Stretchable Carbon Nanotube Dilatometer for In Situ Swelling Detection of Lithium-Ion BatteriesClick to copy article linkArticle link copied!
- Leilei WangLeilei WangSchool of Mechanical Engineering, Yeungnam University, 280Daehak-ro, Gyeongsan, Gyeongbuk 38541, Republic of KoreaMore by Leilei Wang
- Woohyuk ChoiWoohyuk ChoiSchool of Mechanical Engineering, Yeungnam University, 280Daehak-ro, Gyeongsan, Gyeongbuk 38541, Republic of KoreaMore by Woohyuk Choi
- Kisoo YooKisoo YooSchool of Mechanical Engineering, Yeungnam University, 280Daehak-ro, Gyeongsan, Gyeongbuk 38541, Republic of KoreaMore by Kisoo Yoo
- Kanghyun NamKanghyun NamSchool of Mechanical Engineering, Yeungnam University, 280Daehak-ro, Gyeongsan, Gyeongbuk 38541, Republic of KoreaMore by Kanghyun Nam
- Tae Jo Ko*Tae Jo Ko*Email: [email protected]School of Mechanical Engineering, Yeungnam University, 280Daehak-ro, Gyeongsan, Gyeongbuk 38541, Republic of KoreaMore by Tae Jo Ko
- Jungwook Choi*Jungwook Choi*Email: [email protected]School of Mechanical Engineering, Yeungnam University, 280Daehak-ro, Gyeongsan, Gyeongbuk 38541, Republic of KoreaMore by Jungwook Choi
Abstract
Advances in lithium-ion batteries (LIBs) have enabled the realization of lightweight power sources with high energy density, specific capacity, and cyclic stability. As LIBs are inherently subjected to thermomechanical stress during operation, their volume change can be indicative of their electrochemical reactions and safety status. In this study, a carbon nanotube (CNT)-based dilatometer that is stretchable and can be conformally mounted on the surface of LIBs has been developed for sensitive and in situ measurements of the LIB swelling. The CNTs form a percolation network on top of a thin elastomer and exhibit a positive gauge factor of ∼50 and a negative temperature coefficient of resistance of −0.075% K–1, enabling a quantitative extraction of the extent of swelling. As a result, both regular (∼50 μm swelling by lithiation/delithiation cycles) and irregular (a few millimeter swelling by abnormal gas evolution because of increased temperature) reactions of LIBs are successfully detected in real time. Unlike the conventional dilatometers that are complex, expensive, and bulky, the CNT sensor, because of its simplicity, portability, and sensitivity, is useful for understanding electrochemical reactions and preventing serious failures of portable LIBs, without disassembling them from the other components of the device.
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