Method for analyzing and testing charge-discharge performance and charge-discharge mechanism of lithium battery

Abstract

The invention relates to a method for analyzing and testing the charge-discharge performance and charge-discharge mechanism of a lithium battery. The method is technologically characterized by comprising the following steps: S1, making electrode active material particles into lithium battery electrodes, and assembling the lithium battery electrodes into a lithium battery; S2, preprocessing the lithium battery; S3, testing the charge-discharge performance of the lithium battery under different temperatures and currents; S4, setting cut-off points of the lithium battery charge-discharge process; S5, dismantling the lithium battery and stripping the electrodes in an inert gas environment; S6, making a X-ray diffraction analysis of the lithium battery electrodes under different cut-off points, and detecting the change in charge-discharge product of the lithium battery electrodes; and S7, deducing the mechnism of electrode reaction according to reaction mechanism equations of different cut-off points. The change of the active material in the charge-discharge process and the degree the electrochemical reaction reaches can be judged effectively, and the charge-discharge reaction mechanism of the battery can be studied.

Description

technical field [0001] The invention belongs to the technical field of lithium battery charge and discharge testing, and relates to lithium battery testing technology and staged characterization analysis technology, in particular to an analysis and testing method for lithium battery charging and discharging performance and charging and discharging mechanism. Background technique [0002] At present, lithium batteries have become a very promising new energy carrier due to their advantages such as small size, large capacity and stable working voltage. An in-depth understanding of the internal working principle of lithium batteries, the changes of active substances and the degree of reaction during the charging and discharging process of the battery is an important link in the design and development of lithium batteries. In the process of developing and preparing lithium batteries, it is necessary to analyze and test the performance of lithium batteries and the working principl...

AI Technical Summary

Problems solved by technology

[0003] However, X-ray diffractometers and in-situ X-ray diffractometers currently on the domestic market cannot effectively detect product changes in electrodes at different charging and discharging stages at different temperatures

The reason is: on the one hand, (in-situ) X-ray diffractometers are independent instruments and equipment, which cannot cooperate with battery testing equipment of different models and high and low temperature test chambers; on the other hand, X-rays cannot penetrate the battery casing and Characterize the Electrode Product

[0004] According to foreign literature, the existing in-situ X-ray diffractometers that can test electrode products are all self-designed and modified personalized testing equipment, which are not only expensive but also not universal.

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