Preparation method of positive current collector for lithium ion battery

Abstract

The invention discloses a preparation method of a positive current collector for a lithium ion battery. The preparation method comprises the following steps of immersing an aluminum foil in 3-amino propyl trimethyl silane; taking out the aluminum foil, immersing the aluminum foil in an HC1 solution, taking out the aluminum foil, immersing the aluminum foil in a sodium polystyrenesulfonate solution, taking out the aluminum foil, immersing the aluminum foil in a conductive polymer monomer solution, taking out the aluminum foil, immersing the aluminum foil in a polyoxometallic acid lithium salt solution, taking out the aluminum foil, washing and drying the aluminum foil, and fabricating to the positive current collector. With the positive current collector prepared according to the method, the defect that only the electron transmission speed can be increased by a traditional intaglio printing method is made up, the internal resistance and the polarization of a lithium iron phosphate system battery are favorably reduced, and the electrical performance of the lithium iron phosphate battery is further improved.

Description

technical field [0001] The invention relates to the technical field of lithium batteries, in particular to a preparation method of a positive electrode current collector for lithium ion batteries. Background technique [0002] Lithium battery, as an effective energy conversion and energy storage device, has attracted much attention since its invention. Its characteristics of high working voltage, high energy density, high specific energy, high specific power, stable discharge, and no memory effect are widely used in Various electronic products. Although lithium batteries have achieved great success in 3C products, they are still in their infancy in the fields of power applications and energy storage. The key factor restricting their development is composite materials. At present, the cathode materials mainly used in the fields of power and energy storage are Lithium iron phosphate. Lithium iron phosphate power battery has been greatly developed in the field of electric veh...

AI Technical Summary

Problems solved by technology

The method adopted in the above-mentioned patent is similar to the mainstream gravure printing method in the lithium battery industry. It is to coat a layer of conductive material on the current collector to improve the conductivity. This method can be used to make up for the lack of conductivity of the positive active material itself. , it can improve its conductivity to a certain extent, but it can only increase the transmission speed of electrons, but cannot increase the transmission speed of lithium ions inside the lithium battery, and has a limited effect on reducing the internal resistance and polarization of the battery.