Lithium Battery Basics & Key Process Control Points

This document provides foundational knowledge of lithium-ion batteries, covering their basic principles, structure, and key process control points. It explains the electrochemical reactions in a lithium cobalt oxide-graphite system, detailing the positive and negative electrode reactions. The structure of lithium-ion batteries is broken down into components: positive electrode (active material, conductive agent, binder, aluminum foil), negative electrode (active material, conductive agent, thickener, binder, copper foil), separator (polyolefin types like PP, PE, and PP/PE/PP), and cap. Key process control points focus on mixing and slurry preparation, emphasizing raw material requirements, moisture control, PVDF and CMC dissolution, and slurry uniformity. Coating and drying processes are critical, requiring precise thickness control (±3 um), proper drying temperatures (100-130°C for positive, 75-90°C for negative), and avoidance of defects like streaks and dark marks. The document highlights the importance of viscosity, solid content, and equipment precision for high-quality battery manufacturing.