Method for detecting metal foreign matters in organic polymer and application

A metal foreign body and detection method technology, applied in the field of analysis and testing, can solve the problems of hidden safety hazards in the operation process and low detection results, and achieve the effect of improving accuracy and reducing safety risks

Pending Publication Date: 2022-07-01
SVOLT ENERGY TECHNOLOGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Therefore, the technical problem to be solved in the present invention is to overcome defects such as low detection results and potential safety hazards in the operation process of the detection

Method used

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  • Method for detecting metal foreign matters in organic polymer and application
  • Method for detecting metal foreign matters in organic polymer and application
  • Method for detecting metal foreign matters in organic polymer and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] A kind of detection method of metal foreign matter in organic polymer, concrete operation procedure and technological condition are as follows:

[0048] (1) Cleaning of platinum crucible: use 30mL platinum crucible and lid, soak it with dilute hydrochloric acid (10wt%) and heat it at 120℃ for 30min before use to remove impurities on the platinum crucible, then wash it with ultrapure water for three times, 75 ℃ drying in an air drying oven for 2h.

[0049] (2) Constant weight of platinum crucible: put the cleaned platinum crucible and lid into a muffle furnace, calcine at 800°C for 2 hours, take it out and put it in a desiccator, cool to room temperature and weigh, and record the mass M1; repeat the previous Step, record the mass M2, when the mass of M1 and M2 are the same, go to the next step (the same quality means that the error of the two weighings is within 3 mg, the same below), if they are inconsistent, repeat the above steps until the mass is the same.

[0050] ...

Embodiment 2

[0057] A kind of detection method of metal foreign matter in organic polymer, concrete operation procedure and technological condition are as follows:

[0058] (1) Cleaning of platinum crucible: use 30mL platinum crucible and lid, soak it with dilute hydrochloric acid (10wt%) and heat it at 120℃ for 30min before use to remove impurities on the platinum crucible, then wash it with ultrapure water for three times, 75 ℃ drying in an air drying oven for 2h.

[0059] (2) Constant weight of platinum crucible: put the cleaned platinum crucible and lid into a muffle furnace, calcine at 800°C for 2 hours, take it out and put it in a desiccator, cool to room temperature and weigh, and record the mass M1; repeat the previous Step, record the quality M2, when the quality of M1 and M2 are the same, go to the next step, if not, repeat the above steps until the quality is the same.

[0060] (3) Weighing the sample: Weigh 1.0009g of polyvinylidene fluoride sample using a 1 / 10,000 balance and...

Embodiment 3

[0067] A kind of detection method of metal foreign matter in organic polymer, concrete operation procedure and technological condition are as follows:

[0068] (1) Cleaning of platinum crucible: use 30mL platinum crucible and lid, soak it with dilute hydrochloric acid (10wt%) and heat it at 120℃ for 30min before use to remove impurities on the platinum crucible, then wash it with ultrapure water for three times, 75 ℃ drying in an air drying oven for 2h.

[0069] (2) Constant weight of platinum crucible: put the cleaned platinum crucible and lid into a muffle furnace, calcine at 800°C for 2 hours, take it out and put it in a desiccator, cool to room temperature and weigh, and record the mass M1; repeat the previous Step, record the quality M2, when the quality of M1 and M2 are the same, go to the next step, if not, repeat the above steps until the quality is the same.

[0070] (3) Weighing the sample: Weigh 1.0012 g of the polyvinylidene fluoride sample using a 1 / 10,000 balanc...

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Abstract

The invention belongs to the technical field of analysis and testing, and particularly relates to a method for detecting metal foreign matters in an organic polymer and application. The technical scheme provided by the invention comprises the following steps: firstly, pretreating a sample to be tested by using concentrated sulfuric acid, then roasting and ashing, and finally testing by adopting inductively coupled plasma emission spectrometry (ICP-OES) or atomic absorption spectrometry (AAS). Sulfuric acid is used for carbonization, so that the organic polymer is partially dissolved, and the sample can be more easily ashed in the subsequent roasting process. In the roasting ashing process, concentrated sulfuric acid is reserved in a sample, small ashed particles can be prevented from flying away, in addition, the concentrated sulfuric acid can fix metal elements, the accuracy of a detection result is improved, and meanwhile, the safety risk caused by open fire can be avoided.

Description

technical field [0001] The invention belongs to the technical field of analysis and testing, and in particular relates to a detection method and application of metal foreign matter in organic polymers. Background technique [0002] Lithium-ion batteries are widely used in mobile phones, tablet computers and power equipment due to their high energy density and long cycle life. The structural composition of a lithium-ion battery generally includes a positive electrode, a separator, a negative electrode, an electrolyte and an outer casing. [0003] Lithium-ion battery binder is an important component in the positive electrode slurry, which can bond the positive electrode particles together, and tightly bond the formed positive electrode slurry and aluminum foil together. The improvement of battery energy density also has an important impact on the electrochemical performance of the battery. If the binder contains metal impurities, these metal impurities will accumulate in the...

Claims

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Application Information

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IPC IPC(8): G01N21/73G01N21/31G01N1/28
CPCG01N21/73G01N21/3103G01N1/28
Inventor 霍四平刘宇春姚凌峰
Owner SVOLT ENERGY TECHNOLOGY CO LTD
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