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以FePO_4·2H_2O、LiOH·H_2O、淀粉为原料,采用湿法球磨-喷雾干燥-碳热还原法制备出纳/微结构LiFePO_4/C复合材料,通过XRD、SEM测定了LiFePO_4/C复合材料的形态结构,考察了焙烧温度、焙烧时间对纳/微结构LiFePO_4/C形态和电化学性能的影响。结果表明:最佳的焙烧温度为650℃、焙烧时间为8.5 h,该条件下所得的LiFePO_4/C复合材料10 C放电比容量为123.0 mA·h/g,100次循环后放电比容量的保持率接近100%。
LiFePO 4 / C composites were prepared by wet ball milling-spray-drying-carbothermal reduction method using FePO 4 · 2H 2 O, LiOH · H 2 O and starch as raw materials. The morphology of LiFePO 4 / C composites was characterized by XRD and SEM The effects of calcination temperature and calcination time on the morphology and electrochemical performance of nano / microstructures LiFePO 4 / C were investigated. The results show that the best specific calcination temperature is 650 ℃ and the calcination time is 8.5 h. The 10 C discharge capacity of the obtained LiFePO 4 / C composite is 123.0 mA · h / g, and the specific discharge capacity is maintained after 100 cycles Rate close to 100%.