【摘要】 采用Pechini预燃烧法制备锂离子蓄电池正极材料尖晶石型LiNi0.5Mn1.5O4,将生成的聚合物前驱体在开放的空气中点燃,燃烧后的粉料在550～850℃中焙烧8h得到最终产物。研究了焙烧温度以及冷却速度对合成产物组成结构以及电化学性能的影响。结果表明在600℃焙烧8h,冷却速度为0.5℃/min,所得试样的电化学性能最好:在4.7V时,首次充放电容量为103mAh/g和100mAh/g,15次循环放电容量保持95.2%;在3.0V时,首次充放电容量为145mAh/g和134mAh/g,15次循环放电容量保持91.5%;2.6～4.9V范围内总的充放电容量为250mAh/g和242.5mAh/g,15次循环放电容量保持88.4%。更多还原

【Abstract】 Spinel LiNi0.5Mn1.5O4, as the cathode material for Liion battery, was synthesized by means of Preignited Pechini process. The precursors were preignited in open air and then were calcined in the temperature range of 550-850 ℃ for 8 h to obtain the final product. Effects of calcining temperature and cooling rate on composition, structure and electrochemical properties were researched. The results show that the sample calcined at 600 ℃ for 8 h and cooled at 0.5 ℃/min has the optimal electrochemical property. That is, in 4.7 V range, its initial charge and discharge capacity is 103 mAh/g and 100 mAh/g while the discharge capacity in the 15 th cycle is 95.2% of the initial value; in 3.0 V range, its initial charge and discharge capacity is 145 mAh/g and 134 mAh/g while the discharge capacity in the 15 th cycle is 91.5% of the initial value; in 2.6-4.9 V range its initial charge and discharge capacity is 250 mAh/g and 242.5 mAh/g while the discharge capacity in the 15 th cycle is 88.4% of the initial value.更多还原