Pentagon Offers Battery Startup 6K a $250 Million Loan

The Pentagon has granted conditional approval for a $250 million loan to 6K, a 12-year-old battery startup based in North Andover, Massachusetts, to build a factory in Tennessee. The company announced the deal Thursday.

That's real money from an unusual source. The Department of Defense doesn't hand out half-billion-dollar-style commitments to startups every week, and the reason is straightforward: batteries are everywhere, including on the battlefield. Washington wants more domestic manufacturing capacity, and 6K's technology is pitched as a way to produce battery materials without relying on Chinese suppliers.

For practitioners in the battery supply chain, the interesting part isn't just the loan size. It's what the money funds.

What makes 6K's process different?

6K's manufacturing method uses microwaves to heat metals into a plasma, then deposits that plasma onto a surface. According to the company, this cuts the number of steps required to make cathode material — a key battery component — and the process works across several battery types, including lithium iron phosphate, or LFP.

Fewer processing steps typically means lower cost and a smaller factory footprint. If the company's claims hold at commercial scale, that matters for anyone sourcing cathode material in the U.S.

What does this change for 6K?

The Tennessee plant now has a federal backer with deep pockets and a strategic motive. But the road here wasn't smooth.

The factory was originally slated to open in 2024. That timeline collapsed. The company had won a $50 million grant from the Department of Energy under the Bipartisan Infrastructure Law in 2023, but the Trump administration canceled that grant in a chaotic sweep of Biden-era awards, forcing 6K to reapply.

The grant cancellation plus uncertainty in the EV market forced the company to rejigger its plans. The new DoD loan — five times the size of the canceled DOE grant — replaces that lost federal support and then some.

Why the Pentagon is writing battery checks

The defense angle is the story's engine. Modern military operations run on batteries — radios, drones, sensors, portable electronics — and a supply chain that runs through China is a vulnerability the Pentagon has moved to reduce.

A domestic plant producing cathode material with a China-free process checks that box directly. For 6K, that shifts its customer logic from purely EV-driven demand toward defense procurement, a buyer less exposed to consumer EV market swings — the very swings that derailed the original 2024 timeline.

What to watch next

The approval is conditional, so the loan isn't cash in hand yet. 6K will need to meet the Pentagon's conditions, complete the Tennessee buildout and prove its microwave plasma process works at industrial volume.

The company has a $50 million wound from the DOE episode, a delayed factory and a new $250 million lifeline. If it executes, 6K becomes a test case for whether defense dollars can succeed where infrastructure dollars got pulled back — and whether microwave plasma can compete in a cathode market China currently dominates.