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Method for detecting magnetic substance content of lithium ion battery positive electrode material

A technology of lithium-ion batteries and magnetic substances, which can be used in the analysis of materials, material excitation analysis, color/spectral characteristic measurement, etc., and can solve problems such as troublesome operation

Inactive Publication Date: 2017-05-03
SHENZHEN BAK POWER BATTERY CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The current method for detecting the content of magnetic substances in the positive electrode material of lithium-ion batteries is cumbersome to operate

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] Step 1. A polytetrafluoroethylene-coated magnet (hereinafter referred to as the magnet), soaked in 35mL hydrochloric acid for 30min, took out the magnet, and cleaned the magnet with pure water for the next experiment.

[0054] Step S2, put a magnet, 300g lithium cobaltate and 100mL water in a 500mL bottle, disperse by ultrasonic wave at 80kHz for 30min, stir and mix at a speed of 60r / min for 30min, and use a magnetic rod coated with polytetrafluoroethylene plastic magnet.

[0055] Step S3, after cleaning the magnet with pure water, put it into water and perform ultrasonic cleaning at a frequency of 80 kHz for 30 minutes. Then soak the magnet in a PTFE container containing 35mL of hydrochloric acid with a mass concentration of 18%, heat it ultrasonically at 60°C, and keep the temperature constant for 30min to obtain a solution. The ultrasonic frequency is 80kHz. Pour the solution into a 50ml volumetric flask, the resulting solution is solution A11, and clean the magnet ...

Embodiment 2

[0059] Step 1. A polytetrafluoroethylene-coated magnet (hereinafter referred to as the magnet), soaked in 35mL hydrochloric acid for 30min, took out the magnet, and cleaned the magnet with pure water for the next experiment.

[0060] Step S2, put a magnet, 300g lithium cobaltate and 100mL water in a 500mL bottle, disperse by ultrasonication at a frequency of 80kHz for 10min, stir and mix at a speed of 60r / min for 30min, and use a magnetic rod coated with polytetrafluoroethylene plastic magnet.

[0061] Step S3, after cleaning the magnet with pure water, put it into water and perform ultrasonic cleaning at a frequency of 80 kHz for 30 minutes. Then soak the magnet in a PTFE container containing 35mL of hydrochloric acid with a mass concentration of 18%, heat it ultrasonically at 60°C, and keep the temperature constant for 30min to obtain a solution. The ultrasonic frequency is 80kHz. Pour the solution into a 50ml volumetric flask, the resulting solution is solution A21, and cl...

Embodiment 3

[0065] Using 25.2 mg of iron powder instead of lithium cobaltate in Example 1 to carry out steps S1 to S3, the parameters are exactly the same as those in Example 1 to obtain solution A31.

[0066] 35.2 mg of iron powder was reacted with 35 ml of 18% hydrochloric acid to obtain a solution SF.

[0067] Testing and Analysis

[0068] Heat and concentrate solution A11, solution A12, solution A13, solution A31 and solution SF to 5mL respectively, then use a volumetric flask to set the volume to 500ml, then dilute 20 times to obtain the solution to be tested, and test the content of the magnetic substance by ICP on the side solution.

[0069] The test results are as follows:

[0070] 1. Solution SF:

[0071] Test result C(Fe)=3.375 μg / mL.

[0072] m(Fe)=C(Fe)×V×dilution factor=3.375×500×20=33750 μg.

[0073] Iron powder purity:

[0074] r(Fe)=m(Fe) / m(i.p.)=33.75mg / 35.2mg=95.9%.

[0075] Due to the large surface area of ​​iron powder, it is easily oxidized and contains oxygen d...

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Abstract

The invention provides a method for detecting magnetic substance content of a lithium ion battery positive electrode material. The method comprises placing a positive electrode material and a polymer-coated magnet in a dispersion liquid, carrying out ultrasonic dispersion at frequency of 20 to 100kHz for 30 minutes, carrying out stirring at a rotation rate of 60r / min for 30min so that the polymer-coated magnet adsorbs the magnetic substance in the positive electrode material, tanking the polymer-coated magnet adsorbed with the magnetic substance out of the dispersion liquid, carrying out ultrasonic cleaning, putting the cleaned polymer-coated magnet adsorbed with the magnetic substance into hydrochloric acid having a mass concentration of 18% so that the magnetic substance is dissolved to form a solution, taking the polymer-coated magnet out of the solution, and detecting the content of the magnetic substance in the solution. The method can accurately detect magnetic substance content of a lithium ion battery positive electrode material.

Description

technical field [0001] The invention relates to the technical field of lithium-ion battery cathode materials, in particular to a method for detecting the content of magnetic substances in lithium-ion battery cathode materials. Background technique [0002] Lithium-ion batteries have many excellent characteristics such as high energy density and good cycle performance, and have been widely used in portable electronic products, communication tools, electric vehicles and energy storage equipment. The rapidly growing market puts forward urgent requirements for lithium-ion batteries with high capacity, long life, and high safety. The improvement of the performance of lithium-ion batteries has become the key to the development of the industry, and the performance of lithium-ion batteries depends to a large extent on the cathode Material. [0003] In recent years, studies have found that lithium-ion battery cathode materials contain magnetic impurities. These magnetic substances ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N1/28G01N1/34G01N21/73G01N21/31
CPCG01N1/28G01N1/34G01N21/3103G01N21/73
Inventor 刘玉梅陈进英
Owner SHENZHEN BAK POWER BATTERY CO LTD
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