Synthesis and characterization of LiFePO₄/(C + Fe₂P) composite cathodes

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• 作者：Hui Liu ; Jingying Xie ; Ke Wang
• 关键词：LiFePO₄ ; Fe₂P ; Conductive webs ; Li-ion batteries
• 刊名：Solid State Ionics
• 出版年：2008
• 出版时间：30 September 2008
• 年：2008
• 卷：179
• 期：27-32
• 页码：1768-1771
• 全文大小：609 K

文摘

LiFePO₄/(C + Fe₂P) composite cathode with composite conductive webs structure was synthesized by modified carbothermal reduction method from the amorphous gel precursor at a heat-treatment temperature of 700 °C. The composite material exhibits an improved discharge capacity. Discharge capacities at 1 C rate were improved from 121.4 mAh g^− 1 of LiFePO₄/C to 140.8 mAh g^− 1 of LiFePO₄/(C + Fe₂P) composite materials synthesized by two different routes using the same gel precursor, which could be, at least in part, attributed to the improved conductivity through the in situ formed Fe₂P phase by the method. Electrochemical impedance measurements show that coexistence of the carbon and Fe₂P phase with LiFePO₄ could decrease the charge transfer resistance and increase surface electronic conductivity of the LiFePO₄/(C + Fe₂P) composite cathode.