Lithium Battery Coating Process: Current Collector Basics

This document provides a basic training on lithium battery coating processes, focusing on current collectors. It introduces current collectors as metal foils (aluminum for positive electrodes, copper for negative) that support electrode materials and collect current. Aluminum foil is chosen for its stability at high positive potentials due to a protective oxide layer, while copper foil is used for negative electrodes due to its low lithium intercalation. The document details aluminum foil types (alloy series, surface finish, temper) and requirements like strength, toughness, and corrosion resistance. Copper foil is divided into rolled and electrolytic types, with electrolytic dominating 90% of the market; its surface has shiny and matte sides. Both foils must have good mechanical properties, uniform coating adhesion, and electrical conductivity. The document also mentions surface treatment using functional coatings like carbon-coated foils to enhance performance, representing an innovation in battery technology.