Composite Sinusoidal Waveform Generated by Direct Digital Synthesis for Healthy Charging of Lithium-Ion Batteries

Abstract

To address the defects in lithium-ion battery lifespan, this paper proposes a composite waveform generation strategy that offers capacity-recovering effect. Based on digital architecture, this study exploits direct digital synthesis (DDS) to generate data, which are then processed in an analog-to-digital converter to produce a predefined voltage waveform signal. In the process, an arbitrary waveform is converted to digital voltage waveform signal through pulse width modulation (PWM) technology, thus realizing waveform generation through DDS. Subsequently, analog-to-digital conversion is accomplished by going through a buck circuit, resulting in a composite sinusoidal waveform that is used to charge the battery with a recovering effect. This paper comprises an introduction of effective waveforms for capacity recovering, methods of generating composite sinusoidal waveforms, and an example of the application of composite sinusoidal waveform generation. The waveform produced by the circuit may recover the capacity of an aged 18650 lithium-ion battery by about 8%.

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

“…However, as the number of charges and discharges increased, the distance between the electrode d 002 layers under both charging methods deviated from the ideal value, resulting in a more severe depart from the CC-CV charging method. Erstwhile study from our team [ 38 ] , have determined through Lorentz fitting intensity ratios that the 2D-band concomitant with graphitic layers of the electrode was adjacently interconnected to the intercalation of Li ion them and this made the fact clear that the sinusoidal charging method had a great role to play in subduing this interjection than the other CC-CV technique.

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