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

IEEE Access

Yi-Shiuan Wu¹  Chun-Chen Yang¹  Pei-Han Guo²  Ren-Jie Chung²  Fu-Yen Zeng²  Hsin-Ming Cheng³  Po-Tuan Chen⁴  Jeng-Shiung Chen⁵ 

[1] Battery Research Center of Green Energy, Ming Chi University of Technology, New Taipei, Taiwan;Department of Chemical Engineering and Biotechnology Engineering, National Taipei University of Technology, Taipei, Taiwan;Department of Electronic Engineering, Ming Chi University of Technology, New Taipei, Taiwan;Department of Vehicle Engineering, National Taipei University of Technology, Taipei, Taiwan;Yottadeft Optoelectronics Technology Company Ltd., Taipei, Taiwan;

关键词: Graphite electrode;    Li-ion batteries;    Raman spectroscopy;    two-dimensional mapping;   

DOI  :  10.1109/ACCESS.2021.3085884

来源: DOAJ

【 摘 要 】

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.

【 授权许可】

Unknown