Method for determining total amount of nickel, cobalt and manganese in NCM material through complexometric titration method

Abstract

The invention discloses a method for determining the total amount of nickel, cobalt and manganese in a NCM material through a complexometric titration method. In the prior art, the rapid test of the total amount of nickel, cobalt and manganese is performed by using the EDTA complexometric titration method, and a lot of differences exist in the specific test operations. According to the present invention, the auxiliary reagent hydroxylamine hydrochloride is additionally used in the complexometric titration method, wherein the color change at the ending point is significant and the test result is stable and accurate by adding the reagent; during the titration test, the buffer solution and the murexide indicator are added at 1-2 ml position before the ending point, such that the test result is stable and accurate; with the method, the total amount of nickel, cobalt and manganese in the NCM material can be quickly, accurately and stably determined, wherein the test result is close to the real value by verifying the standard sample; and the method has characteristics of low requirements on operators, easy grasping, good reproducibility of test result and significantly-shortened test time, and can completely meet the requirements of large-scale and continuous production.

Description

technical field [0001] The invention belongs to the field of detection and analysis of positive electrode materials of lithium batteries, and relates to a method for rapidly, accurately and stably measuring the total amount of nickel, cobalt and manganese in NCM materials by complexometric titration. Background technique [0002] With the rapid development of new energy technologies, the application of lithium batteries is becoming more and more extensive. At the same time, because people are paying more and more attention to environmental protection, Western European countries, Japan, India, the United States, China and other countries have formulated a timetable for the withdrawal of fuel vehicles, and will replace fuel-powered vehicles with new energy vehicles. [0003] Nickel cobalt lithium manganese oxide (NCM series) lithium-ion battery cathode material has the advantages of high specific capacity, wide discharge voltage range, stable electrochemical performance, and g...

AI Technical Summary

Problems solved by technology

[0005] For the total amount of nickel, cobalt, and manganese in NCM materials, the traditional method is to use conventional chemical methods to first measure the content of nickel, cobalt, and manganese in the material separately, and then add the three components to get the total amount; therefore, three conventional methods are required. Chemical analysis and test analysis take a long time, and there are errors in each test, so the reproducibility of the total nickel, cobalt and manganese tests is not good

Now, although the industry tries to use EDTA complexometric titration to quickly test the total amount of nickel, cobalt and manganese, there are still many differences in the specific test operations

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