Silicon gives a lithium-ion anode ten times more capacity than graphite — and for just as many years the industry has been unable to use it properly: on charge it swells more than 300%, cracks, and loses contact with the electrode, so capacity drops within a few hundred cycles.
The fix is expensive nanostructured composites (Group14, Sila and similar) — up to $400/kg against $25/kg for graphite, 8–16 times pricier, and even then expansion isn’t solved, more a compromise.
The anode material market is $11 billion in 2026, reaching $81 billion by 2030 at 33.6% growth a year. Ten percent of anode mass in premium composite at one gigafactory (40 GWh/year) is more than $270 million a year for material that still degrades. Outside warranty, an EV owner pays $12,000–22,000 to replace the battery. The money is spent twice: the manufacturer on a composite that cracks anyway, the owner on a battery that didn’t last its rated life.
ARBOK solved the problem in a fundamentally different way, replacing the carbon base with graphene — with TEGA, ARBOK’s own thermally expanded graphite: a porous graphene matrix, specific surface area 2,400–3,600 m²/g, hundreds of times higher than ordinary graphite (5–20 m²/g). Standard silicon lives in the pores instead of a binder film: expansion is absorbed mechanically, and the frame itself holds contact and conductivity.
The point: TEGA replaces not the silicon, but its expensive engineering. Nanostructuring and pre-lithiation ($200–400/kg) exist only so silicon can withstand expansion on its own. In TEGA the matrix absorbs it — ordinary silicon at feedstock price ($15–40/kg) works fine, at cycle life matching the best premium solutions for a fraction of the cost.
High surface area gives silicon a fine, even distribution in the pores — and that holds the cycle, not the area itself. Over 1,500 cycles above 85% retention, against roughly 260 cycles at 57–72% for simple mixing without buffering.
Production: a mobile ARBOK unit makes TEGA on site — up to 1 t/h, from natural intercalated graphite, no factory, no logistics — straight into the gigafactory’s anode line.
Economics. TEGA is $50/kg, 99.98% pure, made on site — against $200–400/kg imported. The difference is $150–350 per kg of anode where premium powder used to sit. The ARBOK business model is a BOOM/offtake with cell makers over 15–20 years, with volumes and prices locked in, plus a franchise of BOO modules with payback of 5–7 years.
Global effect of TEGASi: at today’s capacity (2,500 GWh/year), saving more than $14 billion a year on composite; by 2036, at 5,000 GWh, more than $28 billion. By region, over 75% of that volume is China, where cell production is concentrated. The EU and US are building gigafactories while gaining independence from imports — a TEGASi site on location closes both: price and supply chain.
The industry has spent years paying for chemistry that masks silicon’s problem. ARBOK solved it with construction.