Effect of AlPO4 Nanowire Coating on the Electrochemical Properties of LiV3O8 Cathode Material

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• 作者：Lifang Jiao ; Li Liu ; Junli Sun ; Lin Yang ; Yanhui Zhang ; Huatang Yuan ; Yongmei Wang ; Xingdi Zhou
• 刊名：Journal of Physical Chemistry C
• 出版年：2008
• 出版时间：November 20, 2008
• 年：2008
• 卷：112
• 期：46
• 页码：18249-18254
• 全文大小：502K
• 年卷期：v.112,no.46(November 20, 2008)
• ISSN：1932-7455

文摘

In this study, AlPO₄ nanowires were coated on the surfaces of LiV₃O₈ powders successfully. The influence of the coating on the electrochemical behavior of LiV₃O₈ was discussed. The surface morphology was characterized by scanning electron microscopy (SEM) and transmission electron microscopy (TEM). AlPO₄-coated LiV₃O₈ cathode materials exhibited distinct surface morphology. AlPO₄ nanowires were clearly observed on the surfaces of LiV₃O₈. The structural changes of the cathode materials before and after coating were revealed by X-ray diffraction spectroscopy (XRD). The 1 wt % AlPO₄ coating has been found to reduce the capacity fade of LiV₃O₈ significantly. Cyclic voltammetry (CV) shows that the characteristic phase transitions during cycling exhibited by the uncoated material are suppressed by the 1 wt % AlPO₄ coating. This behavior implies that AlPO₄ inhibits structural change of LiV₃O₈ during cycling. In addition, the AlPO₄ coating on LiV₃O₈ significantly suppresses the increase of charge-transfer impedance (R_ct) in cycling. Comparative data for the coated and uncoated materials are presented and discussed.