겨울 심포지움
2018겨울초록
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Recently lithium secondary battery has been a hot issue as a power source for not only portable electronic devices but also electric motors. Among various cathode active materials, Li(NixCoyMnz)O2(x+y+z=1) (NCM) is one of the most prominent and representative materials for high capacity and efficiency. Since the analysis of trace elements is very important for developing efficient cathode materials of NCM, the determination of trace impurities, such as Na, Mg, etc., or additive elements, such as Al, B, etc., is often required for the improvement of quality. Among them, boron is an interesting element for high efficiency of NCM in lithium ion battery. However, boron is converted into a highly volatile complex compound, it can easily be lost during sample treatment, which makes the determination difficult.
In this work, we studied the analytical method to determine boron in NCM using ICP-MS. For higher accuracy and precision, external standard, internal standard, and the standard addition method were performed for calibration and the results were compared. The coefficients of determination (R2) for calibration curves were assessed above 0.999 and the limits of detection were as low as 0.09946 ng/mL. In addition, the uncertainty of measurement was studied for standardization, which was based on identifying, quantifying and combining all the associated sources of uncertainty separately. The contents boron in NCM sample was 0.07605% (wt. %) and the expanded uncertainties values ("±0.0000097%) " were obtained in our primitive estimation.
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