Electrochemical Properties for Co-Doped Pyrite with High Conductivity
Electrochemical Properties for Co-Doped Pyrite with High Conductivity
复制标题
高电导共掺杂黄铁矿的电化学性能
DOI：
10.3390/en8099584
复制
发表时间：
2015-09-01
期刊：
影响因子：
3.2
通讯作者：
Wang, Shengping
中科院分区：
文献类型：
--
作者：
Liu, Yongchao;Wang, Shengping
本文采用水热法制备了纳米结构的共掺杂黄铁矿（fes2）。利用x射线衍射仪（XRD）和扫描电镜（SEM）对合成材料的结构性能和形貌进行了表征。在FeS 2的晶格中加入Co，可以改变晶体颗粒不同晶面的生长速度，形成各种面清晰轮廓分明的多面体。此外，通过恒流放电试验、循环伏安法和电化学阻抗谱对掺杂黄铁矿的Li/FeS 2电池的电化学性能进行了评价。结果表明，当掺杂率为7%时，掺杂材料的放电容量（801.8 mAh·g−1）明显高于原始FeS 2的放电容量（574.6 mAh·g−1）。因此，掺杂方法对于提高FeS 2的电化学性能具有潜在的有效性。
In this paper, the hydrothermal method was adopted to synthesize nanostructure Co-doped pyrite (FeS 2 ). The structural properties and morphology of the synthesized materials were characterized using X-ray diffraction (XRD) and scanning electron microscopy (SEM), respectively. Co in the crystal lattice of FeS 2 could change the growth rate of different crystal planes of the crystal particles, which resulted in various polyhedrons with clear faces and sharp outlines. In addition, the electrochemical performance of the doping pyrite in Li/FeS 2 batteries was evaluated using the galvanostatic discharge test, cyclic voltammetry and electrochemical impedance spectroscopy. The results showed that the discharge capacity of the doped material (801.8 mAh·g −1 ) with a doping ratio of 7% was significantly higher than that of the original FeS 2 (574.6 mAh·g −1 ) because of the enhanced conductivity. Therefore, the doping method is potentially effective for improving the electrochemical performance of FeS 2 .