锂电池用水性粘结剂中钠含量检测方法研究

Research on measurement methods for Na content in water-soluble binder for Li-ion batterys

采用原子吸收光谱法(AAS)、电感耦合等离子体发射光谱法(ICP)和X射线能谱分析法(EDS)对7种锂离子电池用水性粘结剂中钠含量进行检测,引入变异系数来对比评价3种方法对检测结果的影响并分析了原因。结果表明,AAS检测方法的变异系数<3.21%、ICP检测方法的变异系数<2.83%,这两种检测方法准确度高且重复性好,适合用于低钠含量粘结剂的检测;EDS检测方法操作简单,适合微观表面平整度好、钠含量高的水性粘结剂的钠含量检测。

The sodium concentration of 7 water-soluble binders for Li-ion battery were measured by atomic absorption spectroscopy(AAS),inductively coupled plasma atomic emission spectrometry(ICP),and X-ray energy dispersive spectrometer(EDS).The variation coefficient was introduced to compare the effects of the three methods on the measurement results.According to the experimental results,the AAS and ICP measurements are highly accurate and repeatable,with the variation coefficient of <3.21% and <2.83%,respectively.The EDS technique is easy to operate and suitable for the measurement of the samples with flat surface and high sodium content.