锂离子电池正极材料Li_(1+x)V_3O_8的合成及性能研究

Synthesis and Electrochemical Performance of Li_(1+x)V_3O_8 as Cathode Material for Lithium Secondary Batteries

研究了一种新型制备锂离子电池正极材料Li_(1+x)V_3O_8的工艺方法.以NH_4VO_3为原料,通过淬火法制备出V_2O_5溶胶,加入LiOH溶液后,通过喷雾干燥法制备球形前驱体,再通过一定的热处理即制得锂离子电池正极材料Li_(1+x)V_3O_8.试验中,进行了前驱体的DTA/TGA分析;对产物进行了XRD、SEM及电化学性能测试研究.结果表明,经过350℃热处理24h后得到的样品颗粒细小、呈球形、粒径分布均匀、结晶度好,并且还表现出很好的电化学性能,其首次放电比容量高达378mAh·g^(-1),经过10次充放电循环后,其放电比容量为312mAh·g^(-1).

A novel technique was studied to prepare Li1+xV3O8 as cathode material for lithium secondary batteries. V2O5 sol was prepared via a ' quencher ' method by NH4VO3 as raw material. Then it was mixed with LiOH solution. The spherical precursor was obtained by a spray drying method. The Li1+xV3O8 powders were synthesized by sintering the spherical precursor. DTA/TGA were employed to analyze the precursor. The investigation of XRD, SEM and the determination of the electrochemical properties show the particles obtained by sintering at 350degreesC for 24h are fine, spherical, narrowly distributed and well crystallized. The resultant material also has excellent electrochemical properties with an initial discharge specific capacity of 378 mAh.g(-1) and the discharge specific capacity of the 10th cycle is 312mAh.g(-1).