LaFeO_3电极材料的制备和电化学性能  

Preparation and Electrochemical Property of LaFeO_3 Electrode Material

作　　者：邓刚[1] 陈云贵[1] 陶明大[1] 吴朝玲[1] 沈向前[1] 羊恒[1] 朱丁[1] 

机构地区：[1]四川大学材料科学与工程学院,成都610064

出　　处：《化学学报》2009年第17期2001-2004,共4页Acta Chimica Sinica

摘　　要：利用硬脂酸燃烧法制备了具有正交结构的LaFeO3粉末,研究了作为Ni/MH电池的负极材料的电化学性能.研究结果表明:LaFeO3具有充放电可逆电化学容量,其放电容量随实验温度升高而增大,随放电电流增大而减小;在充放电温度为298,313,333和353K条件下,经20次循环后,XRD显示LaFeO3仍然保持钙钛矿结构,容量分别保持在49,110,310和490mAh·g-1左右,显示了良好的循环稳定性.计算所得的交换电流密度和离子扩散系数随温度升高而增大,与放电容量的变化规律一致.LaFeO3 powders with an orthorhombic structure were prepared by a stearic acid combustion method, and its electrochemical properties were investigated as the negative electrode of Ni/MH batteries. The results show that the LaFeO3 has a reversible charge-discharge capacity, and its discharge capacity rises with the test temperature increasing and decreases with increasing discharge current density. At 298, 313, 333 and 353 K, after 20 cycles, XRD data show that the LaFeO3 remains a perovskite-type structure and the discharge capacity keeps about 49, 110, 310 and 490 mAhog-1 respectively, indicating a good cycling stability. Exchange current density and ion diffusion coefficient rose as the temperature increased, in line with the changes of the discharge capacity of LaFeO3.

关 键 词：镍氢电池 阳极材料 LAFEO3 电化学性能 

分 类 号：O614.331[理学—无机化学] TM912.2[理学—化学]