Journal
JOURNAL OF ENERGY STORAGE
Volume 72, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.est.2023.108634
Keywords
Pre -overcharge; Laser-induced plasma spectroscopy (LIPS); Lithium -ion battery; Nickel-rich cathode; State -of -Charge (SOC); Opto-chemical sensor
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Using calibration-free atomic spectroscopic technique, Li ion signals at varying state of charge from high-nickel batteries are detected in real-time. The sudden change in Li ion concentration as the state of charge reaches above 75% is indicative of the state of overcharge. This study aims to develop a new opto-chemical SOC sensor and provides a new method for detecting the state of pre-overcharge in nickel-rich Li-ion batteries.
Using the calibration-free atomic spectroscopic technique on lithium (Li) I with its wavelengths at 610.35, 610.65, and 670.79 nm, Li ion signals at varying state of charge (SOC) from high-nickel (>88 %) batteries with NCA (Ni-Co-Al) cathode and SCN (silicon carbon nanocomposite) anode are detected in real-time (<3 s). The laser-induced plasma spectroscopy (LIPS) revealed that moderate changes in the concentrations of Li and metals (Ni, Co, and Al) during the normal charging underwent an abrupt concentration change in Li as the SOC reached above 75 %. Verified by using SEM-EDS (Scanning Electron Microscopy-Energy Dispersive Spectrometer), this sudden decrease of Li ions in cathode is deemed as being indicative of the state of overcharge. The present work is aimed at developing a new opto-chemical SOC sensor while the experimental set up offers a new method for detecting the state of pre-overcharge in nickel-rich Li-ion batteries.
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