中文摘要：

采用二步反应的方法制备了核壳结构的LiFePO4／C纳米复合锂离子电池正极材料，这种方法包括聚苯胺包覆的FePO4前驱体的制备和在碳源材料存在下高温焙烧。聚苯胺的初始包覆能够有效地防止FePO4在高温下进一步生长，有利于制备纳米尺寸的LiFePOEC纳米复合物。碳源材料的类型对所得LiFePO4／C的颗粒尺寸，形貌，电化学性能具有十分明显的影响。以蔗糖为碳源合成的LiFePO4／C材料具有较小的颗粒尺寸、较高含量的均匀的表面碳包覆层。并显示出最佳的电化学性能。

英文摘要：

Nano-sized LiFePO4/C with a core/shell structure was prepared by a two-step procedure, which involved the synthesis of FePO4/polyaniline （PANI） and subsequent thermal calcination in the presence of carbon sources. An initial coating of PANI on FePO4 could protect LiFePO4 nanopaticles from further growth, facilitating the fabrication of the nano-sized LiFePO4/C nanocomposites. Carbon sources, such as sucrose, polyethylene glycol or conductive carbon black, were found to have great effects on size, shape and electrochemical performance of LiFePO4/C nanocomposites. LiFePO4/C nanocomposites fabricated with sucrose as carbon source have relatively uniform sizes and higher contents of carbon, and exhibit the superior electrochemical performance.