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Lithium ion battery shell lithium salt residue quantitative detection method

A quantitative detection method, lithium-ion battery technology, applied in measurement devices, material separation, instruments, etc.

Active Publication Date: 2017-04-26
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are no relevant patents and technologies for accurate qualitative and quantitative analysis of such salts, so it is very necessary to develop a detection method for the composition of shell salts

Method used

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  • Lithium ion battery shell lithium salt residue quantitative detection method
  • Lithium ion battery shell lithium salt residue quantitative detection method
  • Lithium ion battery shell lithium salt residue quantitative detection method

Examples

Experimental program
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Embodiment 1

[0039] A quantitative detection method for residual lithium salts in lithium-ion battery casings, comprising the following steps:

[0040] (1) Sample preparation: After dismantling the lithium-ion battery after liquid injection and formation, cut two aluminum blocks of the same size from the bottom of the shell containing more salt as sample 1 and sample 2;

[0041] (2) Qualitative analysis: place sample 1 in XRD, and scan at an angle of 5-90 degrees to determine the residual lithium salt composition on sample 1;

[0042] (3) Solid-phase extraction: put sample 1 in a 50mL beaker, add 10-20mL dilute hydrochloric acid solution and mix it, then ultrasonically vibrate it at a frequency of 25-100Hz for 30-60min, then let it stand; extract it with a syringe The supernatant in the flask was removed by a C18 organic solid-phase extraction column to remove large solids and organic matter, and then the extract was transferred to a 50ml volumetric flask and adjusted to 50ml with distille...

Embodiment 2

[0064] The main components of the electrolyte in lithium-ion batteries are LiF, LiPF 6 As an example to illustrate, the quantitative detection method for detecting residual lithium lithium salt in the lithium battery shell, the steps are as follows:

[0065] 1) Sample preparation: Disassemble the lithium battery after the injection and sealing, take the part with more salt at the bottom of the aluminum shell, and cut it into 1.5cm×1.5cm flakes of the same size as sample 1 and sample 2 with scissors;

[0066] 2) Qualitative analysis: put sample 1 in XRD, scan at an angle of 5-90 degrees, and determine that the main components of lithium salt remaining on the surface of the aluminum shell are LiF and LiPF 6 ;

[0067] 3) Solid-phase extraction: put sample 1 in a 50mL beaker, add 15mL of 2mom / L dilute hydrochloric acid solution, and then ultrasonically oscillate for 45min at an ultrasonic frequency of 50Hz. The phase extraction column removes the large particle solids and organ...

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Abstract

The present invention relates to a lithium ion battery shell lithium salt residue quantitative detection method, which comprises: sample preparation, qualitative analysis, solid phase extraction, comparison solution preparation, standard solution preparation, target substance content determination, and verification. According to the present invention, the lithium ion battery shell lithium salt residue is accurately and quantitatively detected; and the detection method has characteristics of easy operation and accurate quantitation, does not require expensive atomic absorption or atomic emission technology, can rapidly analyze the contents of different forms of the lithium salts in the lithium ion battery shell, can monitor the lithium salt reaction degrees at different stages, and provides important significance for the late-stage lithium battery cleaning and the lithium salt failure analysis.

Description

technical field [0001] The invention relates to the detection of aluminum case lithium battery case residues, in particular to a quantitative detection method for lithium ion battery case residual lithium salts. Background technique [0002] In recent years, with the development of new energy technologies and markets, lithium-ion batteries have become one of the most important power sources for electric vehicles. Electrolyte is one of the important components of lithium-ion batteries. Advances in lithium battery technology, such as increased energy density, improved safety, improved rate performance, and improved high and low temperature performance, etc., are inseparable from the development of new electrode systems. Open the support of electrolyte technology. In lithium-ion batteries, the composition of the lithium-ion electrolyte contains both inorganic salts and organic solvents and additives. The inorganic electrolyte salt in the electrolytic solution includes lithium...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N30/96G01N30/88G01N30/06
CPCG01N30/06G01N30/88G01N30/96G01N2030/062G01N2030/8859
Inventor 梅东海李涛史其乐嵇明翔
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY