Determination of sodium in ternary cathode material (LiNi1-x-yCoxMnyO2) for lithium ion battery by inductively coupled plasma atomic emission spectrometry
OUYANG Xi, CHEN Zhen-hua, ZHENG Xue-qin
Jiangxi Jiangte Lithium Ion Battery Material Co.,Ltd., Yichun 336000, China
Abstract：The sodium ions in ternary cathode material (LiNi1-x-yCoxMnyO2) for lithium ion battery would replace lithium ions, thus reducing the electricity capacity of materials. Therefore, the content of sodium in cathode material must be strictly controlled. In this study, the content of impurity sodium in ternary cathode material (LiNi1-x-yCoxMnyO2) for lithium ion battery was determined by inductively coupled plasma atomic emission spectrometry (ICP-AES). The effect of sample dissolution method, the concentration of hydrochloric acid in testing medium, the sample mass and the instrumental parameters was investigated. The analysis method of sodium in LiNi1-x-yCoxMnyO2 was established. The complicated operation procedures such as matrix matching or the addition of ionization buffer were not required in this method. The determination results were accurate and stable. The recoveries were between 97.8% and 103.6%, and the relative standard deviation (RSD) was less than 2.5%, which could meet the analysis requirements of ternary cathode materials.
