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Rapid determination method for chloride ions in lithium battery copper foil electrolyte

An electrolyte, chloride ion technology, applied in the field of analysis and detection, can solve the problems of long analysis process, large analysis deviation, poor reliability, etc., to achieve the effect of short analysis process, easy operation and improved analysis speed

Pending Publication Date: 2020-10-09
JINCHUAN GROUP LIMITED
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Usually, the analysis of chloride ions in the electrolyte adopts silver chloride precipitation visual turbidimetry, precipitation and separation of copper silver chloride spectrophotometry, mercury thiocyanate-bond salt indirect solubility method, electrochemical pulse voltammetry, etc., the above methods Either there are large analysis deviations and poor reliability, or the analysis process is long and inefficient

Method used

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  • Rapid determination method for chloride ions in lithium battery copper foil electrolyte
  • Rapid determination method for chloride ions in lithium battery copper foil electrolyte
  • Rapid determination method for chloride ions in lithium battery copper foil electrolyte

Examples

Experimental program
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Effect test

Embodiment 1

[0034] like figure 1 Shown, a kind of rapid determination method of chloride ion in the lithium battery copper foil electrolyte, the step comprises:

[0035] (1) Preparation of sample solution and blank sample: pipette 10ml of the lithium battery copper foil electrolyte to be tested and place it in a 100ml volumetric flask, add 10ml of dilute nitric acid (volume ratio concentration is 50%, that is, the volume ratio of nitric acid to water 1:1), 10ml of silver nitrate solution (concentration: 100g / L), 10ml of ethylene glycol, dilute with water to 100ml to obtain the sample solution; make a blank sample along with the sample solution, and the blank sample No silver nitrate solution is added in the medium, that is: pipette 10ml of electrolyte solution into a 100ml volumetric flask, add 10ml of dilute nitric acid and 10ml of ethylene glycol in sequence, dilute with water to 100ml, and obtain a blank sample; among them, the sample solution The concentration of copper ions in the m...

Embodiment 2-3

[0045] Others are the same as in Example 1, the concentration of copper ions in the sample solution is 6g / L and 7g / L respectively, and the acidity is 0.07mol / L and 0.08mol / L.

[0046] Method precision

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Abstract

The invention discloses a rapid determination method for chloride ions in a lithium battery copper foil electrolyte, and belongs to the field of analysis and detection. The method comprises the following steps: (1) transferring and treating a sample and a sample blank; (2) preparing a matrix solution; (3) drawing a measurement standard working curve; (4) measuring the absorbance of the sample solution; and (5) calculating the content of chloride ions in the sample according to the absorbance value of the solution and the working curve. An effective method for eliminating copper matrix interference is adopted, compared with an original copper matrix separation method, the analysis speed is increased by 2.5 times, the single-sample measurement time is shorter than 25 minutes, the analysis speed is increased, the labor intensity is relieved, the standard recovery rate of the method reaches 97.2% or above, and the analysis relative deviation is lower than 4.75%. The method has the characteristics of simplicity and convenience in operation, short analysis flow, high analysis speed, high analysis accuracy, no need of separating a copper matrix and the like, provides reliable guarantee for uniform, continuous and stable production of the lithium battery copper foil, and has remarkable benefits.

Description

technical field [0001] The invention belongs to the field of analysis and detection, and in particular relates to a rapid determination method for chloride ions in lithium battery copper foil electrolyte. Background technique [0002] Electrolytic copper foil is one of the important basic materials in the electronics industry and is widely used in the electronics industry. Electrolytic copper foil not only serves as the carrier of the negative electrode active material in the lithium battery, but also acts as the collector and transporter of the negative electrode electron flow. Therefore, the electrolytic copper foil current collector has a great influence on the electrochemical performance of the lithium battery. With the development of battery production technology and the improvement of the performance of ultra-thin electrolytic copper foil, lithium battery manufacturers usually use electrolytic copper foil to make the negative electrode current collector of lithium batt...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/78G01N21/31G01N1/28
CPCG01N21/78G01N21/31G01N1/28
Inventor 陈维川闫文彬别良伟胡政斌孙莉马斌刘文婷
Owner JINCHUAN GROUP LIMITED
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