Suppressing Anodic Degradation of Lithium-Ion Batteries by Sinusoidal Waveform Charging Method

Abstract

The effects of Constant current-Constant voltage charging and combined sinusoidal waveform charging methods on the internal structure of LiFePO 4 battery have been discussed in detail in this study. Experimental results clearly indicated that after 600 cycles, the battery that utilized the charging method had retained about 94% of state of health. In the electrochemical impedance analysis and cyclic voltammetry tests, the portion of the SEI film impedance was increased about 0.08 mΩ. In the micro structured view, no significant SEI film formation was observed on the surface of the negative electrode that used the battery in the present charging method. Finally, in the analysis of the SEI film composition, it was found that the Li 2 CO 3 and Li 2 O content in the Li element was only about 15.97% and 4.42% in the battery employing this charging method, and the battery component contents in the CC-CV charging method were 27.2% and 6.69% respectively.

Perspective of material evolution Induced by sinusoidal reflex charging in lithium-ion batteries

“…Impedance increases by Sangeetha et al . [ 26 ], are in accordance with this study, where during the 100th cycle, under CC-CV charging and room temperature, the impedance of every part of the Li-battery increased. By 400th cycle, the CC-CV method had impacted a 0.94Ω of impedance compared to only 0.08 Ω by the sinusoidal charging.…”

“…Meanwhile, the CC-Sinusoidal charging method started with a slight decrease in capacitance to 96.73 % after approximately 400 cycles, which was higher than that of the CC-CV charging method. A significant previous research study from our team was performed to suppress the anode electrode degradation in Li batteries by sinusoidal charging method [ 26 ] . The batteries were charged for 600 charge discharge cycles and the capacitance measured in CC-CV was 80 %, whereas that of sinusoidal was well ahead with 94 %, thus revealing that it was the advantageous method.…”