Nippon Denkai, as its name suggests, is a company engaged in the production of electrolytic copper foil. This process involves the electrolysis of an electrolyte, primarily composed of copper sulfate, to deposit and process metallic copper into thin films. The company develops, manufactures, and sells electrolytic copper foil for a variety of applications, including automotive batteries, circuit boards for 5G, printed circuit boards, and semiconductor packages. Particularly in the automotive battery sector, Nippon Denkai boasts a high market share in both Japan and the United States.

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