Synthesis of spindle-shaped nanoporous C¨CLiFePO₄ composite and its application as a cathodes material in lithium ion batteries

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• 作者：Chang  ; Su  ; ;   ; ^{suchang@zjut.edu.cn} ; Lihuan  ; Xu ; Botao  ; Wu ; Cheng  ; Zhang
• 关键词：Lithium ion battery ; LiFePO₄ ; Microstructure ; Electrochemical properties
• 刊名：Electrochimica Acta
• 出版年：2011
• 出版时间：30 November 2011
• 年：2011
• 卷：56
• 期：27
• 页码：10204-10209
• 全文大小：1197 K

文摘

In this work, LiFePO₄/C composites were prepared in hydrothermal system by using iron gluconate as iron source, and two feeding sequences during the preparation were comparatively studied. The morphology, crystal structure and charge¨Cdischarge performance of the prepared samples were characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), and galvanostatic charge¨Cdischarge testing. The results showed that the feeding sequences and iron gluconate seriously affected the microstructures and electrochemical properties of the resulting LiFePO₄ cathodes in lithium ion batteries. The spindle-shaped LiFePO₄ with hierarchical microporous structure self-assembled by nanoparticles has been successfully synthesized by synthesis route B. In addition, the cell performance of the synthesized LiFePO₄ by synthesis route B was better than that of LiFePO₄ by synthesis route A. Specially at high rates, the superior rate performance of the spindle-shaped LiFePO₄/C microstructure (LFP/C-B) was revealed. And special reversible capacities of ?18 and ?5 mAh g^? were obtained at rates of 2 C and 5 C, comparing to ?6 and ?8 mAh g^? for LFP/C-A.