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Titration testing method for content of nickel, cobalt and aluminum in nickel-cobalt-aluminum ternary material or precursor thereof

A ternary material and testing method technology, applied in chemical analysis by titration method, material analysis, material analysis by optical means, etc., can solve the problems of high purchase and maintenance costs, achieve low cost, avoid equipment, and simple method easy effect

Active Publication Date: 2020-09-25
SUZHOU YOULION BATTERY INC
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, most of the instruments such as plasma emission spectrometry or atomic absorption spectrometry are used to test the metal content in ternary materials or precursors, but most of the instruments are precision instruments, and the purchase and maintenance costs are relatively high

Method used

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  • Titration testing method for content of nickel, cobalt and aluminum in nickel-cobalt-aluminum ternary material or precursor thereof
  • Titration testing method for content of nickel, cobalt and aluminum in nickel-cobalt-aluminum ternary material or precursor thereof
  • Titration testing method for content of nickel, cobalt and aluminum in nickel-cobalt-aluminum ternary material or precursor thereof

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Embodiment 1

[0022] The present embodiment verifies the accuracy of the test method proposed by the present invention by preparing a nickel-cobalt-aluminum standard solution with known metal content, and the specific operation steps are as follows:

[0023] 1. Calibration of EDTA standard solution:

[0024] 1) Weigh high-purity nickel sheet as the reference material, and its purity and weight are as follows:

[0025] Table 1

[0026]

[0027] 2) Put high-purity nickel flakes in a 250mL beaker, add 10mL of concentrated nitric acid, cover with a watch glass until the nickel flakes are completely dissolved, after cooling, transfer to a 250ml volumetric flask, and constant volume;

[0028] 3) Weigh a certain amount of disodium ethylenediaminetetraacetic acid to prepare EDTA, put it in a beaker, add 50ml of deionized water and stir to dissolve, after completely dissolving, transfer to a 500ml volumetric flask, and constant volume;

[0029] 4) Pipette 25.00ml of nickel standard solution int...

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Abstract

The invention provides a titration testing method for the content of nickel, cobalt and aluminum in a nickel-cobalt-aluminum ternary material or a precursor thereof. The titration testing method comprises the following steps: 1) dissolving a nickel-cobalt-aluminum ternary material or a precursor thereof to obtain a nickel-cobalt-aluminum solution; 2) determining the total amount of nickel, cobaltand aluminum ions by an EDTA back titration method; (3) precipitating by using a precipitator, filtering to remove aluminum ions, determining the total amount of nickel and cobalt ions by using EDTA titration filtrate, and calculating the difference value with the total amount of nickel, cobalt and aluminum ions to obtain the content of aluminum ions; 4) adding a proper oxidant and a complexing agent into the filtrate, shielding the cobalt ions in the filtrate, and titrating the content of nickel ions in the filtrate by using EDTA; and 5) calculating the difference between the measured nickelion content and the total amount of nickel and cobalt ions to obtain the cobalt ion content. The method provided by the invention has the advantages of small relative error of nickel, cobalt and aluminum contents in the test sample, high repeatability, economy and low test condition requirements, and is a test method suitable for work production.

Description

technical field [0001] The invention relates to the technical field of lithium-ion battery material testing, in particular to a titration test method for nickel-cobalt-aluminum content in a nickel-cobalt-aluminum ternary material or a precursor thereof. Background technique [0002] Nickel-rich ternary lithium-ion battery cathode material NCA (LiNi0.8Co0.15Al0.05O2) has the advantages of high discharge specific capacity, good thermal stability, and low cost, and is considered to be one of the most promising cathode materials. NCA has been partially used in lithium-ion batteries for power vehicles. For battery manufacturers, the content of various metal elements in NCA, especially nickel content, is one of the important indicators for incoming inspection. [0003] For material manufacturers, accurate determination of the total amount of elements in the precursor of the nickel-cobalt-aluminum ternary material can ensure a constant ratio of lithium / metal (the total content of ...

Claims

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Application Information

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IPC IPC(8): G01N31/16G01N21/78
CPCG01N21/78G01N31/16G01N2021/775
Inventor 傅裕刘贯东毛焕宇
Owner SUZHOU YOULION BATTERY INC
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