锂离子电池正极材料Li1+xV3O8的合成及性能研究

研究了一种新型制备锂离子电池正极材料Li_1+xV₃O₈的工艺方法.以NH₄VO₃为原料,通过淬火法制备出V₂O₅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+xV₃O₈.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.

Synthesis and Electrochemical Performance of Li1+xV3O8 as Cathode Material for Lithium Secondary Batteries

A novel technique was studied to prepare Li_1+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 Li_1+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 350℃ 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.