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Electrochemical method for rinsing negative copper foil after lithium ion battery invalidation

A lithium ion battery and copper foil technology, which is applied in the electrochemical field of cleaning the negative electrode copper foil after the failure of the lithium ion battery, can solve the problem that the negative electrode cannot be analyzed, the analysis result is distorted, and the black material of the copper foil cannot be effectively removed, etc. problems, to achieve the effect of significant production practical significance

Inactive Publication Date: 2009-08-26
TIANJIN LISHEN BATTERY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] After the lithium-ion battery fails in a safety accident, the battery is severely damaged and there are few remaining clues. Most of the positive plates are completely burned and the diaphragm is melted. Only the negative plate can be partially or completely left. The residual colloidal substances such as burning have strong adhesion on the surface of the negative electrode, and it is extremely difficult to remove them, resulting in the inability to accurately analyze the negative electrode
[0005] An existing method for removing burnt deposits on the surface of the negative electrode copper foil is: soaking the negative electrode copper foil in an organic solvent such as acetone, DMC, or in a strong alkali solution for a long time and ultrasonically oscillating it. The method cannot effectively remove the black substance on the surface of the copper foil, and it is easy to cause damage to the copper foil, and the original appearance of the copper foil cannot be maintained, which eventually leads to distortion of the analysis results of safety failure

Method used

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  • Electrochemical method for rinsing negative copper foil after lithium ion battery invalidation
  • Electrochemical method for rinsing negative copper foil after lithium ion battery invalidation

Examples

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Embodiment 1

[0039] Weigh 5g of sodium silicate, 30g of trisodium phosphate, 55g of sodium carbonate, and 0.5g of sodium hydroxide, respectively, and dissolve them in 1L of deionized water, and use figure 2 The magnetic stirrer 4 shown was vigorously stirred until the solution was completely dissolved, and then stood still for 1 h to stabilize the solution. Take an area of ​​200cm 2 The stainless steel sheet is used as the anode, the negative electrode sheet of the battery to be cleaned is used as the cathode, and the DC regulated power supply produced by Tianjin Zhonghuan Electronics provides current. figure 2 Electrolysis was performed in the setup shown. The electrolysis conditions are: temperature at room temperature, current density 15mA / cm 2 , Magnetic stirring, electrolysis time 3min. After the electrolysis operation is completed, turn off the power and take out the negative electrode piece and rinse it with deionized water to remove the black attachment on the surface, and the...

Embodiment 2

[0041] Weigh 125 g of sodium carbonate and 5 g of sodium hydroxide and dissolve them in 1 L of deionized water in turn, and stir vigorously until completely dissolved to obtain an alkaline cleaning solution. Take an area of ​​200cm 2 The stainless steel sheet is used as the anode, and the negative electrode sheet of the battery to be cleaned is used as the cathode for constant current cathode electrolysis. figure 2 Electrolysis was performed in the setup shown. The electrolysis conditions are: temperature at room temperature, current density 20mA / cm 2 , Magnetic stirring, electrolysis time 1min. After the electrolysis operation is completed, power off and take out the negative plate, rinse it with deionized water, and dry it.

[0042]In summary, compared with the prior art, the present invention provides an electrochemical method for cleaning the negative electrode copper foil after the failure of the lithium ion battery. The attachment does not damage the surface state o...

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Abstract

The invention discloses an electrochemical method for rinsing a negative copper foil after a lithium ion battery fails, comprising the following steps: preparing electrolysing solution with weak alkalescence; soaking stainless steel sheet, lead net, graphite, titanium net, titanium sheet or graphite sheet which are used as the anode and negative copper foil which is used as cathode respectively into the electrolysing solution, and connecting the D.C. regulated power supply to carry out constant-current electrolysis under room temperature; taking out the negative copper foil of the solution after the constant-current electrolysis is finished and rinsing the negative copper foil with de-ionized water to obtain the clean negative copper foil. Compared with the prior art, the invention provides an electrochemical method for rinsing a negative copper foil after a lithium ion battery fails, the method can efficiently clear away the attachments on the surface of the negative copper foil after the battery fails without damage to the surface texture of the negative copper foil, thus being beneficial for analyzing the property of the copper foil to precisely find out the reason behind the occurrence of the battery failing accident and having great significance in productive practice.

Description

technical field [0001] The invention relates to the technical field of battery safety, in particular to an electrochemical method for cleaning negative electrode copper foils after lithium-ion batteries fail. Background technique [0002] Lithium-ion batteries have the advantages of high voltage, high specific energy, many cycle times, and long storage time. They are not only widely used in portable electronic devices, but also widely used in large and medium-sized electric devices such as electric vehicles, electric bicycles, and electric tools. On the one hand, it is the main development direction of major battery manufacturers at present. [0003] Lithium-ion batteries may explode, catch fire and other safety accidents due to their own defects and abuse. If the cause of safety failure can be accurately and effectively identified, it will be beneficial for lithium-ion battery manufacturers to find out the cause and improve it, thereby improving battery safety performance....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25F1/04
Inventor 朱静陈志奎于申军
Owner TIANJIN LISHEN BATTERY