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Teijin to establish third production line for LIELSORT separators for Li-ion batteries; advanced version for automotive

Teijin Limited will establish a third production line for LIELSORT, its separator for lithium-ion secondary batteries (LIBs) at a manufacturing company in South Korea. Teijin will begin operating the line this summer to meet an increasing market demand for coated separators.

LIELSORT is used in smartphones and tablets worldwide. By adding the third production line and improving processes on existing lines, Teijin will increase its current LIELSORT production capacity by 70%. The new line will also help to accelerate Teijin’s development of an advanced version of LIELSORT that is expected to offer higher heat resistance and adhesion for automotive uses.

Teijin leveraged its expertise in polymeric chemistry to develop the world’s first process for simultaneously coating both sides of separators. It also developed a high-speed coating process that is five times faster than conventional coating. Both technologies enable more efficient production.

MIRAIM, a high-performance microporous membrane that Teijin introduced in 2015, combines advanced coating and multi-stratification technologies in a high-precision thin-film uniform-pore-diameter membrane that is made of polyethylene. Teijin expects combined sales of LIELSORT separators and MIRAIM membranes to reach ¥20 billion (approximately US$180 million) by 2020.

Teijin produces two types of LIELSORT separators. One is a polyethylene-based material coated with Teijinconex, a highly heat-resistant meta-aramid, and the other is coated with a highly electrode-adhesive, oxidation-resistant fluorine-based compound. Teijin Lielsort Korea Co., Ltd., a wholly owned subsidiary of Teijin, produces both LIELSORT separators.


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