6K Inc. manufactures battery cathode materials and metal powders using a proprietary microwave plasma process.
6K Inc. is a materials manufacturer that uses a proprietary microwave plasma production process called UniMelt to produce advanced powders. The company operates two divisions: 6K Energy, which produces lithium-ion battery cathode active materials such as nickel-manganese-cobalt (NMC) and lithium iron phosphate (LFP), and 6K Additive, which produces metal powders for additive manufacturing and 3D printing.
6K Energy's cathode materials are produced at a facility in North Andover, Massachusetts. In November 2026, the company received a conditional commitment for a $250 million loan from the U.S. Department of War's Office of Strategic Capital to build a new domestic cathode active material production facility in Jackson, Tennessee, aimed at reducing U.S. reliance on foreign battery material supply chains.
The company has raised capital across several venture rounds since being founded in 2014, including a $102 million Series D round led by Koch Strategic Platforms in 2022 and an $82 million Series E round in 2024 with participation from existing investors including Anzu Partners, Energy Impact Partners, LaunchCapital, Material Impact, and Volta Energy Technologies.