Novel Triaxial Raman Scanning Platform for Evaluating Integrity of Graphite Electrodes in Li-Ion Batteries

• Published in: IEEE access Vol. 9; pp. 81895 - 81901
• Main Authors: Guo, Pei-Han, Cheng, Hsin-Ming, Chen, Jeng-Shiung, Wu, Yi-Shiuan, Yang, Chun-Chen, Zeng, Fu-Yen, Chung, Ren-Jie, Chen, Po-Tuan
• Format: Journal Article
• Language: English
• Published: Piscataway IEEE 2021; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Battery charge measurement; Charging; Crystal defects; Electrodes; Graphite; Graphite electrode; Integrity; Li-ion batteries; Lithium-ion batteries; Mapping; Raman scattering; Raman spectroscopy; Rechargeable batteries; Scanning; Stacking; two-dimensional mapping; Voltage measurement
• ISSN: 2169-3536; 2169-3536
• DOI: 10.1109/ACCESS.2021.3085884

The quality of Li-ion batteries is highly related to the crystallinity of the graphite used in their electrodes. Therefore, the development of two-dimensional detection equipment for evaluating the integrity of graphite electrodes is critical. In this study, a triaxial scanning platform was developed for Raman spectroscopy. Two-dimensional Raman mapping of the defects (D band) and stacking (2D band) of graphite electrodes was performed to determine atomic-level variations caused by charging. Through Raman mapping, the effects of constant-current-constant-voltage (CC-CV) and CC-reFLEX fast charging were compared. The graphite damage from CC-reFLEX fast charging was less extensive than that from CC-CV charging. Furthermore, investigations using the triaxial platform revealed that the graphite on a curved electrode exhibited disordered stacking after several charging-discharging cycles. This phenomenon creates safety concerns.