The company's shares ended up 8.8% in Tokyo.

Subsidiary W-Scope Chungju Plant will supply about 4 billion square metres of separators to Samsung SDI in South Korea, the United States, and other areas, the company said in a statement.

The deal, which runs from 2023 to 2027, has already been factored into the company's earnings for this year, W-Scope added.

(Reporting by Chang-Ran Kim; editing by Eileen Soreng)