不同碳源对批量制备磷酸铁锂的影响

Effect of different kinds of carbon sources on mass production of LiFePO_4

关注了工业化固相法制备磷酸铁锂(LiFePO4)正极材料过程中,三种常规的含有碳环有机碳源(淀粉、蔗糖、葡萄糖)对喷雾前驱体形貌及磷酸铁锂正极材料性能的影响。SEM结果表明,淀粉、葡萄糖为碳源喷雾出来的前驱体具有较高的黏性,电化学性能测试表明蔗糖为碳源制备的材料随着放电倍率从0.1C至5C的增加容量衰减最慢,约30%,表明蔗糖这种碳源较适合倍率性电池正极材料;葡萄糖为碳源制备的LiFePO40.1C时放电比容量最高,约157mAh/g,接近理论容量的92%,表明葡萄糖这种碳源较适合容量性电池正极材料。

resently, researches were carried out on the effects of three kinds of carbon sources, including starch, sucrose, and glucose, on the shape appearances and performance of phosphate i- ron lithium cathode material during the industrialized-scale solid phase making processing. Scan- ning electrical microscopic （SEM） observations showed that the precursor particles sprayed from the slurry are mono-dispersed, on the contrary, the particles synthesized from the carbon source of sucrose and glucose are assembled together. Electrochemical measurements illustrated that the capacity attenuation of phosphate iron lithium cathode materials prepared by carbon source of starch was lowest under the discharge-rate range of 0.1 C to 0.5 C, which indicated the phos- phate iron lithium cathode materials starch-carbon-source precursor adapted to the development of rate-type lithium. Additionally, phosphate iron lithium cathode materials fabricated from the condition of glucose employed as the carbon source precursor had a capacity of 157 mAh/g during discharging at 0.1 C, close to 92% of the theoretical value, indicating that carbon source of glu- cose was more suitable for high- capacity material.