铁掺杂对磷酸锰锂电化学性能的影响

发布时间：2018-03-12 12:02

本文选题：锂二次电池　切入点：磷酸锰锂　出处：《硅酸盐学报》2014年02期 　论文类型：期刊论文

【摘要】：利用球磨-固相烧结法制备出一系列不同铁掺杂量的LiMn(1-x)Fex PO4(x=0~1.0)材料,并利用X射线衍射、扫描电子显微镜对所得样品结构和形貌进行表征。以所得材料为锂二次电池正极组装电池,并运用恒流充放电、循环伏安对其电化学性能进行测试。结果表明:所得LiMn(1-x)Fex PO4材料均呈现单一均相橄榄石结构;其粒径为50~100nm,粒径分布均匀。未经铁掺杂的LiMnPO4比容量仅为19.3mA·h/g,比能量仅为71.20mW·h/g,经铁掺杂后材料的比容量和比能量都获得显著提高,当x=0.4时,LiMn0.6Fe0.4PO4的比容量为133.6mA·h/g,比能量达到483.58mW·h/g。比容量和比能量随着铁掺杂量的提高而产生的增量分别符合指数递减和倒S型曲线。
[Abstract]:A series of iron-doped LiMn(1-x)Fex PO _ 4O _ 4O _ 2O _ (1.0) materials were prepared by ball milling and solid state sintering. The structure and morphology of the samples were characterized by X-ray diffraction and scanning electron microscope. The electrochemical properties of LiMn(1-x)Fex PO4 were measured by constant current charge-discharge and cyclic voltammetry. The results showed that all the LiMn(1-x)Fex PO4 materials had a single homogeneous olivine structure. The specific capacity and specific energy of iron-doped LiMnPO4 were only 19.3mA 路h / g and 71.20mW 路h / g, respectively. The specific capacity and specific energy of LiMn0.6Fe0.4PO4 are 133.6 Ma 路h / g and 483.58 MW 路h / g, respectively. The increment of specific capacity and specific energy with the increase of iron doping content is in accordance with exponential decline and inverted S-type curves, respectively, when the specific capacity and specific energy of LiMn0.6Fe0.4PO4 are 133.6 Ma 路h / g and 483.58 MW 路h / g, respectively.
【作者单位】：河北工业大学高分子科学与工程研究所;
【基金】：国家自然科学基金(51203041) 河北省教育厅高校科学技术研究重点项目(ZH2012026) 河北省人社厅留学人员择优资助项目(201206)
【分类号】：TM912

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