Method for determining cycle performance of lithium ion battery

A lithium-ion battery and cycle performance technology, which is applied in the field of lithium-ion battery production and material selection, can solve the problems of structural changes in active materials, different service life of secondary batteries, and long time consumption, and achieve the effect of simplifying the judgment process and simple calculation

Active Publication Date: 2015-05-27
SHENZHEN BAK POWER BATTERY CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing lithium-ion battery cycle performance test requires the production of finished batteries, which are repeatedly charged and discharged on special equipment for cycle performance testing, which is costly and time-consuming.
[0004] There are many studies on the life decay mechanism of lithium-ion batteries. The factors leading to the life decay of lithium-ion batteries include the reaction between the positive electrode material and the electrolyte, the reaction between the electrolyte and the negative electrode material, and the interaction between the electrolyte foil. Reaction, the repeated charge and discharge activities inside the battery cause the structure of the active material to change or fall off, so the service life of the secondary battery corresponding to the use of different negative electrode materials is also different.

Method used

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  • Method for determining cycle performance of lithium ion battery
  • Method for determining cycle performance of lithium ion battery
  • Method for determining cycle performance of lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0072] 1. To measure the XRD of the selected anode material, please refer to figure 1 The ray diffraction (XRD) test spectrum of negative electrode material shown, and draw interlayer spacing by interlayer spacing calculation formula (referring to formula 1-7), the interlayer spacing in embodiment one is 0.3358 nanometers, can be obtained by formula or by XRD directly calculated by the software;

[0073] 2. Weigh 100 grams of graphite, 2.5 grams of conductive agent, 1.5 grams of dispersant and 4 grams of thickener and dissolve them in a certain amount of water, and then apply them as required. After baking, the negative electrode sheet A required for the experiment is obtained. ;

[0074] 3. Weigh a certain amount of metal lithium sheet in proportion, remove the oxide layer on the surface as the counter electrode B, and assemble it with the pole piece A to form a half-cell for cycle performance testing. The cycle performance curve is as follows Figure 5 shown.

Embodiment 2

[0076] 1. To measure the XRD of the selected anode material, please refer to figure 2 The ray diffraction (XRD) test spectrum of negative electrode material shown, and draw interlayer spacing by interlayer spacing calculation formula (referring to formula 1-7), the interlayer spacing among the embodiment two is 0.3361 nanometer, can be obtained by formula or by XRD directly calculated by the software;

[0077] 2. Weigh 100 grams of graphite, 2.5 grams of conductive agent, 1.5 grams of dispersant and 4 grams of thickener and dissolve them in a certain amount of water, and then apply them as required. After baking, the negative electrode sheet A required for the experiment is obtained. ;

[0078] 3. Weigh a certain amount of metal lithium sheet in proportion, remove the oxide layer on the surface as the counter electrode B, and assemble it with the pole piece A to form a half-cell for cycle performance testing. The cycle performance curve is as follows Figure 6 shown.

Embodiment 3

[0080] 1. To measure the XRD of the selected anode material, please refer to image 3 The ray diffraction (XRD) test pattern of negative electrode material shown, and draw interlayer spacing by interlayer spacing calculation formula (referring to formula 1-7), the interlayer spacing among the embodiment three is 0.3364 nanometers, can be obtained by formula or by XRD directly calculated by the software;

[0081] 2. Weigh 100 grams of graphite, 2.5 grams of conductive agent, 1.5 grams of dispersant and 4 grams of thickener and dissolve them in a certain amount of water, and then apply them as required. After baking, the negative electrode sheet A required for the experiment is obtained. ;

[0082] 3. Weigh a certain amount of metal lithium sheet in proportion, remove the oxide layer on the surface as the counter electrode B, and assemble it with the pole piece A to form a half-cell for cycle performance testing. The cycle performance curve is as follows Figure 7 shown.

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Abstract

The invention relates to a method for determining the cycle performance of a lithium ion battery, which comprises the following steps of: detecting and acquiring a physical performance index of a cathode material of the lithium ion battery; determining a layer distance of the cathode material according to the physical performance index; and establishing a calculating relation between the layer distance and the charge and discharge cycle times of the lithium ion battery. By the method, the charge and discharge cycle times of the lithium ion battery can be quickly predicted, the cycle performance of the battery can be obtained under the conditions that the cathode material is not made into the battery and actual charge and discharge operation is not performed, the testing time of the cycle performance of the battery is greatly shortened, the testing cost of the cycle performance of the battery is greatly saved, and the cathode material is more convenient to select, so that the lithium ion battery with longer service life is manufactured.

Description

technical field [0001] The invention relates to the production and selection of lithium-ion batteries, in particular to a method for simply and quickly judging the cycle performance of lithium-ion batteries. Background technique [0002] With the wide application and rapid development of various portable electronic devices and electric vehicles, the demand and performance requirements for chemical power sources have also increased accordingly. Lithium-ion batteries are widely used in mobile electronic terminal devices due to their high power characteristics and no memory effect. field. [0003] The existing lithium-ion battery cycle performance test is generally to make the selected negative electrode material and positive electrode material into a finished battery and then conduct an actual charge-discharge cycle performance test. Chinese patent application 200620151415.X discloses a method for testing the cycle performance of a finished battery The equipment includes a ba...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/36G01N23/207
Inventor 安伟峰何伟何名
Owner SHENZHEN BAK POWER BATTERY CO LTD
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