PPy对Al掺杂MnO_(2)电极材料电化学性能的影响

Effect of PPy on electrochemical properties of Al-doped MnO_(2) electrode materials

利用水热法制备Al 3+掺杂MnO_(2),再通过低温原位聚合法将其与聚吡咯(PPy)进行复合,制得了Al掺杂MnO_(2)/PPy复合电极材料,并对该复合材料进行了结构和形貌表征以及电化学性能测试.结果表明,Al掺杂MnO_(2)/PPy复合材料相比于Al掺杂MnO_(2)有更好的电化学性能.Al掺杂的MnO_(2)与PPy质量复合比为6∶1的电极(A0.45M6P1)在1 A/g的电流密度下比电容可达273.56 F/g,电流密度从1 A/g增加至10 A/g时比电容保持率为77.89%,在10 A/g下经过10000次循环后比电容保持率为93.2%.复合材料性能的改善主要归功于PPy为充放电过程中的电子提供了快速传输的路径,在MnO_(2)的纳米片上复合上一层PPy有利于缓解MnO_(2)在充放电过程中离子嵌入/脱出带来的体积效应.

In this paper,Al 3+doped MnO_(2)was prepared by hydrothermal method,and then it was combined with PPy by low temperature in situ polymerization.Al-doped MnO_(2)/PPy composite electrode material was prepared.The structure,morphology and electrochemical properties of the composites were investigated.The results show that Al-doped MnO_(2)/PPy composites have better electrochemical performance than Al-doped MnO_(2)composites.At 1 A/g current density,the specific capacitance of Al-doped MnO_(2)and PPy electrode(A0.45M6P1)with a mass recombination ratio of 6∶1 can reach 273.56 F/g.When the current density increases from 1 A/g to 10 A/g,the specific capacitance retention rate is 77.89%.After 10000 cycles at 10 A/g,the specific capacitance retention rate is 93.2%.The improvement of the performance of the composite material is mainly attributed to the rapid transmission path of PPy for the electrons in the process of charging and discharging.The composite layer of PPy on MnO_(2)nanosheets is beneficial to alleviate the volume effect caused by the ion embedding/removal of MnO_(2)in the process of charging and discharging.