LiV3O8 V25锂离子电池正极材料的制备及电化学性能研究.docx

形貌，推测海胆结构的形成机理。实验表明：通过控制反应溶液的浓度，有 机醇的种类及热处理工艺，能够调控海胆球的尺寸、疏密程度及自组装纳米 棒的直径。其中，以去离子水为溶剂，加入等体积的乙二醇，调节反应溶液 的pH至2．0，经350 oC热处理2 h制备出结构疏松的海胆状V205。在lC 条件下，可逆容量为231．6 mAh g一，50次循环后容量保持率约94．4％(218．6 mAh g。1)。其中，加入聚乙烯醇制得的产物，在低倍率下具有较高的放电比 容量(0．1C：318．0 mAh g-i；0．2C：256．9 mAh g～；0．5C：227．3 mAh g一1)， 而加入乙醇制备的产物在高倍率(5C)条件下具有较高的放电比容量(81．2 mAhg一)和循环稳定性。 关键词：锂离子电池，正极材料，LiV308，V205，油浴法 II 万方数据  Synthesis and Electrochemical Properties of LiV308 and VzOs Cathode Materials for Lithium Ion Batteries ABSTRACT In the past few years，the severe weather changes，such as global warming and hazy,have made all the people realize the danger of the bad weather and the urgency of using clean energy．Lithium-ion battery is outstanding among the new energy resources(solar and wind power)，owning to its excellent electrochemical performance，safety,light mass and high design flexibility．And it has been applied in portable electronic devices，electric vehicles，large power grid and other energy storage systems． Owning to the typical lamellar structure．Vanadium．based materials (Vanadate Vanadium，Ammonium Vanadate Oxidation，etc．)Can be used in lithium-ion battery,supercapacitors and catalysis，presenting a wide application prospect．For the electrode materials，the structure，size and morphology have great influence on the electrochemical performance，and the electrode materials al e strongly affected by the preparation technology．IIl Our study，LiV308 and 踢05 with controlled size。structure and morphology were synthesized by controlling different preparation process．Meanwhile，the phase，size and morphology of the products were explored by X—ray diffraction(XRD)and scanning electron microscopy(SEM)，and the electrochemical performance was tested by the constant current charge and discharge device test，cyclic voltammograms(cv)and impedance spectroscopy(EIS)． (1)LiV30s was prepared by sol—gel method．The influence of thermal treatment temperature，thermal treatment time and the templates on the phase， size，morpholog