A kind of manufacturing process of aluminum foil and positive current collector

Abstract

The invention relates to the technical field of aluminum foils, in particular to a manufacturing process of an aluminum foil and a positive current collector, and the manufacturing process of the aluminum foil comprises the following steps: (1) cleaning the surface of the aluminum foil with deionized water; (2) performing alternating-current energization on the aluminum foil, soaking the aluminumfoil in an acid medium, and performing ultrasonic oscillation on the acid medium in the soaking process, wherein the corrosion time is 10-14 min. Traditional dichromate is not adopted to corrode the aluminum foil, but the hydrochloric acid and sulfuric acid composite solution is adopted; hydrochloric acid has high corrosion capacity on the aluminum foil, so more micropores can be formed in the surface of the aluminum foil; and sulfuric acid with the passivation effect on aluminum and acetic acid and polyethylene glycol with the slow release function are adopted, so the generated micropores canbe more regular, and pore size distribution is relatively narrow; moreover, ultrasonic and alternating current energization effects are employed for assistance, so the aluminum foil has high porosityand keeps good mechanical strength at the same time.

Description

technical field [0001] The invention relates to the technical field of aluminum foil, in particular to a manufacturing process of aluminum foil and a positive current collector. Background technique [0002] New materials and clean energy are both key development directions at the national level. Lithium-ion batteries are currently the most widely used energy storage cells in energy storage technology. Improving the energy storage density of cells is the goal pursued by the world. The energy density of cells is The improvement mainly depends on the development and progress of its positive and negative electrode materials, but it is also related to the progress of the positive and negative electrode current collectors, positive and negative electrode binders, electrolytes and separators of lithium-ion batteries. [0003] The current collector used in the positive electrode of lithium-ion batteries is generally composed of aluminum foil and the positive electrode powder (lithi...

AI Technical Summary

Problems solved by technology

Traditional current collector materials generally use aluminum foil with a smooth surface, and the aluminum foil with a purity of 99.7% is used to directly coat the active material. High, in the process of processing and charging and discharging, the phenomenon of active material falling off or powder falling is easy to occur, which reduces the cycle charging and discharging efficiency and battery life, increases the contact resistance between components, and leads to a decrease in the conductivity of the positive plate, thus affecting the battery life. Comprehensive performance

Seriously affect the comprehensive performance of lithium ions

At present, people generally use the method of roughening the surface of aluminum foil to increase the bonding force between aluminum foil and positive electrode powder, but this process cannot achieve the desired effect.