学术论文

      微通道反应器-固相法制备锂离子电池正极材料LiMnPO4/C

      Preparation of LiMnPO4/C cathode material for lithium ion batteries by a microreactor-solid state process

      摘要:
      采用微通道反应器-固相烧结法制备纳米级磷酸锰锂(LiMnPO4)正极材料.通过微反应器将反应溶液快速混合,得到了颗粒较小的前驱体产物Mn3(PO4)2?3H2O,通过与锂源、碳源球磨混合,固相烧结得到最终产物LiMnPO4/C.通过X线衍射仪(XRD)、场发射扫描电子显微镜(FESEM)、透射电子显微镜(TEM)以及恒电流充放电对样品进行表征和电化学性能测试,考察不同煅烧温度对LiMnPO4/C的颗粒尺寸及电化学性能的影响.结果表明:在650 ℃条件下制备出的样品具有最小的颗粒尺寸以及最佳的电化学性能,在0.05C (1C=171 mA?h/g)倍率下的首次放电比容量为121 mA?h/g,经20次循环后容量保持率为86.8%.
      Abstract:
      Nano-sized LiMnPO4 cathode material was prepared by a microreactor-solid state method.The Mn3(PO4)2?3H2O particles,obtained by mixing two reactant solutions rapidly in a microreactor,were ball-milled with lithium and carbon sources to prepare the precursors,and the mixture was sintered under high temperatures to obtain the product LiMnPO4/C.The effects of various calcination temperatures on the particle size and electrochemical performance of LiMnPO4/C were characterized by X-ray diffraction (XRD),field emission scanning electron microscope (FESEM),transmission electron microscopy (TEM) and galvanostatic charge-discharge test.Results showed that the LiMnPO4/C calcined at 650 ℃ exhibited the smallest particle size and the best electrochemical performance.The initial discharge capacity of this sample was 121 mA?h/g at 0.05C rate (1C=171 mA?h/g),which kept the capacity retention ratio of 86.8% after 20 cycles.
      Author: CHEN Yunchao YU Yong WANG Guojing LIU Xiaomin YANG Hui
      作者单位: 南京工业大学 材料科学与工程学院,江苏南京,210009
      年,卷(期): 2017, 39(3)
      分类号: TM911
      在线出版日期: 2017年7月3日
      基金项目: 国家自然科学基金,江苏省自然科学基金重点项目,江苏高校优势学科建设工程