Iljin Materials Develops Industry's First Ultra-High Strength Electrofoil

Iljin Materials' Elecfoil. It is a key material used in secondary batteries for electric vehicles.
[Photo by Iljin Materials]

[Asia Economy Reporter Kwak Min-jae] Iljin Materials, specializing in Elecfoil (copper foil), a core material for secondary batteries, announced on the 15th that it has developed the industry’s first ‘ISS-T9’ Elecfoil with a tensile strength of 90 kgf/㎟ and high elongation properties.

Elecfoil is a thin copper foil less than 10 micrometers (㎛) thick, produced by electrolyzing a copper sulfate solution, and is an essential core material used in the anode current collectors of large secondary batteries such as electric vehicles and ESS (energy storage systems).

Iljin Materials, the global No. 1 company in Elecfoil production for secondary batteries, developed the next-generation secondary battery material ‘ISS-T9’ after 13 years of research and development, which can dramatically improve the driving range, output, and stability of electric vehicles. According to the company, it is the world’s only product that maintains the high elongation of the previously released ‘I2S’ while achieving tensile strength approximately three times that of conventional Elecfoil.

Yang Jeom-sik, CEO of Iljin Materials, stated, “ISS-T9 is an essential material for battery development that can reduce process defects occurring during the manufacturing of high-capacity, high-output batteries and increase silicon content.” He added, “This product development is highly significant as it enhances national competitiveness in the secondary battery material sector and secures a leading position in the future materials market.”

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