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A method for detecting the amount of pre-lithium in a pole piece

A pole piece and pre-lithium technology, which is applied in the field of detecting the pre-lithium amount of the pole piece, can solve the problems of lack of pre-lithium amount, etc., and achieve the effects of test stability, simple operation, and high measurement accuracy

Active Publication Date: 2022-04-12
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the method of pre-lithiation of pole pieces is often used to supplement the consumed lithium ions, but there is currently a lack of a method for accurately measuring the amount of pre-lithium.

Method used

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  • A method for detecting the amount of pre-lithium in a pole piece
  • A method for detecting the amount of pre-lithium in a pole piece

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] A method for detecting the amount of pre-lithium in a pole piece, comprising the steps of:

[0023] according to figure 1 As shown, the graphite negative roll is placed on the unwinding roll 1 of the evaporation equipment, and the belt is passed through the main roll, and finally to the winding roll A; the PET film is placed on the unwinding roll 2, and the belt is passed through the main roll, Finally to the winding roller B, adjust the unwinding position so that the PET film (50mm wide, 50μm thick) completely covers the tabs (24mm high) at both ends of the negative electrode roll; the evaporation source is located directly below the main roller, and then the temperature of the evaporation source is adjusted to 515°C, main roll speed is 10m / min, and vacuum lithium plating treatment is carried out on the negative electrode roll and PET film at the same time;

[0024] After the lithium plating is finished, cut a 10mm×10mm PET film at a distance of 5m from the winding ro...

Embodiment 2

[0027] A method for detecting the amount of pre-lithium in a pole piece, comprising the steps of:

[0028] according to figure 1 As shown, the graphite negative roll is placed on the unwinding roll 1 of the evaporation equipment, and the belt is passed through the main roll, and finally to the winding roll A; the PET film is placed on the unwinding roll 2, and the belt is passed through the main roll, Finally to the winding roller B, adjust the unwinding position so that the PET film (50mm wide, 100μm thick) completely covers the tabs (24mm high) at both ends of the negative electrode roll; the evaporation source is located directly below the main roller, and then the temperature of the evaporation source is adjusted to At 495°C, the main roll speed is 0.44m / min, and the negative electrode roll and PET film are vacuum-plated with lithium at the same time;

[0029] After lithium plating is finished, cut a 10mm×10mm PET film at a distance of 10m from winding roller B, put it in...

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Abstract

The invention discloses a method for detecting the pre-lithium content of a pole piece, which comprises the following steps: covering the pole lugs on the pole piece with a PET film, performing lithium plating treatment on the PET film and the pole piece at the same time, and then intercepting the PET film and mixing it with a strong acid and Dilute with water and prepare the solution to be tested, detect the concentration of lithium element in the solution to be tested; finally calculate the pre-lithium layer thickness d=C*V / (ρ*S) on the pole piece, where C is the concentration of lithium element in the solution to be tested Concentration, the unit is μg / mL; V is the volume of the solution to be tested, the unit is mL; S is the area of ​​the intercepted PET film, the unit is mm 2 ; ρ is the density of lithium=0.534g / cm 3 . The invention can sample at a fixed point, and the method is simple to operate and has high measurement accuracy, and can accurately measure the pre-lithium amount at a designated position.

Description

technical field [0001] The invention relates to the technical field of lithium-ion batteries, in particular to a method for detecting the pre-lithium content of pole pieces. Background technique [0002] Lithium-ion battery is a lightweight and environmentally friendly battery with high voltage, high energy density, long cycle life, and good safety performance. It has been widely used in portable electronic devices such as mobile phones, video recorders, and tablet computers. It has also been applied to a certain extent. [0003] However, in the first few charging and discharging processes of the battery, a layer of solid electrolyte layer will be irreversibly formed at the interface between the electrode and the electrolyte, and 5-15% of lithium ions will be irreversibly consumed in this process, thus reducing the first Coulombic efficiency and Battery capacity has decreased. Therefore, supplementing the consumed lithium ions has become an effective means to improve the e...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/73G01N21/31
CPCG01N21/73G01N21/3103
Inventor 张俊曹勇许涛
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY
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