The world is running out of graphite, and the most popular solution is to burn a lot of natural gas. Synthetic graphite, the high-purity stuff needed for lithium-ion battery anodes, is made by heating petroleum coke to nearly 3,000 degrees Celsius for weeks. It’s energy-intensive, expensive, and often made in China. The alternative, mined graphite, has its own supply chain and environmental headaches. So the bet at Carbion, a 2025 startup, is that you can skip the mine and the blast furnace by starting with a pile of wood chips.
Carbion’s process, according to its member page at Greentown Labs, is a catalytic thermochemical conversion that turns biomass into battery-grade graphite at less than half the temperature of the synthetic method, and in about a day instead of weeks or months [Greentown Labs, 2025]. The pitch is straightforward: slash the energy cost, use a domestic and renewable feedstock, and give battery makers a cheaper, faster, and more secure source of a critical material. It’s a classic climate tech wedge,find a messy, expensive industrial process and try to clean it up and speed it up. The unit economics, of course, are everything. If the process works at scale, the cost savings from lower energy use and shorter production time could be significant. The company is led by solo founder and CEO Yang Zhong, who holds a PhD from MIT [Activate.org, Unknown].
The Thermochemical Wedge
The core of Carbion’s claim is a dramatic reduction in time and temperature. High-temperature pyrolysis is a major cost driver for synthetic graphite. By using a catalytic process at a lower temperature, Carbion aims to bypass that energy penalty entirely. The potential feedstocks are the kind of biomass that often goes underutilized: forestry residues, agricultural waste, and dedicated energy crops. This isn’t about cutting down new trees for batteries; it’s about finding a higher-value use for what’s already being produced. The company is in the pre-seed stage, having participated in the Forest Business Accelerator in 2025 [Forest Business Accelerator, 2025], but has not announced any formal funding rounds or named customers. Its early development is being supported within the Greentown Labs ecosystem [Greentown Labs, 2025].
An Early-Stage Gamble
For all the elegance of the idea, Carbion is still a slide deck and a lab process. The company has no public funding, no announced pilots with battery manufacturers, and no third-party validation of its graphite’s performance in a cell. The competitive landscape for graphite alternatives is also taking shape. Companies like CarbonScape, which makes graphite from forestry byproducts via a high-temperature process, and Anovion, which produces synthetic graphite, are further along in development and scaling. Carbion’s differentiator is its lower-temperature pathway, but that pathway is still unproven at any meaningful scale. The solo-founder structure adds another layer of operational risk for a company that will need to master chemical engineering, supply chain logistics, and sales to battery giants.
A back-of-the-envelope calculation shows the scale of the opportunity,and the challenge. The global market for battery anode material is projected to need millions of tons of graphite per year by the end of the decade. If Carbion’s process can shave even 20% off the energy cost of production, that could translate into hundreds of dollars in savings per ton. But first, it has to make a ton. The company’s most immediate competitor isn’t another startup; it’s the entrenched, energy-inefficient method of making synthetic graphite that currently supplies the industry. To win, Carbion doesn’t just need to work. It needs to work cheaper and faster, at a gigafactory scale, and convince battery makers to redesign a supply chain that is notoriously slow to change.
Sources
- [Greentown Labs, 2025] Carbion - Greentown Labs | https://greentownlabs.com/members/carbion/
- [Activate.org, Unknown] Carbion | https://activate.org/carbion
- [Forest Business Accelerator, 2025] Forest Business Accelerator | Cohort 2025 | https://forestaccelerator.com/cohort-2025/