How the lithium-ion battery supply chain works

01Raw materials and mining

The supply chain begins in the earth. Lithium is extracted from hard-rock spodumene deposits in Australia or brine pools in Chile, Argentina, and Bolivia. Cobalt comes predominantly from the Democratic Republic of Congo, nickel from Indonesia and the Philippines, graphite from China, and manganese from South Africa and Gabon.

Each mineral follows its own logistics path. Brine evaporation can take up to two years; hard-rock mining is faster but energy-intensive. The geographic concentration of these resources creates the first layer of vulnerability in the chain.

02Refining and chemical processing

Raw ore is not usable in batteries. Lithium must be refined into battery-grade lithium carbonate or lithium hydroxide. Cobalt is processed into sulfate, nickel into sulfate or hydroxide, and graphite is purified to spherical form. These conversion steps require significant chemical expertise and energy.

China dominates refining capacity for nearly every battery mineral, processing roughly 65 to 80 percent of the world's battery-grade materials. This concentration means that even minerals mined elsewhere often travel to China before reaching a cell factory.

03Cell component manufacturing

Refined materials become active components. Cathode powders are mixed with binders and coated onto aluminum foil. Anode materials, primarily graphite, are coated onto copper foil. Separators, thin polyethylene or polypropylene membranes, are produced to keep the electrodes apart while allowing ion transport.

The electrolyte, a lithium salt dissolved in organic solvents, is manufactured separately. Each component requires tight specifications on particle size, coating thickness, and chemical purity. Small deviations here propagate as performance losses or safety risks downstream.

04Cell assembly and formation

In the cell factory, electrodes are wound or stacked with the separator, inserted into a casing, and filled with electrolyte. The cell then enters formation: a controlled first charge that establishes the solid electrolyte interphase layer on the anode. This layer is critical for long-term stability.

Formation takes days and consumes significant energy. After formation, cells are aged and tested for capacity, internal resistance, and self-discharge. Cells that fail any check are rejected. Yield rates in mature factories exceed 95 percent, but reaching that level requires years of process optimization.

05Pack assembly and integration

Individual cells are welded into modules, and modules are assembled into packs with a battery management system that monitors voltage, temperature, and state of charge. The pack is engineered for thermal management, crash protection, and electrical isolation.

Pack design varies by application. A phone pack is small and sealed. An electric vehicle pack may contain thousands of cells in a liquid-cooled structure that weighs hundreds of kilograms. Grid storage packs prioritize cost and longevity over weight and volume.

06Distribution and end-use

Finished packs ship to automakers, electronics manufacturers, and energy storage operators. The end-use phase can last eight to fifteen years depending on the application. During this time, the battery degrades gradually, losing capacity with each charge cycle.

Distribution logistics are complex. Batteries are classified as dangerous goods for shipping, requiring specialized packaging and handling. Regional regulations differ, adding cost and delay to cross-border movements.

07Recycling and the circular loop

When batteries reach end of life, they enter recycling. Current processes include pyrometallurgy, which smelts the pack to recover cobalt and nickel but loses lithium, and hydrometallurgy, which dissolves the black mass in acid to recover individual metals with higher efficiency.

Direct recycling, an emerging approach, attempts to recover cathode material without breaking it down to elements. Recycling closes the loop by returning recovered metals to the refining stage, reducing dependence on primary mining. However, collection rates remain low, and economics are challenging when virgin materials are cheap.