磷酸亚铁锂碳复合物中锂含量的测定

Determination of Li^+ Content of LiFePO_4/C Composite

采用空气-乙炔火焰原子吸收法测定了LiFePO4/C复合物中的锂含量,考察了不加基体和加入基体的两种标准系列的回收率;因为目前还没有LiFePO4的标准样品和标准分析方法,所以实验采用模拟标准样品考察了不同酸介质和不同酸用量的影响,并进行了Fe2+、PO34-、Cr3+、Mg2+、Mn2+、Co2+、Ni2+离子对测定锂的干扰实验。通过实验得到此方法的回收率在97.25%~102.5%之间,样1、样2、样3和样4的测定结果的相对标准偏差分别为2.31%、0.81%、0.56%和0.13%。

This paper determined Li^ ＋ content of LiFePO4/C composite by air - aeetylene flame atomic absorption spectrum method, recovery rate of standard series sample with Fe^2＋ and PO4^3- and without Fe^2＋ and PO4^3- were determinated. At present, there are not standard sample and standard analytical method of LiFePO4, so this experiment use simulative standard sample to study the influence of different acid kinds and acid content to the results and study the influence of Fe^2＋ , PO4^3 - , Cr^3 ＋ , Mg^2 ＋ , Mn^2 ＋ , Co^2 ＋ , Ni^2 ＋ eontent to the results. Recovery of this method were between 97.25% and 102.5% , and relative standard deviation of determination results of sample one, sample two, sample three and sample four were respeetivly 2.31% , 0.81% , 0.56% and 0.13%.