YS/T 1006.1-2014Methods for chemical analysis of lithium nickel cobalt manganese oxide. Part 1: Determination the total of nickel cobalt manganese content. EDTA disodium salt titration (English PDF)

1 Scope

This Part of YS/T 1006 specifies the method for the determination of the total content of nickel, cobalt and manganese in lithium nickel cobalt manganese oxide, which is the cathode material for lithium ion batteries.

This Part is applicable to the determination of the total content of nickel, cobalt and manganese in lithium nickel cobalt manganese oxide, which is the cathode material for lithium ion batteries. The range of determination is 57.00% ~ 61.00%.

2 Method Summary

Use hydrochloric acid to dissolve the specimen. In an alkaline solution with a pH value of 9 ~ 10, use murexide as an indicator; use EDTA standard titration solution to titrate it, until it turns fuchsia. In accordance with the volume of the consumed EDTA standard titration solution, calculate the total content of nickel, cobalt and manganese.

3 Reagents

Unless it is otherwise specified, only reagents that are confirmed to be analytically pure, and Grade-2 (and above) water are used in the analysis.

3.1 Murexide indicator: take 0.4 g of murexide; add 50 g of potassium sulfate; in a mortar, thoroughly grind it into fine powder.

3.2 Hydrochloric acid (1 + 1).

6 Calculation of Analysis Result

In accordance with Formula (2), calculate the mass fraction w(Ni + Co + Mn) of the total content of nickel, cobalt and manganese, expressed in (%):

Where, c---the actual concentration of the EDTA standard titration solution, expressed in (mol/L);

V2---the volume of the EDTA standard titration solution consumed in the titration of the test solution, expressed in (mL);

V0---the volume of the EDTA standard titration solution consumed in the titration of the blank test solution, expressed in (mL);

M---the average molar mass of nickel, cobalt and manganese, expressed in (g/mol);

V4---the dilution volume of test solution, expressed in (mL);

m---the mass of the specimen, expressed in (g);

V3---the volume of divided test solution, expressed in (mL).

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