Method for evaluating performance of soft package lithium ion total battery by using button type half battery

A half-cell, lithium-ion technology, which is applied in the field of evaluating the performance of soft-pack lithium-ion full-cells, can solve the problems of lack of limited connection, reduced data reliability, etc., to achieve good practicability, saving test resources, and high test accuracy. Effect

Pending Publication Date: 2022-05-27

WANXIANG 123 CO LTD

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AI-Extracted Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to overcome the lack of limited connection between button batteries and soft-pack lithium-ion full batteries in the prior art, resulting in technical deviations and risks in the performance evaluation results of button batteries, reducing data reliability, and delaying product development efficiency. , to provide a method for evaluating the performance of a soft-packed lithium-ion full battery with a button-type half-cell, by selecting neg...

Abstract

The invention relates to the field of lithium ion batteries, and discloses a method for evaluating the performance of a soft-package lithium ion total battery by using button half batteries, which comprises the following steps of: manufacturing a positive plate, manufacturing a negative plate, combining and compacting to respectively manufacture two-system button half batteries and three-system button half batteries, and testing the battery performance of the manufactured button half batteries. By setting the electrolyte injection ratio and the coating surface density and selecting the negative electrode combination of the negative electrode material and the copper foil with different sizes, the prepared button type half cell can accurately reflect the battery performance of the lithium ion total battery, the data reliability of the button type half cell is improved, a series of total batteries with different positive electrode coating amounts can be evaluated, and the battery performance of the lithium ion total battery is improved. A large number of test resources are saved, the test method also has good applicability in a three-electrode system, and the difference between evaluation results of the button type half-battery lithium ion total battery is shortened.

Application Domain

Final product manufactureElectrical testing +1

Technology Topic

Copper foilLithium electrode +7

Image

Examples

Experimental program(8)
Comparison scheme(12)
Effect test(1)

Example Embodiment

[0033] Example 1:

[0034] A) Production of positive electrode sheet: NCM811 ternary layered material: carbon nanotubes: polyvinylidene fluoride in a ratio of 85:7.5:7.5 and then coated on 18μm aluminum foil with a coating amount of 100g/m 2 , at 3.2g/cm after coating and drying 3 Compaction at the compaction density of 1.2 cm in diameter to make a circular positive electrode sheet;

[0035]B) Making a negative electrode sheet: a 50 μm thick lithium sheet layer and a 200 μm thick copper foil are pressed under an argon atmosphere of 40 standard atmospheres to make a circular negative electrode sheet with a diameter of 1.4 cm, which is used as a counter electrode;

[0036] C) Assemble a button-type half-cell with a two-electrode system in the order of negative electrode sheet, diaphragm, and positive electrode sheet, and inject 110 μL of electrolyte into the button-type half-cell; Assemble a button-type half-cell with a three-electrode system in the order of 3-electrode, and inject 110 μL of electrolyte into the button-type half-cell;

[0037] D) Place the battery prepared in step C) at room temperature for 4.5 hours, set N/P to 1.14, charge and discharge at a voltage of 3.6V at a rate of 0.1C for 3 weeks, and record the discharge capacity in the third week as the standard capacity of the battery, It was then cycled at a voltage of 3.6 V at a rate of 0.5 C for 300 cycles at room temperature, and the battery capacity retention rate = 300th cycle discharge capacity/1st cycle discharge capacity was recorded.

Example Embodiment

[0038] Example 2:

[0039] A) Production of positive electrode sheet: NCM811 ternary layered material: carbon nanotubes: polyvinylidene fluoride in a ratio of 80:10:10 and then coated on 20μm aluminum foil with a coating weight of 75g/m 2 , at 3.0g/cm after coating and drying 3 Compaction at the compaction density of 1.0cm in diameter to make a circular positive electrode sheet;

[0040] B) Making a negative electrode sheet: a 55 μm thick lithium sheet layer and a 195 μm thick copper foil are pressed under an argon atmosphere of 100 standard atmospheres to make a circular negative electrode sheet with a diameter of 1.2 cm, which is used as a counter electrode;

[0041] C) Assemble a button-type half-cell with a two-electrode system in the order of negative electrode sheet, diaphragm, and positive electrode sheet, and inject 110 μL of electrolyte into the button-type half-cell; Assemble a button-type half-cell with a three-electrode system in the order of 3-electrode, and inject 110 μL of electrolyte into the button-type half-cell;

[0042] D) Place the battery prepared in step C) at room temperature for 3 hours, set N/P to 1.1, charge and discharge at a voltage of 2.8V at a rate of 0.08C for 3 weeks, and record the discharge capacity in the third week as the standard capacity of the battery, It was then cycled at a voltage of 2.8 V at a rate of 0.4 C for 300 cycles at room temperature, and the battery capacity retention rate = 300th cycle discharge capacity/1st cycle discharge capacity was recorded.

Example Embodiment

[0043] Example 3:

[0044] A) Production of positive electrode sheet: NCM811 ternary layered material: carbon nanotube: polyvinylidene fluoride in a ratio of 90:5:5 and then coated on 15μm aluminum foil with a coating weight of 125g/m 2 , at 3.3g/cm after coating and drying 3 Compaction at the compaction density of 1.4cm in diameter to make a circular positive plate;

[0045] B) Making a negative electrode sheet: a 45 μm thick lithium sheet layer and a 205 μm thick copper foil are pressed under an argon atmosphere of 20 standard atmospheres to make a circular negative electrode sheet with a diameter of 1.6 cm, which is used as a counter electrode;

[0046] C) Assemble a button-type half-cell with a two-electrode system in the order of negative electrode sheet, diaphragm, and positive electrode sheet, and inject 110 μL of electrolyte into the button-type half-cell; Assemble a button-type half-cell with a three-electrode system in the order of 3-electrode, and inject 110 μL of electrolyte into the button-type half-cell;

[0047] D) Place the battery obtained in step C) at room temperature for 6 hours, set N/P to 1.17, charge and discharge at a voltage of 4.3V at a rate of 0.12C for 3 weeks, and record the discharge capacity in the third week as the standard capacity of the battery, It was then cycled at a voltage of 4.3 V at a rate of 0.6 C at room temperature for 300 cycles, and the battery capacity retention rate = 300th cycle discharge capacity/1st cycle discharge capacity was recorded.

PUM

Property	Measurement	Unit
Thickness	15.0 ~ 20.0	µm
Thickness	12.0 ~ 20.0	µm
Thickness	200.0	µm

Description & Claims & Application Information

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Classification and recommendation of technical efficacy words

Improve test accuracy
improve accuracy

Method for evaluating performance of soft package lithium ion total battery by using button type half battery

AI-Extracted Technical Summary

Problems solved by technology

Abstract

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Examples

Example Embodiment

Example Embodiment

Example Embodiment

PUM

Description & Claims & Application Information

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