A kind of production method of high elongation lithium ion battery aluminum foil

Abstract

The invention discloses a production method of aluminum foil for lithium ion batteries with high elongation rate, which is composed of the following components in weight percent: 0.07-0.086% Si; 1.45-1.55% Fe; 0.003-0.0055% Cu; 0.025-0.0293% % of Mn;≤0.0008% of Mg; 0.024%-0.03% of Zn; 0.02-0.025% of Ti; the balance is Al and unavoidable impurities; the single weight content of impurities is not more than 0.03%. The steps in turn include: first melting and casting the raw material, sawing, milling, and then waiting for annealing, then performing continuous rolling such as hot rolling, cold rough rolling, and cold finish rolling to obtain a billet, and the billet is trimmed, foil rolled, trimmed again, and finally obtained Finished aluminum foil. The aluminum foil for lithium-ion batteries produced in this case has the advantage of high elongation, which provides high-quality raw materials for the continuous thinning of lithium batteries and the production of high-energy-density power battery substrates.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a production method of 8021 alloy aluminum foil for a positive electrode collector of lithium ion batteries. Background technique [0002] Lithium-ion batteries have outstanding advantages such as large specific energy, high cycle stability, low self-discharge rate, no memory effect, clean and pollution-free, etc., and are the secondary battery system with the best comprehensive performance at present; It has completely replaced nickel-cadmium and nickel-metal hydride batteries, and large-capacity lithium-ion power batteries also have a strong momentum to replace lead-acid batteries in aerospace, transportation and other intermittent clean energy storage fields. Lithium-ion batteries use aluminum foil as the positive electrode collector. With the continuous expansion of the lithium-ion battery market, it has become an emerging consumer market with great ...

AI Technical Summary

Problems solved by technology

At present, most of the aluminum foils for lithium-ion batteries on the market use 1-series and 3-series alloys. Although the tensile strength is good, the elongation is low, and the problem of tape breakage is prone to occur in the coating and rolling processes of battery production, which cannot meet the needs of lithium batteries. High elongation requirements for aluminum foil in the process of continuous thinning and increasing energy density

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