Thermal runaway prevention through scalable fabrication of safety reinforced layer in practical Li-ion batteries

In Taek Song, Joonkoo Kang, Jongkwan Koh, Hyunju Choi, Heemyeong Yang, Eunkyung Park, Jina Lee, Woohyung Cho, Yu-mi Lee, Seokkyeong Lee, Noma Kim, Minah Lee () and Kihwan Kim ()
Additional contact information
In Taek Song: Platform Technology Research Center
Joonkoo Kang: Platform Technology Research Center
Jongkwan Koh: Platform Technology Research Center
Hyunju Choi: Platform Technology Research Center
Heemyeong Yang: Platform Technology Research Center
Eunkyung Park: Platform Technology Research Center
Jina Lee: Pohang University of Science and Technology (POSTECH)
Woohyung Cho: LG Energy Solution
Yu-mi Lee: LG Energy Solution
Seokkyeong Lee: LG Energy Solution
Noma Kim: Platform Technology Research Center
Minah Lee: Pohang University of Science and Technology (POSTECH)
Kihwan Kim: Platform Technology Research Center

Nature Communications, 2024, vol. 15, issue 1, 1-11

Abstract: Abstract Integrating safety features to cut off excessive current during accidental internal short circuits in Li-ion batteries (LIBs) can reduce the risk of thermal runaway. However, making this concept practical requires overcoming challenges in both material development and scalable manufacturing. Here, we demonstrate the roll-to-roll production of a safety reinforced layer (SRL) on current collectors at a rate of 5 km per day. The SRL, made of molecularly engineered polythiophene (PTh) and carbon additives, interrupts current flow during voltage drops or overheating without adversely affecting battery performance. Impact testing on 3.4-Ah pouch cells shows that the SRL reduces battery explosions from 63% to 10%. This work underscores the potential of integrating material science with manufacturing technology to enhance battery safety.

Date: 2024
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DOI: 10.1038/s41467-024-52766-9

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