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Method for detecting lithium content in lithium battery cathode material mixture

A cathode material and mixing technology, which is applied in the direction of analyzing the material by chemical reaction, analyzing the material by observing the influence on the chemical indicator, and performing chemical analysis by titration, etc. It can solve the problem of expensive ICP instruments, dilution, etc. error, non-environmental protection and other issues

Inactive Publication Date: 2016-10-26
TIANJIN GUOAN MGL NEW MATERIALS TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] (1) ICP is mainly used to detect the content of trace elements. However, the content of lithium element in the first mixture of lithium battery cathode materials is generally 5-7%. This concentration greatly exceeds the detection range of ICP, and often exceeds the detection range of ICP. Therefore, it is difficult to use ICP to test accurately, and the results fluctuate greatly. Moreover, if the sample is excessively diluted, it will cause dilution errors, which is strictly prohibited when using ICP for detection;
[0005] (2) It takes a long time to dissolve samples with acid. If you encounter insoluble samples, you need to use strong oxidizing acids such as perchloric acid, which is not environmentally friendly;
[0006] (3) The ICP instrument is expensive and the maintenance cost is high

Method used

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  • Method for detecting lithium content in lithium battery cathode material mixture
  • Method for detecting lithium content in lithium battery cathode material mixture
  • Method for detecting lithium content in lithium battery cathode material mixture

Examples

Experimental program
Comparison scheme
Effect test

experiment example 1

[0056] Three samples were taken respectively at 5 different sampling points in a lithium battery cathode material-mixture with lithium carbonate as a lithium source, and the method provided by the invention was used to detect the content of lithium element wherein, the average detection result of each sampling point And the theoretical values ​​are shown in Table 1 below:

[0057] Table 1 Test results of 5 sampling points

[0058]

[0059] As can be seen from Table 1, each sampling point is very close to the theoretical value, and the relative standard deviation RSD is very low, which shows that the method accuracy provided by the present invention is high, only 0.008%, which shows that the method precision provided by the present invention is also high , indicating that the above sample has been fully mixed evenly.

experiment example 2

[0061] Carry out lithium content test with the present invention and ICP method respectively to two samples, the result is as shown in table 2 below,

[0062] The result of table 2 inventive method and ICP method testing lithium content

[0063]

[0064] As can be seen from Table 2, for sample 1, the RSD (relative standard deviation) detected by the method of the present invention is 0.0044%, while the RSD (relative standard deviation) detected by the ICP method is 0.062%, a difference of nearly 15 times;

[0065] For sample 2, the RSD (relative standard deviation) detected by the method of the present invention is 0.0050%, while the RSD (relative standard deviation) detected by the ICP method is 0.088%, a difference of nearly 17 times;

[0066] It can be seen that the RSD (relative standard deviation) of the results detected by the method of the present invention is smaller, indicating that the results detected by the method of the present invention are more stable, and th...

experiment example 3

[0068] Detect lithium content in 6 different samples respectively with method of the present invention and ICP method, the result is as shown in table 3 below,

[0069] Table 3 Test results of 6 different samples

[0070] Sample serial number

Theoretical Liwt%

Liwt% of the present invention

ICP Liwt%

1

6.33

6.38

6.64

2

8.49

8.57

8.98

3

6.11

6.19

6.50

4

6.00

6.07

6.43

5

6.03

6.04

6.66

6

5.56

5.60

6.06

[0071] As can be seen from Table 3, the lithium content detected by the method provided by the invention is closer to the theoretical value (true value), while the lithium content obtained by the ICP method deviates greatly from the theoretical value.

[0072] It can also be seen from comprehensive experimental examples 1 to 3 that the method provided by the invention can achieve good detection for a mixture with a lithium content in the range of 5.56% to 8.49%, th...

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Abstract

The invention provides a method for detecting lithium content in lithium battery cathode material mixture, the method uses water as a solvent and methyl red and bromocresol green as an indicator, and titrates the lithium battery cathode material mixture by using a standard solution, it is possible to sensitively indicate a titration endpoint, and the method provided herein is high in accuracy and precision of detection results and is particularly suited for the content of lithium element in lithium battery cathode material mixture where except for a lithium source, all other components are not soluble in water or never react with an acid after being dissolved in water.

Description

technical field [0001] The invention relates to the field of preparation of positive electrode materials for lithium batteries, in particular to a method for testing the lithium content in a mixture of positive electrode materials for lithium batteries. Background technique [0002] At present, the method for preparing positive electrode materials for lithium-ion batteries is mainly the solid-phase method, and the solid-phase method has higher requirements on the mixing uniformity of the first mixture during the preparation process. [0003] At present, there is no method reported in the prior art to test the lithium content of the lithium battery positive electrode material-mixture, and the method used in the industry is to dissolve the sample to be tested with acid, and then use ICP to test the content of lithium element therein, but this method is impossible. Defects to avoid, the main disadvantages are: [0004] (1) ICP is mainly used to detect the content of trace elem...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/78G01N31/16
CPCG01N21/78G01N31/16
Inventor 许敏沙金江卫军韩立娟庞自钊苏迎春
Owner TIANJIN GUOAN MGL NEW MATERIALS TECH CO LTD
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