Stretchable Carbon Nanotube Dilatometer for In Situ Swelling Detection of Lithium-Ion Batteries,ACS Applied Energy Materials

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Stretchable Carbon Nanotube Dilatometer for In Situ Swelling Detection of Lithium-Ion Batteries
ACS Applied Energy Materials ( IF 5.4 ) Pub Date : 2020-03-19 00:00:00 , DOI: 10.1021/acsaem.0c00114
Leilei Wang ₁ , Woohyuk Choi ₁ , Kisoo Yoo ₁ , Kanghyun Nam ₁ , Tae Jo Ko ₁ , Jungwook Choi ₁

Affiliation

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.

中文翻译：

可伸缩碳纳米管膨胀计用于锂离子电池的原位膨胀检测

锂离子电池（LIB）的进步已实现了具有高能量密度，比容量和循环稳定性的轻型电源。由于LIB在操作过程中固有地承受热机械应力，因此它们的体积变化可以指示其电化学反应和安全状态。在这项研究中，基于碳纳米管（CNT）的可拉伸且可保形安装在LIB表面的膨胀计已被开发用于LIB膨胀的敏感和原位测量。碳纳米管在薄弹性体的顶部形成渗滤网络，并表现出约50的正应变系数和-0.075％K ^–1的负电阻温度系数。，可以定量提取肿胀程度。结果，成功地实时检测到LIB的规则反应（锂离子/去锂化循环约50μm溶胀）和不规则反应（由于温度升高导致气体异常析出几毫米溶胀）。与传统的膨胀计复杂，昂贵和笨重不同，CNT传感器由于其简单性，便携性和灵敏性，可用于了解电化学反应并防止便携式LIB发生严重故障，而无需将其与其他LIB组件拆开。设备。

更新日期：2020-03-19

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