微波合成锂电池正极材料LiFePO4电化学性能

采用微波合成技术合成锂离子蓄电池正极材料LiFePO4,通过X射线衍射(XRD),电子扫描电镜(SEM)和恒电流充放电实验,研究了在一定微波功率下合成时间对材料性能的影响。结果表明,作为微波吸收体的活性碳,升温时氧化产生的还原气氛能有效防止Fe2 的氧化,制备出单相纯净的LiFePO4。当合成时间为14min时,采用0.25C进行充放电,材料比容量可以达到96mAh/g,与固相高温合成材料的比容量性能相当。

Electrochemical performance of LiFePO4 synthesized by microwave processing as lithium battery cathode

LiFePO4 cathode materials were synthesized by microwave processing with a domestic microwave oven. The materials were characterized by powder X-ray diffraction and scanning electron microscopy. The electrochemical performance of samples after different time heating at constant microwave power was studied by constant current charge-discharge experiment. Results indicate: the activate carbon as the heat source can make reductive atmosphere prevent the oxidation of Fe2 . Pure LiFePO4 material can be prepared without reductive gas flow. The resultant products irradiated for 14 min exhibite a high reversible specific capacity of 96 mAh/g at 0.25 C, which is equivalent to the samples synthesized by solid-state reaction.