Asahi Kasei has successfully achieved proof of concept (POC) of lithium-ion batteries (LIBs) using its proprietary high ionic conductive electrolyte¹. This technological breakthrough allows for increased power output even at low temperatures. Moreover, it allows improved durability even at high temperatures.

Both low and high temperatures are pressing issues of current LIBs. Furthermore, this technology can contribute to lower cost and smaller size of battery packs, further raising the energy density.

Typically, the recommended temperature range for LiB usage is between 10 to 45°C. However, lower temperatures result in lower cell capacity, lower power output, and longer charging times. On the other hand, higher temperatures result in accelerated aging which reduces battery service life.

With the rapidly emerging market of energy storage systems worldwide, especially in the field of electric vehicles, stable battery performance and high durability at extreme temperatures is of significant importance.

Enabling battery size and cost reduction

Asahi Kasei is a pioneer in lithium-ion battery research and battery material manufacturing. Asahi Kasei began developing an electrolyte with high ionic conductivity in 2010. Specifically, when Honorary Fellow Akira Yoshino² focused on acetonitrile as a promising ingredient in lithium-ion battery electrolytes.

By using the high ionic conductive electrolyte, it has been possible to reduce battery pack size while maintaining the power output. Thus, contributing to higher battery energy density and lower overall pack cost.

Commercialization planned for 2025

Compared to cells made with conventional electrolytes, the tested prototype cylindrical cells showed high power at -40°C. it also doubled the cycle life at 60°C before reaching a state of health (SOH) of 80%. Commercialization will happen in 2025.

Kazuya Noda, Senior General Manager of Asahi Kasei’s Innovation Strategy Center, commented, “This proof of concept is a technological breakthrough. By licensing the electrolyte technology to LIB manufactures worldwide, Asahi Kasei aims to contribute to lower cost and more compact battery systems. These are key drivers to achieve a more sustainable society.”

Notes:

¹Moderately Concentrated Acetonitrile-containing Electrolytes with High Ionic Conductivity for Durability-oriented Lithium-Ion Batteries: https://chemistry-europe.onlinelibrary.wiley.com/doi/full/10.1002/celc.202100927

²Special site featuring Dr. Akira Yoshino: https://www.asahi-kasei.com/asahikasei-brands/yoshino/