ADVANCED MATERIALS & PROCESSES | NOVEMBER 2026 16 Carbon is an extraordinary element, often called the “king of elements.” It is no surprise then, that engineered materials made of carbon are extraordinary—materials that are light, strong, tough, and stable at high temperature. The unique physical and chemical properties of graphite materials have made them absolutely essential for energy storage, energy generation, electronics, and extreme applications. What is also extra- ordinary is the story of how engineered graphite went from invention to indispensable in the last 130 years. Today, graphite in application touches many materials, enabling broad technological success, but its vital role has not been as publicly visible as other materials. Furthermore, graphite remains misunderstood as an engineered material. In fact, there is not just one graphite. Strictly speaking, graphite is a crystal structure of elemental carbon, but practically speaking, graphite materials are a large category of complex composite materials that vary in form factor, bulk density, bulk isotropy, extent of graphitization, purity, and other properties. For form factor, bulk articles and powders are common, but graphite materials are also made into fibers, foils, and films, among others. Graphite materials are not just a composition of polycrystalline grains, but their structure is polygranular, multiscale, and heterogenous. On one side, natural graphite is mined from the Earth, and its most common form is as flakes that can be processed into powders and foils or used in refractories, friction materials, and energy storage. On the other side, synthetic or engineered graphite materials are formed sequentially and irreversibly from controlled heat treatment of carbonaceous precursors and have a different structure from natural graphite (Figs. 1 and 2). Synthetic graphite requires high-quality carbonaceous materials like petroleum coke and coal tar and petroleum pitch (Figs. 3-5). A review of the literature shows no clear classification of graphite materials, ambiguous and inconsistent terminology, poor interchangeability, and no established structure-property relationships. It is easy to see why there is wide confusion. It is from this vantage point that the motivation for this article is set. Fig. 1 — Example routes for bulk article processing of synthetic graphite, and primary powders from synthetic and natural routes. Fig. 2 — Examples of lithium-ion battery grade natural graphite (left) and synthetic graphite (right) active anode materials. Fig. 3 — Petroleum needle coke, a precursor for synthetic graphite (left). Microstructure of needle coke showing oriented and aligned structure (right).
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