Section 1 · Fundamentals
Fundamentals of Lithium-Ion Technology
Before a cell can be specified, abused, charged, or recycled, its operating principle has to be understood from the inside out — how lithium moves, what hosts it, and why the chemistry that won did so.
A lithium-ion cell stores and releases energy by shuttling lithium ions between two intercalation hosts while the compensating electrons travel an external circuit. This is the “rocking-chair” architecture that displaced every rechargeable chemistry before it: lithium is never plated and stripped as a metal in normal operation, only inserted into and extracted from a host lattice, which is what makes the cell both reversible and, with the right materials, durable across thousands of cycles.
Lithium is neither created nor destroyed in a working cell — it is only relocated between electrodes. Every capacity figure, every degradation mechanism, and every safety limit in this course traces back to where that lithium sits and how freely it can move.
What this section covers
The four topics that follow build the foundation in order. The history establishes why intercalation hosts replaced metallic lithium and how the modern cell took shape across two decades. The anatomy identifies the four functional components and the transport role each one plays. The operating-principle topic traces ions and electrons through charge and discharge and introduces the solid-electrolyte interphase that forms on the first cycle. The form-factor topic connects chemistry to mechanical and thermal integration — cylindrical, prismatic, and pouch — which propagates directly into pack design later in the course.
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