South Korean cathode-material producers are accelerating investment in lithium iron phosphate (LFP) as demand from energy storage systems (ESS) and efforts to build non-Chinese supply chains increase competition for capacity. Industry estimates put LFP cathode supply commitments between domestic battery-cell makers and materials suppliers above 210,000 metric tons. POSCO Future M plans to convert part of its existing high-nickel lines in Pohang, raising annual LFP capacity from about 20,000 tons to as much as 105,000 tons by the end of next year, while also using up to 50,000 tons of capacity from its joint venture CNP New Material Technology. The company has signed LFP supply deals worth 1.07 trillion won with SK On and about 6 trillion won with Samsung SDI. L&F has secured agreements with Samsung SDI, SK On and LG Energy Solution totaling 250,000 tons, equivalent to approximately 100 gigawatt-hours of ESS capacity, and plans to add 60,000 tons of annual capacity by the second half of 2028, bringing its total to 120,000 tons. Its proposed expansion has previously included a second 60,000-ton plant at the Daegu National Industrial Complex. EcoPro BM is discussing an agreement covering about 4,000 tons annually and considering a dedicated line of up to 50,000 tons. LFP generally costs less and offers longer cycle life than nickel-based chemistries, making it increasingly attractive for stationary storage linked to North American artificial-intelligence data centers and power grids. The expansion also offers domestic producers an opportunity to narrow their historical disadvantage against Chinese suppliers as electric-vehicle demand slows and profitability remains under pressure.