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通过对P123辅助水热法合成的样品煅烧获得LiFePO_4纳米片,其横向尺寸约为100nm。利用X射线衍射仪和扫描电镜等测试手段对制备出的样品的结构和形貌进行表征。结果表明,直接水热法制备的LiFePO_4样品是由自组装的片构成,其横向尺寸约为200nm。在N_2气氛保护和高温条件下对水热合成的样品进行煅烧后,LiFePO_4由自组装片分解为分散性良好的纳米片。由于具有纳米级尺寸和碳膜的包覆,由该LiFePO_4纳米片正极材料制作的锂离子电池具有较好的性能。
LiFePO 4 nanosheets were obtained by calcining the samples synthesized by P123 assisted hydrothermal method, and their lateral size was about 100 nm. The structure and morphology of the prepared samples were characterized by X-ray diffraction and scanning electron microscopy. The results show that the LiFePO 4 sample prepared by direct hydrothermal method is composed of self-assembled sheets with a lateral size of about 200 nm. After hydrothermally synthesized samples were calcined under N 2 atmosphere protection and high temperature conditions, LiFePO 4 was decomposed from self-assembled tablets into well-dispersed nanosheets. Due to the nano-scale size and the coating of the carbon film, the lithium ion battery made from the LiFePO 4 nanosheet cathode material has better performance.