摘要
以黄磷所得副产品磷铁为原料,通过湿法溶解、除杂、结晶等工艺制备电池级磷酸铁,然后利用制备出的磷酸铁制备磷酸铁锂。制备电池级磷酸铁的最佳工艺参数为:硝酸浓度为3.0 mol/L、最佳反应温度为110℃、最佳反应时间为120 min、反应体系铁质量浓度为18.0 g/L,此时样品中铁含量与铁磷比接近理论值。LiFePO_(4)/C样品首次充电容量、放电容量、放电的库伦效率分别为158.8 mAh/g、147.8 Ah/g、93.1%,说明磷酸铁锂电化学性能较好,能用于锂电池的正极材料。
The battery grade Iron(III)phosphate was prepared by wet dissolution,impurity removal,crystallization and other processes with the by-product of yellow phosphorus as raw material,and then lithium iron phosphate was prepared from the prepared iron phosphate.The optimal process parameters for preparing battery grade iron(III)phosphate are:nitric acid concentration is 3.0 mol/L,the optimal reaction temperature is 110℃,the optimal reaction time is 120 min,and the iron mass concentration of the reaction system is 18.0 g/L.At this time,the iron content in the sample and the iron phosphorus ratio are close to the theoretical value.The first charge capacity,discharge capacity and discharge coulomb efficiency of LiFePO4/C sample are 158.8 mAh/g,147.8 Ah/g and 93.1%respectively,which indicates that Lithium iron phosphate has good electrochemical performance and can be used as cathode material of lithium battery.
作者
李珍珍
Li Zhenzhen(LB Group Co.,Ltd.,Jiaozuo Henan 454006,China)
出处
《山西化工》
CAS
2023年第7期1-2,10,共3页
Shanxi Chemical Industry
关键词
水热法
磷铁
磷酸铁
磷酸铁锂
hydrothermal method
phosphate iron
iron(III)phosphate
lithium iron phosphat