█ First TECH DAY since the company’s establishment… Providing customized technologies by product applications such as high-value AI circuit foil and ESS copper foil.

█ Responding to growing demand for high-value AI circuit foil through the Iksan plant, Korea’s only circuit-foil production base… Unveiling five ultra-low-profile AI-network copper foil product lineups enabling maximized power efficiency and ultra-low-latency transimission.

█ Showcasing differentiated technologies of the high-end battery copper foil ‘HiSTEP’… A product that simultaneously delivers high strength and high elongation, enabling early mass production and product specialization aligned with customers’ product roadmaps.

█ Securing next-generation battery materials such as LFP cathode materials, sulfide-based solid electrolytes, and next-generation anode current collectors for all-solid-state batteries to strengthen future core competitiveness.

LOTTE Energy Materials (CEO Kim Yeon-seop) held an event to share the technological capabilities of its core businesses including high-value AI circuit foil and battery copper foil, and the development direction of next-generation battery materials.

On the afternoon of the 19th, the company hosted its first ‘TECH DAY 2025’ event at Signiel Seoul in Jamsil for analysts, unveiling high-value AI circuit foils, the high-end copper foil product ‘HiSTEP,’ and next-generation battery materials such as LFP cathode materials and sulfide-based solid electrolyte products. This was followed by a one-hour presentation by Ryu Jong-ho, Head of R&D (CTO), who explained the differentiated technologies and commercialization of AI-grade high-value circuit foils and copper foils for battery.

In particular, the rapid surge in demand for AI-grade high-value circuit foils driven by increased AI infrastructure investments by big tech companies, LOTTE Energy Materials presented its technological strengths and strategies anchored in the Iksan plant—Korea’s only circuit-foil production base.

Including the 4th- and 5th-generation ultra-low-profile circuit foils for AI networks currently under development, the company unveiled a lineup of five ultra-low-profile circuit foil products for AI networks that enable maximized power efficiency and ultra-low-latency transmission, reinforcing its leadership in the high-value AI circuit foil market. In addition, it disclosed ultra-thin and ultra-low-roughness technologies for semiconductor package circuit foils, which are suitable for high-speed signal transmission and minimizing signal loss. 

It was also explained that the high-strength and high-elongation characteristics of the high-end battery copper foil product ‘HiSTEP,’ which reduces defect rates by being less sensitive to temperature fluctuations, enable the thinning of ESS-grade battery copper foil, and that the application of high-loading silicon anode active materials of more than 10% can further improve stability.  

Ryu Jong-ho, Head of R&D (CTO), said, “By securing high-end copper foil platform technology and next-generation battery materials, we will continue to stabilize for the growth of the domestic battery, AI, and semiconductor industries, and collaborate in creating customer value through technology acquisition and enhanced product competitiveness.”  

LOTTE Energy Materials is also strengthening its future core competitiveness with next-generation battery materials such as LFP cathode materials, sulfide-based solid electrolytes, and next-generation anode current collectors for all-solid-state batteries.    

The LFP cathode material plant, which completed a 1,000-ton annual pilot facility in December last year, has achieved early stabilization of the LFP (lithium·iron·phosphate) process based on operational experience from the LMO (lithium manganese oxide cathode active material) process, and announced that it is advancing products with customers using its particle size control technology.  

The sulfide-based solid electrolyte pilot plant, equipped with dry and wet synthesis technologies and particle size control capabilities, was built in the second half of last year at the Iksan plant in Jeonbuk and is conducting tests based on industry-leading energy density, stability, and mass-production technology.   

LOTTE Energy Materials is also developing a next-generation anode current collector for all-solid-state batteries by nickel-plating conventional copper foil to enhance heat resistance and corrosion resistance. The nickel-plating thickness can be optimized from the battery design stage to ensure stable uniformity.  

Additionally, LOTTE Energy Materials expanded its research and office buildings by approximately 2,385 m² (about 721 py) last month to strengthen R&D capabilities, secure competitiveness in next-generation battery materials, and enable efficient commercialization.