Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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Transactions of Nonferrous Metals Society of China

Vol. 18    No. 2    April 2008

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Preparation of NaV1−xAlxPO4F cathode materials for application of sodium-ion battery
LIU Zhi-ming(刘志明)1, WANG Xian-you(王先友)1, WANG Ying(王 莹)2,TANG An-ping(唐安平)1, YANG Shun-yi(杨顺毅)1, HE Liang-fu(何亮甫)1

1. School of Chemistry, Xiangtan University, Xiangtan 411105, China;2. School of Chemical Engineering and Pharmacy, Wuhan Institute of Technology, Wuhan 430073, China

Abstract:The effects of Al doping on the electrochemical properties of NaVPO4F as a cathode material for sodium-ion batteries were investigated. Al-doped NaV1−xAlxPO4F (x=0, 0.02) samples were prepared by a simple high temperature solid-state reaction involving VPO4 and NaF for the application of cathode material of sodium-ion batteries. The crystal structure and morphology of the material were studied by Flourier-infrared spectrometry(FT-IR), X-ray diffractometry(XRD) and scanning electron microscopy(SEM). The results show that NaV1−xAlxPO4F (x=0, 0.02) has a typical monoclinic structure. The effects of Al doping on the performance of the cathode material were analyzed in terms of the crystal structure, charge-discharge curves and cycle performance. It is found that NaV0.98Al0.02PO4F shows an improved cathodic behavior and discharge capacity retention compared with the undoped samples in the voltage range of 3.0−4.5 V. The electrodes prepared from NaV0.98Al0.02PO4F deliver an initial discharge capacity of 80.4 mA∙h/g and an initial coulombic efficiency of 89.2%, and the capacity retention is 85% after 30th cycle. Though the Al-doped samples have lower initial capacities, they show better cycle performance than Al-free samples.


Key words: sodium ion battery; cathode materials; capacity retention; cycle performance

ISSN 1004-0609
CN 43-1238/TG

ISSN 1003-6326
CN 43-1239/TG

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