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Pre-lithiation amount detection method of pre-lithiation film

A detection method and pre-lithiation technology, applied in the direction of measuring electricity, measuring devices, measuring electrical variables, etc., to achieve the effect of reliable testing means, high measurement accuracy and simple operation

Active Publication Date: 2021-10-26
LIYANG TIANMU PILOT BATTERY MATERIAL TECH CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] For this reason, pre-lithiation film and pre-lithiation technology have been proposed in the industry, but there is currently a lack of a method for accurately measuring the pre-lithiation amount of the pre-lithiation film

Method used

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  • Pre-lithiation amount detection method of pre-lithiation film
  • Pre-lithiation amount detection method of pre-lithiation film

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0078] The button battery assembly of this embodiment 1 adopts: the negative pole piece is a lithium metal sheet with a diameter of 14 mm, the aluminum foil is a circular sheet with a diameter of 14 mm, the pre-lithiated film is a diameter of 16.5 mm, and the electrolyte is 1 mole of LiPF 6 (EC / DMC 1:1). The discharge current is 10uA, and the cut-off voltage is 4.2V. The test results are as follows: image 3 , the capacity is 0.1672mAh, after calculation, the pre-lithiation amount is 0.1086mAh / cm 2 .

Embodiment 2

[0080] The button cell assembly of the present embodiment 2 adopts: the negative pole piece is a graphite negative pole piece of 14mm, the aluminum foil is a circular piece with a diameter of 14mm, the pre-lithiated film is a diameter of 16.5mm, and the electrolyte is 1 mole of LiPF 6 (EC / DMC 1:1). The discharge current is 10uA, and the cut-off voltage is 4.2V. The test results are shown in the figure, and the capacity is 0.1408mAh. After calculation, the pre-lithiation amount is 0.091mAh / cm 2 .

Embodiment 3

[0082] In Example 3, the negative pole piece is a nano-silicon-carbon composite pole piece with a diameter of 14 mm, the aluminum foil is a circular piece with a diameter of 14 mm, the pre-lithiated film is a diameter of 16.5 mm, and the electrolyte is 1 mole of LiPF 6 (EC / DMC 1:1). The discharge current is 10uA, the cut-off voltage is 4.35V, the test results are as follows image 3 , the capacity is 0.3256mAh, after calculation, the pre-lithiation amount is 0.2115mAh / cm 2 .

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Abstract

The invention discloses a method for detecting the amount of pre-lithiation of a pre-lithiation film, comprising: preparing a negative pole piece, a pre-lithiation film and an aluminum foil; the ratio of the area of ​​the aluminum foil to the area of ​​the pre-lithiation film is 0.5-1; The ratio of the area of ​​the sheet to the area of ​​the pre-lithiated film is 0.5-1; the pre-lithiated film includes a base film of 1um-50um and a pre-lithiated layer of 0.02um-100um coated on the base film; The prepared negative pole piece, pre-lithiated film and aluminum foil are assembled into a button battery; wherein, the pre-lithiated layer is assembled towards the aluminum foil side; the button battery is static, and the static time is 8-32 hours ; Button cell at 1uA / cm 2 -1mA / cm 2 Discharge treatment is carried out under the discharge current density, and the discharge cut-off voltage is between 4.2V-4.7V; read the discharge capacity, and calculate the pre-lithiation amount of the pre-lithiation film.

Description

technical field [0001] The invention relates to the technical field of lithium battery materials, in particular to a method for detecting a pre-lithiation amount of a pre-lithiation film. Background technique [0002] Lithium-ion batteries have been successfully used as the main energy storage device in the field of mobile power because of their high output voltage, high energy density, long cycle life, good safety performance, and no memory effect. In order to further meet the needs of grid energy storage, electric vehicles, and consumer electronics for energy storage devices, electrode materials with longer cycle life, better safety, and higher energy density and lithium battery systems have become research hotspots. [0003] During the working process of a lithium battery, lithium ions shuttle between the positive and negative electrodes. The energy density of lithium batteries largely depends on the amount of active lithium ions in the battery. However, in the current ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/378
CPCG01R31/3644
Inventor 闫昭罗飞李泓
Owner LIYANG TIANMU PILOT BATTERY MATERIAL TECH CO LTD
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