Lithium Battery Basics and Key Process Control Points

This document provides foundational knowledge of lithium-ion batteries, focusing on their basic principles, structure, and critical process control points in manufacturing. It explains the electrochemical reactions using a lithium cobalt oxide-graphite system, detailing the charge and discharge processes. The structure covers positive and negative electrodes, separators, and caps, with specific material compositions and ratios from K-tech, including NMC active material, conductive agents, binders, and current collectors. Key process controls for batching, mixing, coating, and drying are emphasized to ensure quality. Mixing must achieve uniform dispersion of active materials and additives, with strict moisture control and proper dissolution of PVDF and CMC. Coating requires precise thickness uniformity (±3 μm) and careful drying to avoid defects like streaks or active material peeling. Drying temperatures are specified for positive (100-130°C) and negative (75-90°C) electrodes. The document highlights the importance of viscosity, solid content, and equipment standards for reliable battery performance.