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Novel Triaxial Raman Scanning Platform for Evaluating Integrity of Graphite Electrodes in Li-Ion Batteries
oleh: Pei-Han Guo, Hsin-Ming Cheng, Jeng-Shiung Chen, Yi-Shiuan Wu, Chun-Chen Yang, Fu-Yen Zeng, Ren-Jie Chung, Po-Tuan Chen
Format: | Article |
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Diterbitkan: | IEEE 2021-01-01 |
Deskripsi
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.