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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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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI 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 negative electrodes made of different sizes of negative materials and copper foils to replace the traditional pure lithium negative electrodes, and a positive electrode with a certain amount of coating The battery performance of the button battery is used to evaluate the battery performance of the lithium-ion full battery with high accuracy; the button battery can also test and evaluate a series of full batteries with different positive electrode coatings, saving a lot of testing resource

Method used

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

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Experimental program
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Effect test

Embodiment 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 elect...

Embodiment 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 electro...

Embodiment 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...

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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.

Description

technical field [0001] The invention relates to the field of lithium ion batteries, in particular to a method for evaluating the performance of a soft-pack lithium ion full battery by using a button-type half battery. Background technique [0002] The button half-cell with metal lithium as the counter electrode has aroused extensive interest in the research of lithium-ion batteries and has become an important research method used in the development of lithium-ion power battery products. However, due to the characteristics of the button half-cell component and the existence of the full battery It is obviously different, including that the counter electrode in the button-type half-cell is a pure lithium sheet (the full-cell is mainly made of graphite and other materials), and the ratio of electrolyte addition is higher than that of the full-cell. These factors will significantly affect the soft-pack lithium-ion full-cell. The performance of the new material is verified by coin...

Claims

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Application Information

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IPC IPC(8): G01R31/378G01R31/385G01R31/387H01M10/058H01M10/0525
CPCG01R31/378G01R31/385G01R31/387H01M10/058H01M10/0525Y02P70/50
Inventor 宫娇娇陈军黄建根郑利峰
Owner WANXIANG 123 CO LTD
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