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Method for testing content of magnetic substances in lithium ion battery anode material

A technology of lithium-ion batteries and magnetic substances, which is applied in the field of testing the content of magnetic substances in the positive electrode materials of lithium-ion batteries, can solve the problems of poor applicability and low detection accuracy, and achieve the effect of high accuracy

Inactive Publication Date: 2014-06-25
SHENZHEN DYNANONIC +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method directly uses a magnet to absorb the magnetic substance in the material, and there is a possibility that the magnetic substance cannot be completely adsorbed or the adsorbed magnetic substance is washed away because the outer layer is coated with a non-magnetic material, resulting in low detection accuracy, especially for testing Nanomaterials have poor applicability, and there are many nanomaterials in lithium-ion battery materials

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Weigh 100g of lithium-ion battery cathode material (lithium iron phosphate sample) into a high-temperature resistant plastic bottle, inject 100g of absolute ethanol, seal it with a cap, and put the bottle into an ultrasonic disperser for 60 minutes of ultrasonication.

[0031] Add a magnet to the bottle, continue to sonicate for 30 minutes, take out the magnet and put it into a clean beaker filled with ethanol solution, after 10 minutes of sonication, replace the ethanol solution in the beaker, repeat this step until the ethanol solution in the beaker is colorless after sonication , and no suspended matter.

[0032] Take out the magnet, put it into a clean beaker, add 20ml of nitric acid solution and 10ml of hydrochloric acid solution, heat it to a slight boil on the electric furnace and keep it for 15 minutes until the magnetic substance on the magnet is completely dissolved, rinse the magnet with deionized water until the solution middle. Filter the solution with a s...

Embodiment 2

[0035] Weigh 100g of lithium-ion battery cathode material (lithium cobalt oxide sample) into a high-temperature-resistant plastic bottle, inject 100g of isopropanol, seal it with a cap, and put the bottle into an ultrasonic disperser for 30 minutes of ultrasonication.

[0036] Add a magnet into the bottle, continue to sonicate for 40 minutes, take out the magnet and put it into a clean beaker containing isopropanol solution, after 10 minutes of sonication, replace the isopropanol solution in the beaker, repeat this step until the The propanol solution is colorless and has no suspended solids.

[0037] Take out the magnet, put it into a clean beaker, add 15ml of nitric acid solution and 10ml of hydrochloric acid solution, heat it to a slight boil on the electric furnace and keep it for 20 minutes until the magnetic substance on the magnet is completely dissolved, rinse the magnet with deionized water until the solution middle. Filter the solution with a sand core filter device...

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PUM

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Abstract

The invention discloses a method for testing the content of magnetic substances in a lithium ion battery anode material. The method comprises the following steps: ultrasonically dispersing a lithium ion battery anode material to be tested into a solvent, adding a polymer cladded magnet, ultrasonically adsorbing the magnetic substances, thereby obtaining the polymer cladded magnet adsorbed with the magnetic substances; adding the polymer cladded magnet adsorbed with the magnetic substances into a cleaning solution for performing ultrasonic cleaning; dissolving the cleaned polymer cladded magnet adsorbed with the magnetic substances by using an acidic reagent, thereby obtaining a dissolution solution; and testing the content of the magnetic substances in the dissolution solution. According to the method, the content of the magnetic substances in the lithium ion battery anode material can be accurately tested, particularly the content of the magnetic substances contained in micron order materials and nanoscale materials can be accurately detected. The testing method is simple, easy to operate and high in precision, and the precision can reach a ppb level.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion battery cathode materials, in particular to a method for testing 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 the positive electrode materials of lithium-ion batteries contain magnetic metal impurities. The...

Claims

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Application Information

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IPC IPC(8): G01N1/34G01N30/06G01N30/72
Inventor 尚伟丽孔令涌陈玲震覃浩谢立前许燕平
Owner SHENZHEN DYNANONIC
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