Overview
Synthetic graphite is a man-made carbon material produced by high-temperature treatment of carbon-rich precursors like petroleum coke or coal tar pitch. Unlike natural graphite, its structure and purity can be precisely controlled during manufacturing. First developed in the late 19th century, synthetic graphite now accounts for over 60% of global graphite consumption in industrial applications. Its consistent quality makes it preferable for high-tech uses where natural graphite variability is unacceptable.
Physical and Chemical Properties
Synthetic graphite exhibits anisotropic thermal conductivity (higher parallel to grain orientation) and electrical resistivity of 5-10 μΩ·m. Its layered structure provides inherent lubricity with a friction coefficient of 0.1-0.2. Chemically inert up to 500°C in non-oxidizing environments, it withstands most acids except strong oxidizers. The material's porosity (typically 15-25%) and specific surface area (1-20 m²/g) vary by production method. Grades for lithium-ion batteries undergo additional processing to achieve >99.9% purity.
Main Applications
Over 70% of synthetic graphite supplies lithium-ion battery anodes, where its stable intercalation structure enables 300+ charge cycles. The steel industry uses large electrodes (1-3m diameter) for electric arc furnaces, consuming 400-700kg per ton of steel. Other key uses include: high-temperature crucibles (up to 3000°C), mechanical seals and bearings (dry lubrication), nuclear reactor moderators (high-purity grades), and conductive fillers in polymers. Emerging applications include fuel cell components and graphene production precursors.
Safety and Storage
As a non-flammable solid, synthetic graphite poses minimal fire risk but dust clouds may explode at concentrations >50g/m³. NFPA recommends local exhaust ventilation for powder handling areas. Store bulk material in sealed containers to prevent moisture absorption (affects electrical properties). Powdered grades require antistatic packaging during transport. Dispose according to local regulations, though most forms are non-hazardous waste. Workers should use NIOSH-approved N95 masks when generating airborne particles.
B2B Procurement Guide
Industrial buyers should specify: crystallinity (measured by d002 spacing), particle size distribution (D50 typically 5-30μm for batteries), tap density (>0.9g/cm³ for electrode pastes), and impurity limits (Fe <50ppm for electronics). Major producers include SGL Carbon (Germany), Tokai Carbon (Japan), and GrafTech (USA). Spot prices fluctuate with petroleum coke costs. For large orders (>20MT), negotiate quarterly contracts with purity-based pricing tiers. Lead times range from 4 weeks (standard grades) to 12 weeks (custom formulations).
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