Domestic LFP Battery Ecosystem Faces Test Amid ESS Policy Market Growth

South Korea's energy storage system (ESS) policy market is seeing a significant shift towards lithium iron phosphate (LFP) batteries, creating a potential catalyst for developing a domestic production ecosystem. In the second central contract market, LFP batteries captured 64.3% of the awarded volume, surpassing nickel-based batteries and reflecting a global trend.

LFP batteries are favored for grid-scale ESS due to their advantages in cost, lifespan, and thermal stability. Unlike electric vehicle batteries, the lower energy density of LFP is less of a drawback in ESS applications where weight and size constraints are less critical. This has led to LFP becoming the dominant type for grid storage globally, with Chinese companies establishing strong control over the entire supply chain, from raw materials to cells.

In response, South Korean battery makers are beginning to establish domestic LFP production capabilities. SK On plans to produce 3 GWh of LFP batteries for ESS annually starting in early 2025 at its Seosan plant, with plans for domestic sourcing of materials and assembly. LG Energy Solution will begin initial production in Ochang in 2027, and Samsung SDI aims to build its production system in Ulsan.

However, the success of these initiatives hinges on sustained investment and the development of a robust domestic supply chain. The industry's historical focus on high-nickel ternary batteries for EVs means that if the current ESS demand does not translate into consistent production and material sourcing, further expansion could be delayed. Without this foundation, closing the price gap with Chinese competitors remains a significant challenge. Government support, including tax incentives for domestic production, is also seen as critical, with industry players advocating for direct refund mechanisms similar to those in the U.S. to support companies during initial loss-making periods.