MnO_2掺杂Bi（Ⅴ）电极材料的制备与性能

摘要

以MnSO4、Bi（NO3）3为原料,在碱性条件下与NaClO反应,制备了掺杂Bi（V）的MnO2电极材料,实验比较了NaClO、Bi（NO3）3、NaOH浓度,反应时间等条件改变对电极材料充放电性能的影响。实验表明,掺杂了Bi（V）的MnO2试样,经恒电流充放电测试其充放电容量可达272 mAh.g-1,远高于未掺杂的MnO2电极材料,且二次放电容量仍可达一次容量的93%。表明在本实验条件下制备的掺杂少量Bi（V）的MnO2电极材料,放电容量明显提高,且循环性能也有一定的改善。%MnO2-doped Bi（V） composite electrode material was prepared with MnSO4 and Bi（NO3）3 by reaction of NaClO under alkalic condition.The effect of reactant concentration,reaction time and other factors on electrochemical performance of electrode materials was studied.The charge-discharge capacity of the composite was 272 mAh·g-1 at current density of 62.5 mA·g-1,which was far higher than that of no doped Bi（V） electrode materials.Moreover,the second discharge capacity reached 93% of the first one.The results showed that the charge-discharge capacity and cyclability of the sample were improved significantly when the MnO2 electrode materials doped with a small amount of Bi（V）.