Synthesis and electrochemical properties of multi-doped LiFePO4/C prepared from the steel slag
Synthesis and electrochemical properties of multi-doped LiFePO4/C prepared from the steel slag
复制标题
DOI：
10.1016/j.jpowsour.2009.11.058
复制
发表时间：
2010-05
影响因子：
9.2
通讯作者：
Zhao-jin Wu;H. Yue;Liao-sha Li;B. Jiang;Xing-rong Wu;Ping Wang
中科院分区：
文献类型：
--
作者：
Zhao-jin Wu;H. Yue;Liao-sha Li;B. Jiang;Xing-rong Wu;Ping Wang
本文提出并讨论了一种以钢渣为原料合成多掺杂LiFePO4/C复合材料的新路线。采用选择性碳热法从炉渣中回收了具有合适摩尔比的Fe、Mn、V、Cr的铁合金，并成功地作为Fe和多种掺杂剂的原料制备了多掺杂LiFePO4/C。 XRD和Rietveld精修结果表明，多掺杂LiFePO4/C为单橄榄石型相，结晶良好，Mn、V和Cr原子占据Fe位。元素映射图像证实元素（Fe、P、Mn、V 和 Cr）均匀分布在多掺杂 LiFePO4/C 颗粒中。通过恒电流充放电和循环伏安测试评价所制备正极的电化学性能。与仅通过化学试剂制备的未掺杂LiFePO4/C相比，由于多掺杂提高了电极反应性，多掺杂LiFePO4/C随着充放电电流密度的增加表现出较小的容量下降。结果表明，钢渣是制备多掺杂 LiFePO4/C 的铁和掺杂剂的丰富且廉价的来源。
The paper presents and discusses a novel route to synthesize a multi-doped LiFePO4/C composite by using steel slag as a raw material. A ferroalloy with suitable molar ratio of Fe, Mn, V, and Cr is recovered from the slag by a selective carbothermic method, and successfully used as source materials of Fe and multiple dopants for preparing the multi-doped LiFePO4/C. XRD and Rietveld-refined results show that the multi-doped LiFePO4/C is single olivine-type phase and well crystallized, Mn, V, and Cr atoms occupy Fe site. Elemental mapping image confirms that the elements (Fe, P, Mn, V, and Cr) distribute homogeneously in particles of the multi-doped LiFePO4/C. The electrochemical performance of prepared cathode was evaluated by galvanostatic charge/discharge and cyclic voltammogram tests. Compared to the undoped LiFePO4/C prepared only by chemical reagents, the multi-doped LiFePO4/C exhibits lesser capacity drops with increasing of charge/discharge current density due to the improvement of the electrode reactivity by multi-doping. The results suggest that steel slag is an abundant and inexpensive source materials of iron and dopants for preparing multi-doped LiFePO4/C.