Lithium Battery Coating Process: Current Collector Basics

This document provides a basic training on the lithium battery coating process, focusing on current collectors. It explains that current collectors, typically metal foils like aluminum and copper, support electrode materials and collect current for external output. Aluminum foil is used for positive electrodes due to its protective oxide layer at high potentials, while copper foil is used for negative electrodes to avoid oxidation. The document details properties of aluminum foil, including alloy types, surface conditions, and temper states, emphasizing strength, toughness, and corrosion resistance. Copper foil is classified into rolled and electrolytic types, with electrolytic being dominant due to cost and productivity. Both foils must have good mechanical properties, adhesion, and conductivity. The document also introduces surface treatment using functional coatings, such as carbon-coated foils, to enhance static conductivity and reduce internal resistance, improving battery performance and charge-discharge efficiency.