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

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.

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Publication Details

Journal
Nature Communications
Published
2024-09-27
DOI
https://doi.org/10.1038/s41467-024-52766-9
Citations
44
Primary Topic
Advancements in Battery Materials
Type
article
Field-Weighted Citation Impact
9.18

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

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

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article en
44 citations

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.

Nature CommunicationsVol. 15(1)
Seoul National University of Science and Technology (KR), Pohang University of Science and Technology (KR), LG (United States) (US), Korea Institute of Energy Research (KR)
National Research Foundation, Ministry of Trade, Industry and Energy, Korea Institute for Advancement of Technology, National Research Foundation of Korea, Ministry of Science and ICT, South Korea
Openalex Percentile: Top 1%
Advancements in Battery Materials
9.18
DOIOpen Access PDFOpenAlex
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