LiFePO₄@C cathode materials synthesized from FePO₄@PAn composites

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• 作者：Ningyu Gu ; ^{nygu@ncu.edu.cn} ; Xinghua He ; Yang Li
• 关键词：Lithium ion batteries ; Cathode material ; Lithium iron phosphate ; In situ polymerization
• 刊名：Materials Letters
• 出版年：2012
• 期刊代码：59_0167577x
• 类别：ms
• 出版时间：15 August, 2012
• 卷：81
• 期：Complete
• 页码：115-118
• 文件大小：607 K

摘要

Carbon coated LiFePO₄ cathode materials were successfully synthesized by heating the precursors of FePO₄@PAn (polyaniline) and equimolar LiOH路H₂O under Ar flow. We demonstrated a method that could precisely control the carbon shell in a single reaction step. The precursors of FePO₄@PAn were prepared by in situ polymerization of aniline and precipitation of FePO₄ in one pot in the presence of hydrogen peroxide as oxidizer. In the obtained core-shell cathode composite, the LiFePO₄ core phase was crystalline while the carbon shell had the thickness of several nanometers. The optimized cathode material exhibited satisfactory rate and cycle performance, which virtues are quite suitable for power lithium ion batteries.