Effect of organic solvent additives on the enhancement of ultrasonic cavitation effects in water for lithium-ion battery electrode delamination

IF 8.7 1区化学 Q1 ACOUSTICS Ultrasonics Sonochemistry Pub Date : 2024-08-31 DOI:10.1016/j.ultsonch.2024.107049

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Abstract

Ultrasonic delamination is a low energy approach for direct recycling of spent lithium-ion batteries. The efficiency of the ultrasonic delamination relies both on the thermophysical properties (such as viscosity, surface tension, and vapour pressure) of the solvent in which the delamination process is carried out, and the properties of the ultrasound source as well as the geometry of the containment vessel. However, the effect of tailoring solutions to optimise cavitation and delamination of battery cathode coatings has not yet been sufficiently investigated. Acoustic detection, high-speed imaging, and sonochemiluminescence (SCL) are employed to study the cavitation processes in water-glycol systems and identify the effect of tailoring solvent composition on cavitation strength. The addition of small volume fractions of organic solvent (ca. 10–30 vol%), including ethylene glycol or glycerol, to the aqueous delamination solution were found to significantly improve the delamination efficiency of lithium-ion battery cathode coatings due to the alteration of these thermophysical properties. However, greater volume fractions of glycol decrease delamination efficiency due to the signal-dampening effect of viscosity on the ultrasonic waves. The findings of this study offer valuable insights for optimising ultrasonic bath solution composition to enhance film delamination processes.

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有机溶剂添加剂对增强锂离子电池电极脱层的水中超声空化效应的影响

超声波分层是一种直接回收锂离子废电池的低能耗方法。超声波分层的效率既取决于进行分层的溶剂的热物理性质（如粘度、表面张力和蒸汽压力），也取决于超声波源的特性以及安全壳的几何形状。然而，人们尚未充分研究定制解决方案对优化电池阴极涂层空化和分层的影响。我们采用声学检测、高速成像和声化学发光（SCL）技术来研究水-乙二醇体系中的空化过程，并确定定制溶剂成分对空化强度的影响。研究发现，在脱层水溶液中加入小体积分数的有机溶剂（约 10-30 Vol%），包括乙二醇或甘油，可显著提高锂离子电池正极涂层的脱层效率，原因是这些热物理性质发生了改变。然而，乙二醇的体积分数越大，分层效率就越低，这是由于粘度对超声波的信号阻尼作用。这项研究的结果为优化超声波槽溶液成分以增强薄膜脱层过程提供了宝贵的见解。

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来源期刊

Ultrasonics Sonochemistry 化学-化学综合

CiteScore

15.80

自引率

11.90%

发文量

361

审稿时长

59 days

期刊介绍： Ultrasonics Sonochemistry stands as a premier international journal dedicated to the publication of high-quality research articles primarily focusing on chemical reactions and reactors induced by ultrasonic waves, known as sonochemistry. Beyond chemical reactions, the journal also welcomes contributions related to cavitation-induced events and processing, including sonoluminescence, and the transformation of materials on chemical, physical, and biological levels. Since its inception in 1994, Ultrasonics Sonochemistry has consistently maintained a top ranking in the "Acoustics" category, reflecting its esteemed reputation in the field. The journal publishes exceptional papers covering various areas of ultrasonics and sonochemistry. Its contributions are highly regarded by both academia and industry stakeholders, demonstrating its relevance and impact in advancing research and innovation.