INVESTIGATION OF ELECTROCHEMICAL-THERMAL COUPLING IN LIFEPO₄ BATTERIES USING A REFERENCE ELECTRODE UNDER FAST-CHARGING CONDITIONS
Keywords:
Lithium-ion battery, LiFePO₄, Reference electrode, Fast charging, Anode potential, Thermal behavior, Lithium plating, Battery safetyAbstract
The increasing demand for rapid charging of lithium-ion batteries has intensified
concerns regarding lithium plating, accelerated degradation, and thermal safety.
Conventional battery monitoring systems primarily rely on cell voltage and
temperature measurements, which provide limited information about the
electrochemical state of individual electrodes. In this study, a three-electrode LiFePO₄
graphite battery incorporating a reference electrode was employed to investigate the
relationship between anode potential evolution and thermal behavior during charging.
Simultaneous measurements of anode potential, internal temperature, and surface
temperature were performed under different charging conditions [1]. The results
demonstrate that increasing charging current significantly reduces anode potential
while increasing the temperature difference between the battery core and surface.
Analysis indicates that changes in anode potential occur prior to significant thermal
responses, suggesting that electrochemical signals can serve as early indicators of
lithium plating risk and thermal instability.
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