Well, just barely. They claim to have made some samples.[1] Read their SEC filing for Q1 2022.

They already went public via an SPAC reverse merger, with a nominal value around $1 billion.

The biggest concern is in the "Risks" section: "Our roadmap to improve our energy density requires us to implement higher energy density materials for both cathodes and anodes." That's a fundamental problem, and the story of too many wannabe battery makers. It would be much better if the SEC filing said they had a working prototype which met the announced specs, and the big risk was scaling up the manufacturing of the prototype.

The stock symbol is ENVX.

[1] https://www.sec.gov/ix?doc=/Archives/edgar/data/1828318/0000...