FePO_4为原料碳热还原法合成LiFePO_4/C工艺的优化  

Optimal synthesis techniques of LiFePO_4/C composite prepared by carbothermal reduction using FePO_4 as raw material

作　　者：张敬捧[1] 王丽[1] 梁广川[1] 崔军燕[1] 郅晓科[1] 

机构地区：[1]河北工业大学能源与环保材料研究所,天津300130

出　　处：《电源技术》2009年第8期675-678,共4页Chinese Journal of Power Sources

摘　　要：以市售FePO4·2H2O为原料,利用正交实验方法优化碳热还原法制备LiFePO4/C复合正极材料的合成工艺,考察合成温度、原料摩尔比及保温时间等因素对材料形貌及电化学性能的影响,得到最佳工艺组合:合成温度650℃,保温时间16h,原料摩尔比2∶1∶2.5。按最佳工艺合成的样品0.2C与1C时的最大放电比容量可达151.4、141.2mAh/g,振实密度可达1.4g/cm3,且表现出良好的循环稳定性。The orthogonal experiment [L9 （3^3）] was designed to determine the optimal synthesis techniques of LiFePO4/C composite prepared by one-step solid-state reaction using FePO4·2 H2O as raw material. The effects of synthesis temperature, time, and the molar ratio of raw materials on the morphology and electrochemical performance of LiFePO4/C were systematically investigated to optimize the synthesis techniques. The results showed that the optimal techniques were as follows： synthesis temperature 650 ℃, time 16 h, the molar ratio of raw materials 2 ： 1 ： 2.5. The as-prepared optimal sample showed maximum discharge capacities of 151.4 and 141.2 mAh/g at 0,2 C ＆ 1 C rate, respectively, with good cycling stability. The top density could reach 1.4 g/cm3.

关 键 词：LIFEPO4 FEPO4 正交实验 工艺优化 

分 类 号：TM912.9[电气工程—电力电子与电力传动]