A kind of preparation method of current collector for lithium ion battery

Abstract

The invention discloses a preparation method of a current collector for a lithium ion battery. The preparation method comprises the following steps: (1) polyoxometallic acid lithium salt solution and conductive polymer monomer solution are respectively prepared according to a mole ratio of 1: (1-9); (2) one surface of an aluminum foil is covered with insulation cloth, and the other surface is connected with a negative electrode of a direct-current power supply; a positive electrode of the direct-current power supply is connected with a counter electrode; and the two electrodes are put in the prepared conductive polymer monomer solution; and (3) the direct-current power supply is switched on for electrifying; the prepared polyoxometallic acid lithium salt solution is added in the conductive polymer monomer solution for reaction by 1-24 hours at room temperature; the electroplated aluminum foil is washed by using distilled water and alcohol; and then, the washed aluminum foil is put in a 40-200 DEG C drying box for drying by 2-10 hours to obtain the current collector. The lithium ion transmission characteristics are improved, and the electron transmission characteristics are improved through conductive polymers, so that the dual requirements of composite materials on lithium ion transmission and electron transmission are met.

Description

technical field [0001] The invention relates to the technical field of lithium batteries, in particular to a method for preparing a 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 has the advantages of thermal stability and safety compared with other positive electrode ...

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.