CAJ | 학술논문

以市售FoPO_4·2 H_2O为原料,利用正交实验方法优化碳热还原法制备LiFePO_4/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16 h,原料摩尔比2∶1∶2.5.按最佳工艺合成的样品0.2 C与1 C时的最大放电比容量可达151.4、141.2mAh/g,振实密度可达1.4 g/cm~3,且表现出良好的循环稳定性.
이시수FoPO_4·2 H_2O위원료,이용정교실험방법우화탄열환원법제비LiFePO_4/C복합정겁재료적합성공예,고찰합성온도、원료마이비급보온시간등인소대재료형모급전화학성능적영향,득도최가공예조합:합성온도650℃,보온시간16 h,원료마이비2∶1∶2.5.안최가공예합성적양품0.2 C여1 C시적최대방전비용량가체151.4、141.2mAh/g,진실밀도가체1.4 g/cm~3,차표현출량호적순배은정성.
The orthogonal experiment [L_9(3~3)] was designed to determine the optimal synthesis techniques of LiFePO_4/C composite prepared by one-step solid-state reaction using FePO_4·2 H_2O as raw material. The effects of synthesis temperature, time, and the molar ratio of raw materials on the morphology and electrochemical performance of LiFePO_4/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/cm~3.