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Method for measuring proportions of nickel, cobalt and manganese in ternary elements NCM

A ternary material and ratio technology, applied in the detection and analysis of lithium battery materials, can solve the problems of long time consumption, poor stability, poor reproducibility, etc., and achieve the goal of reducing workload, ensuring stability and speeding up the operation process Effect

Pending Publication Date: 2019-06-14
HUAYOU NEW ENERGY TECH (QUZHOU) CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The technical problem to be solved by the present invention is to overcome the shortcomings of the existing NCM materials such as long time-consuming determination and analysis of nickel, cobalt and manganese content, poor stability, poor reproducibility, etc., to provide a fast and stable determination of ternary material NCM The method of medium nickel, cobalt and manganese ratio can reduce the operation steps and shorten the detection time as much as possible, and at the same time, improve the stability of detection, which is very suitable for the needs of large-scale and continuous industrial production analysis

Method used

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  • Method for measuring proportions of nickel, cobalt and manganese in ternary elements NCM
  • Method for measuring proportions of nickel, cobalt and manganese in ternary elements NCM

Examples

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Effect test

Embodiment 1

[0067] In this embodiment, the 523 type NCM material is used as a sample to verify the stability of the test of the present invention. The specific implementation steps are as follows:

[0068] 1.1) Weigh about 1.2g sample, accurate to 0.0002g, put it in a 250mL beaker, add 20mL (1+1) hydrochloric acid, heat until the sample is completely dissolved, cool to room temperature, transfer it completely to a 200mL volumetric flask, and rinse with water Dilute to volume and shake well.

[0069] 1.2) Pipette 20mL of the test solution, put it in a 250mL volumetric flask, add 5mL (1+1) nitric acid, dilute with water to the mark, shake well, and wait for the test.

[0070] 1.3) Turn on the ICP instrument according to the operating procedures, select the required test method, test the standard curve first, and require the linear correlation of each element to be above 0.9999 before the standard curve can be recognized as qualified.

[0071] 1.4) After the standard curve is qualified, te...

Embodiment 2

[0080] In this embodiment, the 622 type NCM material is used as a sample to verify the stability of the present invention. The specific implementation steps are as follows:

[0081] 2.1) Weigh about 1.0g sample, accurate to 0.0002g, put it in a 250mL beaker, add 20mL (1+1) hydrochloric acid, heat until the sample is completely dissolved, cool to room temperature, transfer it completely to a 200mL volumetric flask, and rinse with water Dilute to volume and shake well.

[0082] 2.2) The remaining steps are the same as in Example 1.

[0083] 2.3) The test results are as follows:

[0084] Table six embodiment 2 test results

[0085]

[0086] It can be seen from Table 6 above that the range of the test is not greater than 0.25%, and the relative standard deviation is not greater than 0.30%, indicating that the stability of the test is very good.

Embodiment 3

[0088] In this embodiment, a 65:15:20 type NCM material is used as a sample to verify the stability of the test of the present invention. The specific implementation steps are as follows:

[0089] 3.1) Weigh about 1.1g sample, accurate to 0.0002g, put it in a 250mL beaker, add 20mL (1+1) hydrochloric acid, heat until the sample is completely dissolved, cool to room temperature, transfer it completely to a 200mL volumetric flask, and rinse with water Dilute to volume and shake well.

[0090] 3.2) The remaining steps are the same as in Example 1.

[0091] 3.3) The test results are shown in Table 7:

[0092] Table seven embodiment 3 test results

[0093]

[0094] It can be seen from the above table 7 that the range of the test is not more than 0.30%, and the relative standard deviation is not more than 0.35%, which shows that the stability of the test is good.

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Abstract

The invention discloses a method for measuring proportions of nickel, cobalt and manganese in ternary elements NCM. According to the method, an ICP instrument is used for measuring the proportions ofnickel, cobalt and manganese in to-be-tested solution. The method comprises the following steps of: preparing standard solution and preparing three standard points, wherein the standard solution STD1at the first standard point has a metal ion total concentration of 120-200 mg / L, the standard solution STD2 at the second standard point has a metal ion total concentration of 230-320 mg / L, the standard solution STD3 at the third standard point has a metal ion total concentration of 330-390 mg / L, and the metal ions are metal ions of nickel, cobalt and manganese. According to the method, only the ICP is adopted to measure the proportions of nickel, cobalt and manganese, so that the requirement for the operations such as weighing, capacity setting and movement is not high, the operation is convenient and the material pretreatment process is accelerated. Compared with the existing industrial standard, the method is capable of saving the interior label yttrium element and saving the fussy operations without influencing the stability of the test result.

Description

technical field [0001] The invention belongs to the detection and analysis field of lithium battery materials, specifically a method for quickly and stably measuring the ratio of nickel, cobalt and manganese in ternary material NCM, which is suitable for the preparation of NCM mixed liquid in the process of ternary precursor synthesis and batching , ternary precursors and detection and analysis of ternary cathode materials. 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...

Claims

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Application Information

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IPC IPC(8): G01N21/73G01N1/28
Inventor 欧阳曦郁惠坤姚未杰童锋曾兴寿
Owner HUAYOU NEW ENERGY TECH (QUZHOU) CO LTD
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