溶剂热法合成Li3V2（PO4）3的形貌及粒径控制研究  

Impact Factors on Morphology and Particle Size of Lithium Vanadium Phosphate during Solvothermal Synthesis

作　　者：刘德明 李诗凯 唐佳杰 周南[2] 钟美娥[2] LIU De-ming;LI Shi-kai;TANG Jia-jie;ZHOU Nan;ZHONG Mei-e(Analysis and Testing Center of Hunan Agricultural University,Hunan Changsha 410182;College of Science,Hunan Agricultural University,Hunan Changsha 410182,China)

机构地区：[1]湖南农业大学分析测试中心,湖南长沙410128 [2]湖南农业大学理学院,湖南长沙410128

出　　处：《广州化工》2019年第20期55-58,共4页GuangZhou Chemical Industry

基　　金：国家自然科学基金(51703061);湖南省自然科学基金(2017JJ3103);中国博士后科学基金(2016M592427)

摘　　要：Li3V2(PO4)3因其突出的理论比容量和较高的工作电压,被认为是极具应用潜力的新一代锂离子电池正极材料之一.本实验以LiOH,NH4H2PO4和NH4VO3为反应原料,通过溶剂热法合成Li3V2(PO4)3(LVP)正极材料.探讨了原料的添加顺序,溶剂的种类和比例,反应温度以及保温时间对LVP形貌和粒径的影响.利用扫描电镜观察其形貌和粒径,采用X射线衍射仪表征其晶体结构.实验结果表明:所用溶剂对LVP材料的结构和形貌有显著影响.当选择乙二醇与水混合物(EG:H2 O=1:1)作溶剂,在200℃下反应6 h时,可获得粒径小而均匀的LVP微球.Li3V2 (PO4)3 has attracted extensive interest as one of the most promising cathode materials for lithium-ion batteries due to its remarkable theoretical capacity and high operating voltage. Li3V2(PO4)3 (LVP) was synthesized by using LiOH, NH 4H 2PO 4 and NH4VO3 as reaction materials through solvothermal method. To investigate the impact factors on the morphology and particle size of Li3V2 (PO4)3 during solvothermal synthesis, the category and ratio of solvent, the adding sequence of raw materials and the temperature, as well as the reaction duration, were investigated to the controllable synthesis of LVP. The morphology and particle sizes were characterized by scanning electron microscopy (SEM), and the crystal structure of the obtained products were analyzed via X-ray diffraction (XRD). Results confirmed that the reaction conditions, especially the synthesis media, had significant effects on the purity and appearance of LVP products. Spherical LVP can be obtained under 200 ℃ for 6 h by using EG/H 2O (1:1) as solvent.

关 键 词：溶剂热法 影响因素 磷酸钒锂 微球 

分 类 号：O646[理学—物理化学]