DuPont Announces New Kevlar® MicroCore™ – Making Electric Vehicle Batteries Safer

DuPont Announces New Kevlar® MicroCore™ – Making Electric Vehicle Batteries Safer
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Innovative super fine fiber material helps enable improved battery safety and performance in next-generation high-heat-resistant lithium ion batteries separator

WILMINGTON, Del., May 17, 2021 — DuPont today announced the introduction of a new groundbreaking development—DuPont™ Kevlar® MicroCore™, a unique, high-temperature-resistant, super fine fiber material planned for use in battery separators to help address the growing demand for safer, higher-performing lithium ion batteries for electric vehicles (EVs).

Unlike other materials currently used in battery separators, Kevlar® MicroCore™ is inherently non-flammable and won’t shrink—even at temperatures up to 300°C. Throughout rigorous testing, Kevlar® MicroCore™ has demonstrated better lithium ion transfer abilities in the battery separator, ultimately leading to potentially faster charging and higher power for EVs.

“New Kevlar® MicroCore™ is the latest example of DuPont’s core role in electrification and providing innovative solutions that will help advance sustainable mobility,” said Carlo Fiorella, global market manager, DuPont Automotive. “When used in battery separators, Kevlar® MicroCore™ can help prevent the biggest safety issue for EV batteries—thermal runaway. Testing has shown that it may also enable EV batteries to charge faster and deliver higher acceleration power, addressing two key performance concerns for both consumers and EV manufacturers.”   

DuPont is working in collaboration with NIPPON KODOSHI CORPORATION (NKK), a Japan-based forward-thinking manufacturer of separators for energy devices including lithium ion batteries, to bring the benefits of this innovative material to the market with NKK’s TopNove™ made with DuPont™ Kevlar® MicroCore™. NKK’s capability and expertise in producing thin and uniform paper made them an ideal collaboration partner for this specific project.

Independent researchers at Yamagata University in Japan have tested the safety and performance of NKK’s TopNove™ made with DuPont™ Kevlar® MicroCore™ and preliminary results have shown that in certain conditions it performs better than incumbent separators, such as ceramic coated microporous film.

“With its unique combination of properties, we believe Kevlar® MicroCore™ is a real game changer that will take EV batteries to the next level of safety and performance,” said Fiorella. “What’s more, similar improvements can be achieved for advanced technology battery systems in use across other industries, such as aerospace, defense, medical, industrial, transportation, utilities or other critical commercial applications.”

To learn more about automotive solutions from DuPont, please visit For information about NIPPON KODOSHI CORPORATION (NKK) or TopNove™, please visit



About DuPont Water & Protection

DuPont Water and Protection is a global leader in creating water, shelter and safety solutions for a more sustainable world; enabling its customers to win through unique capabilities, global scale and iconic brands including Kevlar®, Nomex®, Tyvek®, Corian® Design, GreatStuff™, Styrofoam™, and FilmTec™.


About DuPont

DuPont (NYSE: DD) is a global innovation leader with technology-based materials and solutions that help transform industries and everyday life. Our employees apply diverse science and expertise to help customers advance their best ideas and deliver essential innovations in key markets including electronics, transportation, construction, water, healthcare and worker safety. More information about the company, its businesses and solutions can be found at Investors can access information included on the Investor Relations section of the website at

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DuPont™, the DuPont Oval Logo, and all trademarks and service marks denoted with ™, ℠ or ® are owned by affiliates of DuPont de Nemours, Inc. unless otherwise noted. TopNove™ is a trademark of NIPPON KODOSHI CORPORATION (NKK).


For further information contact:

Jennifer McMahon

Marketing Communications Lead, DuPont Automotive