Detection method for analyzing interfacial electrical properties of carbon-coated foil

Abstract

The invention discloses a detection method for analyzing the interfacial electrical properties of a carbon-coated foil. The detection method comprises the following steps: S1, preparation of experimental batteries; S2, formation of the experimental batteries; S3, measurement of the electrochemical impedance spectra of the experimental batteries; and S4, fitting of the impedance spectra of the experimental batteries: carrying out fitting on an impedance spectrum-Nyquist curve by using the measuring software Zahner-4.12USB and the fitting circuit LR (QR) (Q(RW)), and analyzing the influence of an coated-carbon aluminum foil on battery performance through analyzed impedance components. The invention has the beneficial effects that the internal charge transfer resistance of a positive electrode material is analyzed through fitting of the impedance spectra, and the interfacial electrical properties of an aluminum foil-positive electrode material are determined according to the internal charge transfer resistance, so rapid screening can be carried out on raw materials for lithium ion batteries.

Description

technical field [0001] The invention relates to the field of lithium ion batteries, in particular to a detection method for analyzing the interface conductivity of carbon-coated foil materials. Background technique [0002] At present, lithium-ion batteries, as the preferred power battery for pure electric vehicles, have been produced and used on a large scale. The active material in the positive electrode material of the lithium-ion battery is a semiconductor, and a conductive agent needs to be added to form a conductive network. By increasing the electronic conductivity of the positive electrode sheet and reducing the polarization of the positive electrode, the charge and discharge performance of the battery can be improved. The current collector of the positive electrode of the battery is aluminum foil, which is connected by a binder and a conductive network. At present, foil manufacturers apply carbon powder to the surface of the aluminum foil to improve the conductivity...

AI Technical Summary

Problems solved by technology

Battery manufacturers often evaluate battery raw materials through the electrochemical performance of batteries, and lack sufficient understanding of how the conductivity of the aluminum foil-positive electrode material interface affects battery performance. Therefore, there is no unified evaluation standard for the actual performance of carbon-coated aluminum foil before battery production.

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