The sources said the deal was worth more than 10 trillion won ($8.6 billion).

SK Innovation, Hyundai Motor and Kia declined to comment.

Hyundai Motor said in October it would launch 16 EV models by 2025, aiming to boost EV sales 560,000 by then, a level that would be equivalent to more than 10% of its projected global sales this year.

(Reporting by Hyunjoo Jin; Editing by Edmund Blair)