钒掺杂对溶剂热合成LiFePO_4结构和性能的影响  

Structural and Electrochemical Characterization of Vanadium-Doped LiFePO_4 via Solvothermal Synthesis

作　　者：黄贤坤[1] 何向明[2] 姜长印[2] 刘永忠[1] 

机构地区：[1]西安交通大学化学工程与技术学院,西安710049 [2]清华大学核能与新能源技术研究院,北京100084

出　　处：《重庆理工大学学报（自然科学）》2015年第7期19-23,共5页Journal of Chongqing University of Technology：Natural Science

基　　金：国家"973计划"资助项目(2013CB934000);科技部国际科技合作计划资助项目(2014DFG71590)

摘　　要：在溶剂热条件下以VOSO4为钒源制备出一系列钒掺杂磷酸铁锂纳米颗粒。利用电感耦合等离子体发射光谱(ICP-OES)、X射线衍射(XRD)和扫描电子显微镜(SEM)等分别对产物的组成、结构及形貌进行表征。结果表明:溶剂热条件下钒掺杂磷酸铁锂可行;钒掺杂量为原料中钒含量的75%;钒进入磷酸铁锂晶格内占据Fe空位和Li空位;钒掺杂后的磷酸铁锂样品的颗粒粒径变小,易团聚,样品中V含量高于3.8%时发生明显团聚,所得掺杂样品的电化学性能不佳。A series of vanadium-doped LiFePO4 samples were synthesized using solvothermal method with VOSO4 as vanadium sources. Elements＇ content, structures and morphologies of samples were characterized via Inductively Coupled Plasma Optical Emission Spectrometer （ICP-OES）, X-ray diffraction （XRD） and scanning electron microscope （SEM）. Analysis results show that it＇ s possible for vanadium-doped LiFePO4 under solvothermal conditions ; the content of vanadium is 75 % of that in raw materials; Fe vacancy and Li vacancy are occupied by V in sample lattices; particle sizes turns to be smaller with vanadium doped into lattice and therefore results in particle agglomeration, especially with vanadium content over 3.8% , and this also results in bad electrochemical performances.

关 键 词：钒掺杂 磷酸铁锂 溶剂热 

分 类 号：TQ152[化学工程—电化学工业]