论文部分内容阅读
以FeSO4(7H2O、H3PO4和LiOH(H2O为原料,采用水热法合成了纯相、结晶度高的磷酸亚铁锂,使用XRD、SEM和TEM技术表征了样品。结果表明:反应温度为180～190℃、反应时间为3～5h时可以得到分散性好、粒径为2～4μm的磷酸亚铁锂粉体。采用一步法和两步法对磷酸亚铁锂进行石墨烯掺杂改性,两步法优于一步法,两步法是将自制的磷酸亚铁锂粉体、氧化石墨粉体和水合肼按比例混合在一起,经100℃油浴加热24h即可得到石墨烯掺杂改性磷酸铁亚锂的复合材料,此材料仍然具有橄榄石型晶体结构,结晶度好且无杂质生成。
The samples were characterized by XRD, SEM and TEM with FeSO4 (7H2O, H3PO4 and LiOH (H2O) as raw materials and hydrothermal synthesis of pure lithium phosphate with high crystallinity. The results showed that the reaction temperature was 180 ~ 190 ℃, the reaction time is 3 ~ 5h can get good dispersion, particle size of 2 ~ 4μm lithium iron phosphate powder by one-step and two-step method of lithium iron phosphate graphene doping modification, The two-step method is superior to the one-step method. The two-step method is that the homemade lithium iron phosphate powder, the graphite oxide powder and the hydrazine hydrate are mixed in proportion and heated at 100 ° C. for 24 hours to obtain the graphene doping Lithium iron phosphate composite, this material still has an olivine-type crystal structure, good crystallinity and no impurities generated.