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Reviving Aged Lithium‐Ion Batteries and Prolonging their Cycle Life by Sinusoidal Waveform Charging Strategy
Author(s) -
Chen PoTuan,
Yang FangHaur,
Cao ZhongTing,
Jhang JyunMing,
Gao HongMin,
Yang MoHua,
Huang K. David
Publication year - 2019
Publication title -
batteries and supercaps
Language(s) - English
Resource type - Journals
ISSN - 2566-6223
DOI - 10.1002/batt.201900022
Subject(s) - waveform , voltage , constant current , battery (electricity) , passivation , internal resistance , ion , electrical engineering , power (physics) , trickle charging , lithium (medication) , materials science , electrical impedance , lithium ion battery , chemistry , layer (electronics) , engineering , physics , nanotechnology , medicine , organic chemistry , quantum mechanics , endocrinology
Traditional high power constant current‐constant voltage (CC−CV) charging leads to the degradation of Li‐ion batteries. Thus, aging due to charging is a primary issue to be overcome in application technology. This study proposes the impacts of a sinusoidal waveform charging strategy for charging Li‐ion batteries. Specifically, a negative voltage is introduced in the charging process to reverse passivation layer formation. After few cycles of sinusoidal waveform charging, aged cells can be revived. Tests reveal that the available capacity of an aged cell can be improved by a maximum of 18.7 % relative to the original rated power. After 600 charging‐discharging cycles of new cells, the cells charged using the sinusoidal waveform strategy possess approximately 15 % more electrical capacity than do cells charged using the conventional CC−CV method, indicating an increase in battery cycle life. The suppression of interfacial resistance is characterized by electrochemical impedance spectroscopy. Sinusoidal waveform charging can reduce charging time by half and the maximum rise in temperature by 6 °C compared with the CC−CV charging method.