In-situ One-pot Preparation of LiFePO₄/Carbon-Nanofibers Composites and Their Electrochemical Performance

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• 作者：Jiaohui  ; Zhang ; Jian  ; Xie ; Chunyang  ; Wu ; Gaoshao  ; Cao ; Xinbing  ; Zhao  ; ;   ; ^{zhaoxb@zju.edu.cn}
• 关键词：LiFePO₄/carbon-nanoflbers ; In-situ catalytic growth ; 3D conductive network ; Electrochemical performance
• 刊名：Journal of Materials Science & Technology
• 出版年：2011
• 出版时间：November 2011
• 年：2011
• 卷：27
• 期：11
• 页码：1001-1005
• 全文大小：666 K

文摘

A novel in-situ route was employed to synthesize LiFePO₄/carbon-nanofibers (CNFs) composites. The route combined high-temperature solid phase reaction with chemical vapor deposition (CVD) using Fe₂O₃ and LiH₂PO₄ as the precursors for LiFePO₄ growth and acetylene (C₂H₂) as the carbon source for CNFs growth. The composites were characterized by X-ray diffraction (XRD), Brunauer-Emmett-Teller (BET) specific surface area, field emission scanning electron microscopy (FE-SEM), and transmission electron microscopy (TEM). The electrochemical performance of the composites was studied by galvanostatic cycling and cyclic voltammetry (CV). The results showed that the in-situ CNFs growth could be realized by the catalytic effect of the Fe₂O₃ precursor. The sample after 80 min CVD reaction showed the best electrochemical performance, indicating a promising application in high-power Li-ion batteries.