GB/T 23367.2-2009Methods for chemical analysis of lithium cobalt oxide - Part 2: Determination of lithium, nickel, manganese, magnesium, aluminium, iron, sodium, calcium and copper content - Inductively coupled plasma atomic emission spectrometry (English PDF)

1 Scope

This Part of GB/T 23367 specifies the method for the determination of lithium, nickel, manganese, magnesium, aluminum, iron, sodium, calcium, copper content, in lithium cobalt oxide, which is the positive electrode material for lithium ion batteries.

This Part applies to the determination of lithium, nickel, manganese, magnesium, aluminum, iron, sodium, calcium, copper content in lithium cobalt oxide, which is the cathode material of lithium ion batteries. The measurement range is as shown in Table

1.

2 Method summary

The sample is dissolved in hydrochloric acid. In the hydrochloric acid medium, according to the optimized working conditions of the instrument and the recommended analytical spectrum, the working curve method is used, to determine the content of lithium, nickel, manganese, magnesium, aluminum, iron, sodium, calcium, copper, by inductively coupled plasma atomic emission spectrometer. Among them, the lithium is determined, by using a standard solution matched with a cobalt matrix, which has a similar composition to the specimen.

3 Reagents

Unless otherwise stated, only reagents, that are confirmed to be superior grade and 18.2

Mohm·cm secondary purified water or water of equivalent purity, are used in the analysis.

3.1 Hydrochloric acid (1 + 1).

3.2 Hydrochloric acid (5 + 95).

3.3 Lithium standard storage solution: 1.00 mg/mL.

3.4 Nickel standard storage solution: 1.00 mg/mL.

3.5 Manganese standard stock solution: 1.00 mg/mL.

3.6 Magnesium standard storage solution: 1.00 mg/mL.

3.7 Aluminum standard storage solution: 1.00 mg/mL.

3.8 Iron standard storage solution: 1.00 mg/mL.

3.9 Sodium standard storage solution: 1.00 mg/mL.

3.10 Calcium standard storage solution: 1.00 mg/mL.

3.11 Copper standard storage solution: 1.00 mg/mL.

7 Calculation of analysis results

The content of the element to be tested is calculated by the mass fraction of the element to be tested, w M ; the value is expressed in %, which is calculated according to formula (1):

Where:

rhoM - The mass concentration of the tested element in the test solution, in micrograms per milliliter (µg/mL);

rho 0 - The mass concentration of the tested element in the blank solution, in micrograms per milliliter (µg/mL);

V - The total volume of the test solution, in milliliters (mL);

V 1 - The volume of the divided test solution, in milliliters (mL);

V 2 - The volume of the test solution for determination, in milliliters (mL);

m - The mass of the sample, in grams (g).

8 Tolerance

The difference, between the analysis results between laboratories, shall not be greater than the allowable difference, which is listed in Table 4 below.