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首页> 外文期刊>Journal of power sources >Electrochemical Performance Of Polypyrrole/silver Vanadium Oxide Composite Cathodes In Lithium Primary Batteries
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Electrochemical Performance Of Polypyrrole/silver Vanadium Oxide Composite Cathodes In Lithium Primary Batteries

机译：聚吡咯/银钒氧化物复合正极在锂一次电池中的电化学性能

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摘要

Polypyrrole (PPy)/silver vanadium oxide (SVO) composite cathode materials were synthesized by polymerizing pyrrole onto the surface of pure SVO particles. Electrochemical characterization was carried out by performing galvanostatic discharge, pulse discharge and ac-impedance experiments. The composite electrode exhibited better performance than pristine SVO in all the experiments. The composite electrodes yielded a higher discharge capacity and a better pulse discharge capability when compared to the pristine SVO electrode. The pulse discharge and ac-impedance studies indicated that PPy forms an effective conductive network on the SVO surface and thereby reduces the particle-to-particle contact resistance and facilitates the interfacial charge transfer kinetics. To determine the thermal stability of the composite cathode, galvanostatic discharge and ac-impedance experiments were performed at different temperatures. The capacity increased with temperature due to enhanced charge transfer kinetics and low mass transfer limitations. The peak capacity was obtained at 60 ℃, after which the performance degraded with any further increase in temperature.
机译：通过将吡咯聚合到纯SVO颗粒的表面上，合成了聚吡咯（PPy）/银钒氧化物（SVO）复合阴极材料。通过进行恒电流放电，脉冲放电和交流阻抗实验进行电化学表征。在所有实验中，复合电极的性能均优于原始SVO。与原始SVO电极相比，复合电极具有更高的放电容量和更好的脉冲放电能力。脉冲放电和交流阻抗研究表明，PPy在SVO表面形成有效的导电网络，从而降低了颗粒间的接触电阻并促进了界面电荷转移动力学。为了确定复合阴极的热稳定性，在不同温度下进行了恒电流放电和交流阻抗实验。由于增强的电荷转移动力学和较低的质量转移限制，容量随温度增加。在60℃时达到峰值容量，之后温度进一步升高，性能下降。

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