Method for testing nickel and cobalt contents in nickel compound by titration

A technology of nickel compound and titration method, which is applied in chemical analysis by titration method, material analysis by observing the influence on chemical indicators, and analysis by making materials undergo chemical reactions. Weighing error and other problems to achieve the effect of improving accuracy, low requirements, and reducing measurement error

Inactive Publication Date: 2009-12-23
BYD CO LTD
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  • Description
  • Claims
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Problems solved by technology

A small amount of samples will cause a large weighi

Method used

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  • Method for testing nickel and cobalt contents in nickel compound by titration
  • Method for testing nickel and cobalt contents in nickel compound by titration
  • Method for testing nickel and cobalt contents in nickel compound by titration

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Embodiment approach

[0017] According to one embodiment of the present invention, the method for measuring nickel and / or cobalt content in the soluble nickel compound provided by the invention comprises the following steps:

[0018] 1. Instruments and reagents:

[0019] Hydrochloric acid (analytically pure) and deionized water are mixed with hydrochloric acid aqueous solution according to the volume ratio of 1:1;

[0020] Ammonia water (analytical pure) 1: 1 and deionized water are mixed into ammonia water solution according to the volume ratio of 1: 1;

[0021] Violuric acid amine indicator: Weigh 1g viuric acid amine + 100g sodium chloride and grind it finely, set aside;

[0022] EDTA standard solution: the concentration of EDTA is about 0.05mol / L (calibrated to 0.0001mol / L with the reference ZnO burned to constant weight at 800°C.

[0023] Basic burette, titration stand, muffle furnace.

Embodiment 1

[0025] Take 5 samples, code them as samples No. 1, No. 2, No. 3, No. 4, and No. 5, and carry out the above tests respectively. The test steps are as follows:

[0026] (1) Sample dissolution: Accurately weigh about 1g of spherical nickel hydroxide sample (accurate to 0.0002g) into a 250ml triangular beaker, add the above-mentioned aqueous hydrochloric acid solution to dissolve, and set the volume in a 100ml volumetric flask to obtain a sample solution.

[0027] (2) Ni+Co total titration:

[0028] Accurately pipette 10ml of the above sample solution into a 250ml triangular beaker, add 20ml of deionized water, adjust the pH of the solution to 10-12 with ammonia water, add 0.2g of ammonium violate indicator, the solution is light brown, use the calibrated to Accurate to 0.0001mol / L EDTA standard solution titration, when the solution changes from light brown to bright purple is the end point, record the volume V of EDTA consumed 1 .

[0029] (3) Ni titration:

[0030] Accurately...

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Abstract

The invention relates to a method for testing nickel and cobalt contents in a nickel compound by a titration, which comprises the following steps of: 1) dissolving the nickel compound to obtain nickel solution; 2) taking the partial nickel solution obtained in step 1), and carrying out complexometric titration on the nickel solution to test the nickel and cobalt metal total content; 3) taking the partial nickel solution obtained in step 1), adding ammonium persulfate, and testing the nickel metal content by using the complexometric titration again; and 4) subtracting the nickel metal content in step 3) from the nickel and cobalt metal total content tested in step 2), and obtaining the cobalt metal content. The nickel and cobalt contents in samples tested by the testing method have the advantages of small relative error and high accuracy. The testing method has the advantages of good repeatability and lower requirements of test conditions at the same time, and is suitable for work and production.

Description

technical field [0001] The invention relates to a method for determining the contents of nickel and cobalt in soluble nickel compounds, in particular to a method for determining the contents of nickel and cobalt in soluble nickel compounds by coordination titration. Background technique [0002] Spherical nickel hydroxide is the positive electrode material of nickel rechargeable battery. Nickel is the main content, and cobalt is its important additive. The addition of cobalt can greatly improve the internal conductivity of the spherical nickel hydroxide crystal, increase the internal activity of the crystal, and fully exert its capacitance. If the cobalt content is too small, its effect cannot reach the expected effect. Too much content is not good for the cost, and even the performance of the battery will decrease instead. Accurate determination of nickel and cobalt content in spherical nickel hydroxide is of great significance to ensure the quality of nickel rechargeable...

Claims

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Application Information

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IPC IPC(8): G01N21/79G01N31/16
Inventor 付昌维
Owner BYD CO LTD
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