用不同碳源对LiFePO$_{4}$的碳包覆改性

材料研究学报, 2009, 23(4): 369-374.

用不同碳源对LiFePO$_{4}$的碳包覆改性

曹小卫张俊喜颜立成宋启云李雪

1.1.上海电力学院电化学研究室上海高校电力腐蚀控制与应用电化学重点实验室上海 2000902.上海大学环境与化学工程学院上海 2000723.杭州师范大学教务处杭州 310036>

1.1.Electrochemical Research Group

Shanghai University of Electric Power

Shanghai 2000902.School of Environmental and Chemical Engineering

Shanghai 200072\par3.Hangzhou Teachers University

Hangzhou 310036>

基金项目: 教育部科技研究重点项目205055、中国航天科工集团支撑技术基金DL01-2004、上海市重点学科建设基金P1304和上海市科委研发基地专项基金06DZ22010资助项目.

关键词：无机非金属材料 , lithium iron phosphate , co-precipitation method , carbon-coating in suit , carbonation

On the modification of the carbon-coated LiFePO₄ materials by different carbon sources

CAO Xiaowei ZHANG Junxi YAN Licheng SONG Qiyun LI Xue

Keywords： inorganic non-metallic materials , 磷酸铁锂 , 共沉淀 , 原位碳包覆 , 碳化

采用共沉淀方法结合原位碳包覆合成了LiFePO₄/C复合正极材料. 对碳化过程和包覆LiFePO₄进行了研究. 结果表明: 在不同碳源的热解过程中, 由于分子量和结构的不同, 分解温度和碳化产物的结构也不相同; 不同碳源的碳包覆对LiFePO₄的晶体结构有一定的影响, 而且由于碳包覆层结构的差异所包覆改性的LiFePO₄表现出不同的电化学性能. 文中还讨论了不同碳源对碳包覆后LiFePO₄/C的电化学性能的影响.

This study was concerning the carbonation and modification of carbon coating method of LiFePO₄. The structure and the electrochemical performance were characterized by TG-DTA, XRD, TEM and electrochemical performance testing. The results showed that different molecular weights and structures of the carbon sources resulted in different decomposition temperatures and structures of carbonized products, and the electrochemical performance of the LiFePO₄/C composite materials was effected by different carbon sources also.

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