South Korea's three battery giants — LG Energy Solution, Samsung SDI and SK On — have long dominated the global lithium-ion battery market outside China. But in 2026 they face a defining challenge: Chinese rivals led by CATL and BYD have surged ahead, and Korean makers are fighting back with new chemistries, overseas gigafactories and deeper auto partnerships. Here is the state of the Korean EV battery supply chain and what it means for the global electric vehicle industry.

The Battle for Global Market Share

The competitive landscape has shifted sharply. According to SNE Research, the combined global market share of the Korean "Big Three" fell to about 18.4 percent in 2024, down from 23.1 percent in 2023. By the third quarter of 2025, LG Energy Solution ranked second globally with roughly 14.1 percent of installations, Samsung SDI fourth with 5.7 percent, and SK On fifth with 3.6 percent.

Meanwhile, Chinese battery makers have consolidated their dominance. Industry estimates suggest CATL and BYD together control about 52 percent of global installations. CATL alone installed a record 339.3 gigawatt-hours in 2024, up 31.7 percent year-on-year. The Chinese advantage rests on scale, aggressive pricing, vertically integrated supply chains and dominance of the low-cost LFP (lithium iron phosphate) chemistry that now powers the mass market.

Pressure on Korean Exports and Utilization

The shift has had real consequences at home. South Korea's secondary battery exports fell 1.6 percent to US$9.8 billion in 2023, the first decline since 2015, and dropped a further 26.2 percent in January 2024 alone amid weaker demand and falling prices. Domestic plant utilisation rates for the three Korean makers fell below 50 percent in 2024, down sharply from above 70 percent in 2021 and 2022.

Low utilisation directly pressures profitability, since battery plants carry high fixed costs. Falling battery prices — driven by Chinese oversupply and cheaper LFP chemistries — compound the margin squeeze. Korean makers responded by rationalising capacity, deferring some expansions and focusing on higher-value products where they still hold an edge.

Korea's Counter-Strategy

Far from retreating, Korean battery makers are deploying a multi-pronged counter-strategy:

Why the Supply Chain Matters Globally

The Korean battery supply chain is strategically critical far beyond Korean borders. Korea has built a complete domestic battery value chain, from cathode and anode materials to cells and complete packs, anchored by the three majors and their supplier ecosystems. Combined with South Korea's EV export strength — Hyundai and Kia are among the world's top EV sellers — battery manufacturing is a cornerstone of the national economy.

Policymakers in Washington, Brussels and elsewhere see Korean battery investment as a hedge against Chinese dominance and are courting Korean firms with incentives. This explains why so much of Korea's gigafactory investment has flowed to North America and Europe, and why the United States Inflation Reduction Act treats South Korea as a preferred trade partner for battery sourcing.

The next few years will determine whether Korea can defend a meaningful global role in batteries or cede ground to China. Success will hinge on cost reduction, chemistry innovation and the speed at which Korean makers can convert their overseas capacity into profitable output. For the global EV industry, a competitive Korean battery sector remains essential — it keeps prices in check, diversifies supply and accelerates the transition away from fossil fuels.

Key Takeaways