Self-Assembled LiFePO4/C Nano/Microspheres by Using Phytic Acid as Phosphorus Source

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• 作者：Jing Su ; Xing-Long Wu ; Chun-Peng Yang ; Jong-Sook Lee ; Jaekook Kim ; Yu-Guo Guo
• 刊名：The Journal of Physical Chemistry C
• 出版年：2012
• 出版时间：March 1, 2012
• 年：2012
• 卷：116
• 期：8
• 页码：5019-5024
• 全文大小：396K
• 年卷期：v.116,no.8(March 1, 2012)
• ISSN：1932-7455

文摘

A general and efficient hydrothermal strategy combined with a high-temperature carbon-coating technique has been developed for large scale synthesis of self-assembled LiFePO₄/C nano/microspheres employing the biomass of phytic acid as a novel and eco-friendly phosphorus source. The LiFePO₄/C nano/microspheres are investigated by SEM, TEM, EDS, XRD, Raman spectroscopy, and electrochemical techniques. A reasonable assembly process of the hierarchical structure is proposed on the basis of time-dependent experimental results. Because of the unique structure, the LiFePO₄/C nano/microspheres show a high tap density of 1.2 g cm^鈥?, a high reversible specific capacity of 155 mA h g^鈥? at 0.1 C, as well as excellent rate capability and cycling performance, exhibiting great potential as superior cathode materials in lithium ion batteries. The approach for the preparation of LiFePO₄ by using PA as the phosphorus source may open new prospects for utilization of biomass to produce high performance cathode materials for lithium ion batteries.