Nitrogen-doped graphene guided formation of monodisperse microspheres of LiFePO4 nanoplates as the positive electrode material of lithium-ion batteries
Nitrogen-doped graphene guided formation of monodisperse microspheres of LiFePO4 nanoplates as the positive electrode material of lithium-ion batteries
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氮掺杂石墨烯引导形成LiFePO4纳米片单分散微球作为锂离子电池正极材料
DOI：
10.1039/c6ta03440c
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发表时间：
2016-08
影响因子：
11.9
通讯作者：
Xiaohui Tian
中科院分区：
文献类型：
--
作者：
Yingke Zhou;Jiming Lu;Chengji Deng;Hongxi Zhu;George Z. Chen;Shaowei Zhang;Xiaohui Tian
采用溶剂热法合成了LiFePO 4和氮掺杂石墨烯的三维多孔复合微球。采用扫描电子显微镜、X射线衍射仪、透射电子显微镜和X射线光电子能谱仪对复合材料的形貌和微观结构进行了研究。通过恒电流充放电、循环伏安和交流阻抗等测试手段对材料的电化学性能进行了研究。通过氮掺杂石墨烯和LiFePO 4纳米片的组装构建了独特的多孔结构的微球，可以显著增大电极/电解质界面面积，促进电子传递过程，缩短离子扩散路径，加速离子在整个电极中的传输。在电化学测试中，所制备的多孔复合微球材料具有良好的充电比容量、倍率性能和循环稳定性，在高性能锂离子动力电池中具有良好的应用前景。
Three-dimensional porous composite microspheres of LiFePO4 and nitrogen-doped graphene have been synthesized by a solvothermal process coupled with subsequent calcination. The morphology and microstructure of the composites were investigated by scanning electron microscopy, X-ray diffraction, transmission electron microscopy and X-ray photoelectron spectroscopy. The electrochemical properties were evaluated by constant current charge/discharge tests, cyclic voltammetry and electrochemical impedance spectroscopy. The unique porous structure of the microspheres was constructed by the assembly of nitrogen-doped graphene and LiFePO4 nanoplates and can remarkably enlarge the electrode/electrolyte interface area, facilitate the electron transfer process, shorten the ionic diffusion path and accelerate the ionic transport throughout the electrode. In electrochemical measurements of the specific charge capacity, rate capability and cycling stability, the obtained porous composite microsphere materials offer remarkably promising results for applications in high-performance lithium-ion power batteries.
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