-9084
• DOI: 10.1039/c3cp52308j

A NASICON-structure Na 3 V 2 (PO 4 ) 3 cathode material prepared by carbothermal reduction method is employed in a hybrid-ion battery with Li-involved electrolyte and anode. The ion-transportation mechanism is firstly investigated in this complicated system for an open three-dimensional framework Na 3 V 2 (PO 4 ) 3 . Ion-exchange is greatly influenced by the standing time, for example, the 1 hour battery presents a specific capacity of 128 mA h g −1 while the 24 hour battery exhibits a value of 148 mA h g −1 with improved rate and cycling performances over existing literature reported Li-ion batteries. In the hybrid-ion system, an ion-exchange process likely takes place between the two Na(2) sites in the rhombohedral structure. NaLi 2 V 2 (PO 4 ) 3 could be produced by ion-transportation since the Na + in the Na(1) site is stationary and the three Na(2) sites could be used to accommodate the incoming alkali ions; Li x Na y V 2 (PO 4 ) 3 would come out when the vacant site in Na(2) was occupied depending on the applied voltage range. The reported methodology and power characteristics are greater than those previously reported. A novel NASICON Na 3 V 2 (PO 4 ) 3 cathode material was prepared by a carbothermal reduction method with an open three-dimensional framework which is found to exhibit improved rate and cycling performances over existing literature reported Li-ion batteries.