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A detection method for copper elemental content in lithium battery cathode material

A detection method and positive electrode material technology, applied in the field of lithium-ion batteries, can solve problems such as low accuracy and interference with copper single substance detection results

Active Publication Date: 2022-05-20
NINGDE AMPEREX TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the accuracy of the ICP detection method for ppb-level element detection is low, and ICP detects Cu element, and CuO particles in the positive electrode material will also interfere with the detection results of copper element

Method used

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  • A detection method for copper elemental content in lithium battery cathode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Prepare the solution to be tested:

[0037] Weigh 500g of lithium cobaltate powder; add 500mL of the first solvent to the lithium cobaltate powder, wherein the first solvent includes dilute sulfuric acid with a volume percentage of 10%, ascorbic acid with a mass percentage of 3%, and acetaldehyde with a volume percentage of 17%. , soaked for 10 hours after stirring for 5 minutes; then the filtrate and filter residue were separated by suction filtration; the filter residue was washed 3 times with deionized water; Soak for 1h; take the filtrate by suction filtration as the solution to be tested.

[0038] Copper content detection:

[0039]Heat and concentrate the collected filtrate to 50mL, add 10mL concentrated nitric acid after cooling, boil and concentrate to about 10mL, after cooling, transfer to a 50mL volumetric flask to constant volume as the sample solution.

[0040] Using 100 μg / ml of Cu standard solution mother solution, pipette an appropriate amount of Cu stan...

Embodiment 2

[0046] Example 2 is roughly the same as Example 1, except that the soaking time of the lithium cobalt oxide powder in the first solvent is 0.5 h.

Embodiment 3

[0048] Example 3 is roughly the same as Example 1, except that the soaking time of the lithium cobalt oxide powder in the first solvent is 2 hours.

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Abstract

The present application provides a method for detecting copper element content in lithium battery anode materials, comprising the following steps: soaking the lithium battery anode material to be tested in a first solvent containing a weak oxidizing acid and an antioxidant for reaction to obtain a first mixed solution; separating the first mixed solution to obtain a filter residue; soaking the filter residue in a second solvent containing ammonia and hydrogen peroxide for reaction to obtain a second mixed solution; separating the second mixed solution to obtain a filtrate; detecting the copper content in the filtrate. The detection method can eliminate the influence of copper oxide on the copper element in the positive electrode material of the lithium battery, and accurately measure the content of the copper element.

Description

technical field [0001] The present application relates to the technical field of lithium-ion batteries, in particular to a method for detecting the content of simple copper in lithium-ion battery cathode materials. Background technique [0002] Since the lithium battery cathode active material will contact copper parts during the manufacturing process, there will be a small amount of foreign matter particles such as copper and copper oxide in the lithium battery cathode material. Although the content of copper element is relatively small (the content of copper element is ppb level), due to the existence of copper element, not only will the specific capacity and energy density of the lithium battery be reduced, but also a series of problems will occur during the use of the lithium battery. Side reactions lead to a decrease in the consistency and safety performance of lithium batteries. The currently commonly used detection method is ICP (inductively coupled plasma, inductive...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/31G01N21/73G01N27/626
CPCG01N21/3103G01N21/73G01N27/62Y02E60/10
Inventor 徐江琼余敏高现红郭佳丽
Owner NINGDE AMPEREX TECH
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