LiCoPO4中碳与Co2P杂质含量的确定

摘要

A method to analyze the content of carbon and cobalt phosphide(Co2P) impurities in lithium cobalt phosphate(Li-CoPO4) by acid leaching to dissolve LiCoPO4 was presented. The results of XRD analysis showed that the product was Co2P phase after leached by dilute HQ, the product was carbon material after leached by dilute HNO3. The content of carbon in synthesized Ii-CoPO4/C composite was 5.4%, the content of Co2P impurity was 5.3% by the determination with the mentioned method. The particle size of Synthesized sample was about 0.5μm,the 0.2 C specific discharge capacity was 75 mAh/gd(LiCoPO4+Co2+P+C).%提出用酸淋洗溶解磷酸钴锂( LiCoPO4),测定橄榄石型LiCoPO4中杂质碳和磷化钴(Co2P)含量的方法.XRD分析结果表明:稀盐酸淋洗后的产物是Co2P相,硝酸淋洗后的产物是碳材料.用上述方法确定了合成的LiCoPO4/C复合材料中,碳含量为5.4％,Co2P杂质的含量为5.3％.合成的样品粒度约为0.5μm,0.2C放电比容量为75 mAh/g(LiCopo4+Co2P+C).