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...