中间相碳/Co复合微球的制备

PREPARATION OF MESOCARBON/Co COMPOSITE MICROBEADS

以煤沥青和乙酸钴为原料进行热缩聚反应,以吡啶为溶剂,分离制备出大小为20μm左右的中间相碳/Co复合微球,并研究了钴含量和热处理温度对复合微球结构的影响。研究结果表明,随着原料中乙酸钴含量的增加,制备出的复合微球钴含量增加。复合微球的X衍射图显示出明显的石墨碳和金属钴的衍射峰,2500℃石墨化后,复合微球中的钴仍能稳定存在。热处理过程中复合微球中钴对碳的石墨化有催化作用,钴含量越大,这种催化石墨化作用越明显。复合微球的TEM照片显示微球中钴颗粒大小为10～40nm,颗粒均匀分布在中间相碳基质中。

Recently, carbon/metal composites have drawn immense interests due to their remarkable properties and their promising applications as electrode materials. In the present study, mesocarbon/Co composite microbeads with a size of about 20μm were prepared by pyrolysis of the mixture of coal tar pitch and cobalt acetate and then extraction with pyridine. The effects of Co content and heat treatment on the structure of composite microbeads have been investigated. The results show that the content of Co metal in composite microbeads increases with the increasing of the ratio of cobalt acetate to coal tar pitch in the starting material The XRD studies show obvious diffraction peaks associated with graphitic carbon and Co metal Co particles in the composite are stable even at 2 500 ℃ in inert atmosphere. Furthermore, it has been found that Co particles have catalytic effect on the graphitization of carbon, which becomes obvious with the increase of Co content in composite microbeads. The transmission electron microscope study reveals that nano - sized Co particles are dispersed in carbon matrix.