成核剂对中间相炭微球性能的影响

Effects of Nucleating Agent on Properties of Mesocarbon Microbeads

以煤液化沥青为原料,炭黑、石油焦、石墨和针状焦为成核剂,在410℃恒温5h条件下,采用热聚合法制备中间相炭微球,并研究四种成核剂在相同热处理条件下得到的中间相炭微球,作为锂离子电池负极材料的性能.结果表明:以炭黑和石墨为成核剂可以制备得到粒度分布均匀、表面形貌较好的中间相炭微球.由电性能测试结果可知,首次可逆容量和首次效率分别为353.9mAh/g与92.9%和346.5mAh/g与92.6%.对比商品化中间相炭微球指标,发现以炭黑和石墨为成核剂制备得到的中间相炭微球,其性能与国内同类产品的性能相近.

Mesocarbon microbeads were prepared by thermal polymerization using coal liquefaction pitch as raw materials and carbon black,petroleum coke,graphite and needle coke as nucleating agents at 410 ℃ for 2h.The properties of mesocarbon microbeads as negative electrode material for lithium ion battery were studied.Results show that with carbon black and graphite as nucleating agent,the mesocarbon microbeads with uniform particle size distribution and good surface morphology can be prepared.The results of electrical performance tests show that the initial reversible capacity and the initial efficiency of mesocarbon microbeads are 353.9mAh/g,92.9% and 346.5mAh/g,92.6% respectively.Compared with the similar products in the domestic market,the mesocarbon microbeads prepared by carbon black and graphite as the nucleating agent are similar to those of similar products in China.