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KAIST develops new solid electrolyte and produces high-performance solid-state battery

by Global Economic Reporter Yong-jun Yeo ; Translate by Gounee Yang

기사입력 : 2022-01-14 10:43

Photo=KAIST
Photo=KAIST
A research team, led by Professor Kim Bum-joon of Department of Chemical and Biomolecular Engineering at KAIST, and the U.S. research team have jointly developed new rubber-type high molecule electrolyte and produced world’s best performance solid-state battery.

It is expected that the mileage of electric vehicles (EVs), which is currently 500km range, will be increased up to 800km on a single charge.

According to KAIST on the 13th, all-solid-state Li-metal battery is considered the most innovative technology that can improve EV mileage and safety by significantly increasing energy density compared to existing lithium ion batteries.

The research team developed an elastomeric solid electrolyte by three-dimensionally connecting crystalline plastics, which have very high lithium-ion conductivity, in the elastomer with excellent elasticity like rubber.

The electrolyte developed by the research team has an ion conductivity of 10-3 S/cm, which is 100 times better than traditional PEO-based polymer electrolytes.

The electrolyte has excellent elasticity like rubber, so it can prevent the growth of lithium dendrite, which is the main factor causing safety problem during battery charging and discharging, securing performance and safety.

The newly developed electrolyte stably worked on the solid-state battery composed of a thin lithium metal anode and nickel-rich layered cathode (NCM-Ni83), even at a high voltage of 4.5V or higher.

It also showed the world’s best level energy density of more than 410 Wh/kg.

With this technologies, EVs are expected to be able to drive 800km on a single charge (currently, the mileage is around 500km).

Professor Kim of KAIST said, “The is very meaningful not only to have developed high-performance all-solid-state battery, but also to have secured core material technology by developing a completely new type of solid electrolyte.”


by Global Economic Reporter Yong-jun Yeo ; Translate by Gounee Yang