非晶态磷酸铁的沉淀反应机理及性能

Precipitation reaction mechanism and performance of amorphous ferric phosphate

采用微反应器合成正极材料纳米磷酸铁（Fe PO4）,对样品进行分析,并研究沉淀反应的机理。微反应器能将Fe PO4的颗粒尺寸控制在20-30 nm,同时非晶态Fe PO4的电化学性能较好。以0.1 C的电流在4.2-2.5 V充放电,前驱体以及在350℃、400℃、450℃、500℃焙烧样品的首次放电比容量分别为115.0 m Ah/g、99.5 m Ah/g、82.5 m Ah/g、63.5 m Ah/g和41.0 m Ah/g;以科琴黑作为导电剂,采用400℃下焙烧制备的Fe PO4组装电池,首次放电比容量达140.0 m Ah/g,循环30次的容量保持率为78.2%。

Cathode material nano ferric phosphate （FePO4）was synthesized by micro-reactor and the precipitation reaction mechanism was studied. The prepared samples were characterized. The amorphous FePO4 was controlled in a narrow particle size distribution of 20 - 30 nm and the amorphous FePO4 showed better electrochemical performance. When charged-discharged in 4. 2 - 2. 5 V with the current of 0. 1 C, the specific discharge capacity of precursor and the samples sintered at 350 ℃, 400 ℃, 450 ℃, 500 ℃ was 115.0 mAh/g,99. 5 mAh/g,82. 5 mAh/g,63.5 mAh/g and 41.0mAh/g,respectively. The cell using Ketjen black as conductive agent and assembled with FePO4 prepared by sintered at 400 ℃ had the initial specific discharge capacity of 140.0 mAh/g,the capacity retention was 78. 2% after 30 cycles.