The preparation of NaV1-xCrxPO4F cathode materials for sodium-ion battery

• Published in: Journal of power sources Vol. 160; no. 1; pp. 698 - 703
• Main Authors: HAITAO ZHUO, XIANYOU WANG, ANPING TANG, ZHIMING LIU, GAMBOA, Sergio, SEBASTIAN, P. J
• Format: Journal Article
• Language: English
• Published: Lausanne Elsevier Sequoia 01-09-2006
• 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; Stability; Cathode; Cr doping; Doping; Secondary cell; High temperature; Electric batteries; Discharge charge cycle; Infrared spectrometry; Capacity retention; Sodium ion battery; Capacity; Morphology; Preparation; Solid state reaction; Sodium ion; Sodium Vanadium Chromium Fluophosphates; Infrared spectrum; X ray diffractometry; Performance; Cathode materials; NaV1-xCrxPO4F; Crystalline structure
• ISSN: 0378-7753; 1873-2755
• DOI: 10.1016/j.jpowsour.2005.12.079

The key to development of sodium-ion battery is the preparation of cathode/anode materials. Cr doped NaV1-xCrxPO4F (x=,0.0,0.08) were prepared by the high temperature solid-state reaction for the application of cathode material of sodium-ion batteries. The structures and morphologies of the cathode materials were characterized by Flourier-infrared spectra (FT-IR), X-ray diffraction (XRD) and scanning electron microscope (SEM). The effects of Cr doping on performances of the cathode materials were analyzed in terms of the crystal structure, charge-discharge curves and cycle performances. The results showed that the as-prepared Cr-doped materials have a better cycle stability than the un-doped one, an initial reversible capacity of 83.3mAhg-1 can be obtained, and the first charge-discharge efficiency is about 90.3%. In addition, it was also observed that the reversible capacity retention of the material is still 91.4% in the 20th cycles.