Fariñas Lola, Muñoz Manuel, Gómez Álvarez-Arenas Tomás E
Ultrasonic and Sensors Technologies Department (ITEFI), Spanish National Research Council (CSIC), 28006 Madrid, Spain.
iScience. 2024 Sep 26;27(10):111046. doi: 10.1016/j.isci.2024.111046. eCollection 2024 Oct 18.
Lithium-ion batteries (LIBs) are playing nowadays a key role in the decarbonization of the economy. However, safety issues and the lack of an accurate performance predictor after manufacturing led to the application of non-destructive methods in this field that can assess their condition. Contact ultrasounds have been successfully applied in recent years in this regard, mainly in research facilities, proving the potential of ultrasonic waves to collect meaningful information. However, some restrictions on their applicability have been identified, compromising their repeatability and stability in operando and in fabrication. Here, we present a contactless ultrasound spectroscopy technique based on the use of air-coupled transducers of high sensitivity and wide frequency band to detect state-of-charge (SOC)-related changes in LIB cells in operando. Additionally, its ability to detect mechanical integrity alterations was also revealed, showing the potential of contactless ultrasound spectroscopy as a powerful tool to test and predict early failures in LIBs.
如今，锂离子电池（LIBs）在经济脱碳过程中发挥着关键作用。然而，安全问题以及制造后缺乏准确的性能预测指标，促使无损检测方法在该领域的应用，这些方法能够评估电池的状态。近年来，接触式超声已成功应用于这方面，主要是在研究机构，证明了超声波收集有意义信息的潜力。然而，已发现其适用性存在一些限制，影响了其在操作中和制造过程中的可重复性和稳定性。在此，我们提出一种基于使用高灵敏度和宽频带空气耦合换能器的非接触式超声光谱技术，用于在操作中检测LIB电池中与充电状态（SOC）相关的变化。此外，还揭示了其检测机械完整性改变的能力，显示出非接触式超声光谱作为测试和预测LIB早期故障的强大工具的潜力。
