Three-element determination method of nickel-cobalt-manganese ternary material

Abstract

The invention relates to a three-element determination method of a nickel-cobalt-manganese ternary material. The method comprises the following steps: determining the total quantity of cobalt, nickel and manganese ions by EDTA titration and recording titration consumption volume; sampling to an alkaline medium of ammonia chloride and ammonium to form nickel amine, oxidizing cobalt by utilizing hydrogen peroxide, complexing with ammonium to form a trivalent cobalt ammonia complex to generate manganese dioxide precipitate, filtering out the precipitate to obtain the filter liquid, titrating the filter liquid by utilizing EDTA in the presence of murexide serving as an indicator to determine the content of nickel, and recording the titration consumption volume; enabling the ammonia gas to escape from the solution after the nickel is determined through titration under the alkaline and heating condition and generating cobalt hydroxide precipitate at the same time, dissolving the cobalt hydroxide precipitate by utilizing acid, measuring the content of cobalt through EDTA titration, and recording the titration consumption volume; and calculating the respective content of the three elements according to the EDTA consumption volume in each step, the concentration of EDTA and the sample mass. The method is accurate in detection, high in detection efficiency, safe, environment-friendly and applicable to the detection of content of three elements in an anode material.

Description

technical field [0001] The invention relates to the technical field of multi-element content determination, in particular to a three-element determination method for a nickel-cobalt-manganese ternary material. Background technique [0002] With the continuous development of electronic products, lithium-ion batteries have been widely used, and the current electronic products are constantly being updated, and the requirements for lithium-ion battery products are also getting higher and higher. As we all know, the core component of a lithium-ion battery is the cell, and the composition and performance of the positive and negative materials in the cell play a vital role in the electrochemical performance of the battery. [0003] Ternary lithium battery is a new type of lithium battery developed in recent years with ternary materials as the positive electrode. The more commonly used ternary material is nickel-cobalt-manganese ternary material, and its performance is better than a...

AI Technical Summary

Problems solved by technology

The accuracy and precision of the ICP method are poor, and it is easy to cause large errors, while the chemical method detection of cobalt by potentiometric titration and nickel by precipitation method is cumbersome and time-consuming, and is not suitable for large-scale samples. detection

At present, there are also literature reports on the method of measuring single cobalt or nickel by EDTA titration method. For the detection of manganese, there are also literature reports on the detection method of detecting nickel and manganese respectively through precipitated manganese. Reagents such as NaCN are used to seal nickel, but NaCN is poisonous and harmful, and there are also literature reports. Using many reagents such as ammonium persulfate, triethanolamine, hydroxylamine hydrochloride, etc., the operation is cumbersome and the cost is high

In particular, NaCN is extremely toxic and is a highly toxic chemical. Considering safety factors, it is rarely used at present.

In addition, when using EDTA to measure manganese, since Mn 2+ In alkaline media, it is easy to be oxidized in the air, causing EDTA to be unable to coordinate and complex, resulting in low results, and a large amount of cobalt will be adsorbed in the process of manganese precipitation, resulting in detection errors, and the accuracy is low due to these interferences