SK Innovation Co. Ltd.'s (SKI) credit metrics will recover substantially over 2021-2022 due to a rebound in earnings and a sizable asset sale by the Korea-based oil refining company. However, aggressive investments for expanding SKI's electric vehicle (EV) battery production are likely to keep its debt high. This will leave a narrow ratings buffer given high volatility in the refining and chemical industry, as well as uncertainty over rapidly ramping up the company's production capacity for EV batteries. On Oct. 7, 2021, S&P Global Ratings affirmed its 'BBB-' issuer credit rating on SKI. At the same time, we affirmed the issue credit rating on the company's outstanding debt at 'BB+'. We also affirmed our issuer credit rating on SKI's subsidiary