综合利用铬铁合金制备复合掺杂磷酸铁锂的研究  

The research of preparing compound doped lithium iron phosphate by comprehensive utilization of chromium iron alloy

作　　者：胡国荣[1] 刘继军[1] 彭忠东[1] 杜柯[1] 曹雁兵[1] 王伟刚[1] 段建国[1] 

机构地区：[1]中南大学冶金与环境学院,长沙410083

出　　处：《功能材料》2014年第11期11148-11152,共5页Journal of Functional Materials

基　　金：湖南省重点科技计划资助项目(2009GK2013)

摘　　要：以铬铁合金为原料,以草酸作为沉淀剂来沉淀铬铁合金浸出液中的Fe,在沉淀Fe的过程中铬铁合金浸出液中微量的Mn、Ni、Co等多种元素被同时沉淀于草酸亚铁中,可以得到掺杂的草酸亚铁Fe(1-x)MxC2O4(M=Ni、Mn、Co等),然后制备得到复合掺杂磷酸铁锂LiFe(1-x)MxPO4/C(M=Ni、Mn、Co等),并对其进行了形貌及电化学性能的测试。电化学测试结果表明,该材料具有良好的电化学性能,0.1 C下的放电容量达到162 mAh/g,1 C下循环50次容量保持率达到98.2%。The oxalic acid was employed to precipitate the ferrum,nickel cobalt and manganese from the leaching sulfate solution of ferrochrome alloy. Small amount of nickel,cobalt and manganese exited in ferrochrome alloy were precipitated simultaneously in ferrous oxalate. The classic solid state route was applied to prepare LiFe（ 1-x）MxPO4/C by using above Fe（ 1-x）MxC2O4as raw material. Crystal structure and charge /discharge performance of LiFe（ 1-x）MxPO4/C were investigated by X-ray diffraction and electrochemical measurement,respectively. The LiFe（ 1-x）MxPO4/C shows the outstanding electrochemical performance. The discharge capacity was 162 mAh /g at the rate of 0. 1 C. When cycled at 1 C for 50times,the capacity retention was 98. 2%.

关 键 词：LIFEPO4 正极材料 铬铁合金 草酸亚铁 

分 类 号：TM912.9[电气工程—电力电子与电力传动]