YS/T 1263.3-2018 in English

Technical Background of the Standard

This standard, part 3 of the YS/T 1263 series, focuses on the determination of lithium content in lithium nickel cobalt aluminum oxide, a core cathode material for lithium batteries, filling a gap in standards for new energy material testing in the nonferrous metals industry. With the explosive growth of the new energy industry in 2018, accurate determination of lithium content has become a critical step in quality control.

Detailed Principle of the Method

Utilizing flame atomic absorption spectrometry, the sample is digested with nitric acid and hydrogen peroxide. The lithium element is atomized in a high-temperature flame, and the ground-state atoms absorb a characteristic spectral line at 670.8 nm, whose absorbance is proportional to the lithium concentration. This method features a low limit of detection (0.09 μg/mL) and a wide linear range.

Key instrument parameters

Key Operational Points Analysis

Precision control

Precision requirements specified in the standard:

• Repeatability limit (r): 0.08% at 7.20% content, 0.12% at 7.56% content
• Reproducibility limit (R): 0.16% at 7.56% content

In practical applications, it is recommended to monitor long-term precision through control charts.

Implementation Recommendations

1. Laboratories should regularly verify the energy stability of hollow cathode lamps
2. Each batch of tests must include standard materials for quality control
3. Pay attention to interference from coexisting elements and use the standard addition method when necessary.