JEIO Co., Ltd. operates in secondary battery materials, plant engineering, and equipment manufacturing and distribution in South Korea and internationally. It offers battery materials including carbon nanotubes under the JENOTUBE name, which are tube shapes composed of carbon atoms in a hexagonal shape. The company also provides design, engineering, procurement, construction, and commissioning services for projects in areas such as secondary battery materials, semiconductors, electronic materials, eco-environment and energy, and fine chemicals and petrochemicals. Founded in 1994, it is headquartered in Incheon, South Korea.