energy-density
(3)
Enpower Greentech Inc.
Enpower Greentech is a battery maker building the next generation of lithium-metal and solid-state cells. Founded in 2012 by two post-docs from Nobel laureate John Goodenough's lab, the company designs semi-solid, quasi-solid, and all-solid-state batteries with energy densities pushing past 500 Wh/kg. Its cells power industrial drones, eVTOL aircraft, high-altitude pseudo-satellites, and electric vehicles, and it says it has shipped more than 3 million cells across its SWIFT, FLEET, and KOSMOS platforms from facilities in the US, China, Japan, and Germany.
Ionblox
Ionblox is a Fremont, California battery company building high-energy, high-power lithium-ion cells around a proprietary pre-lithiated silicon (SiOx) anode. Spun out of the earlier Zenlabs Energy effort and rebranded in 2022, the company targets two demanding markets - electric vehicles and electric aviation (eVTOL) - with cells that it says exceed 330 Wh/kg and can charge to roughly 60% in five minutes while holding up past 1,000 cycles. Backed by eVTOL maker Lilium, Applied Ventures, Temasek and Catalus Capital, Ionblox has raised about $32M in Series B funding and holds more than 40 patents.
Group14 Technologies
Group14 Technologies is a Woodinville, Washington battery materials company that makes SCC55, a silicon-carbon composite anode material that replaces graphite in lithium-ion batteries to deliver higher energy density and faster charging. Spun out of EnerG2 in 2015 by Rick Luebbe and Dr. Rick Costantino, the company operates commercial factories in Washington State and South Korea and supplies more than 100 EV, consumer electronics, and energy-storage cell makers worldwide. It has raised over $1 billion in equity, including a $463M Series D in 2025 led by SK, Inc.