Abstract
Exploring a simple way that can accurately respond to abnormal temperature increase within battery and then promptly shut down the corresponding thermally abused battery is crucial to improving the thermal safety of lithium-ion batteries (LIBs), yet still faces challenges. To counter this, a temperature-sensitive LCO-P3DPY cathode was constructed with a new conductive polymer, i.e., poly(3-decylpyrrole): poly(4-styrenesulfonic acid) (P3DPY: PSS). Safety tests demonstrated that P3DPY exhibited an exceptional positive temperature coefficient (PTC) effect at 100 °C, coinciding with the dangerous occurrence temperature (100 °C) of most LIBs. Consequently, the LCO-P3DPY cathode displayed a significant thermal shutdown in the immediate aftermath of thermal abuse within the battery, showing a capacity output of only 1.7 mAh g−1. Furthermore, LCO-P3DPY cathode not only exhibited excellent electrochemical stability in the battery environment, but also enhanced electrochemical performance, as compared with the traditional batteries at room temperature. After 200 charging-discharging cycles at 0.25C, LCO-P3DPY cathode was able to maintain a reversible capacity of 142.8 mAh g−1, corresponding to a capacity retention rate of 91.83 % that is better than that of blank LCO (62.86 %). This work provides a potential strategy to solve the thermal safety problem and simultaneously improve the electrochemical stability of LIBs.
Published Version
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