Abstract The conductive polymers PEDOT:PSS coated Li1.20[Mn0.53Ni0.13Co0.13Nb0.01]O2 cathode materials were synthesized via using the sol-gel method, followed by the wet solution process. And the X-ray diffraction (XRD), Rietveld refinement, Scanning electron microscopy (SEM), Transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS) were adopted to investigate the morphology and constituents of as-prepared cathode materials. The results demonstrated that a PEDOT:PSS layer was uniformly distributed on the surface of bulk Li1.20Mn0.54Ni0.13Co0.13O2 with Nb5+ doping successfully. And the PEDOT:PSS surface coating and Nb5+ doping modifications showed a significant improvement on the electrochemical properties of cathode. In particular, the 2 wt% PEDOT:PSS coated Li1.20[Mn0.53Ni0.13Co0.13Nb0.01]O2 delivered a supernal discharge capacity of 145.6 mAhg−1 at 5C high rate and retained a high capacity retention of 90.8% after 200 cycles at 45 °C, which were more superior than those of the pristine cathode (90.2 mAhg−1 and 80.7%). The enhanced electrochemical properties could be attributed to the facilitation of Lithium ions diffusion, the lower cation mixing and restriction of the side reactions between cathode surfaces with electrolyte by the Nb5+ doping and PEDOT:PSS coating.

中文翻译：

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Nb5+ 掺杂的 Li1.20Mn0.54Ni0.13Co0.13O2 与聚（3,4-乙撑二氧噻吩）：聚（苯乙烯磺酸盐）表面改性作为锂离子电池的高级正极材料

摘要 采用溶胶-凝胶法和湿法溶液法合成了导电聚合物PEDOT:PSS包覆的Li1.20[Mn0.53Ni0.13Co0.13Nb0.01]O2正极材料。并采用 X 射线衍射 (XRD)、Rietveld 精修、扫描电子显微镜 (SEM)、透射电子显微镜 (TEM)、X 射线光电子能谱 (XPS) 来研究所制备正极材料的形貌和成分。结果表明，PEDOT:PSS 层均匀分布在块体 Li1.20Mn0.54Ni0.13Co0.13O2 表面，Nb5+ 掺杂成功。PEDOT:PSS 表面涂层和 Nb5+ 掺杂改性显示出阴极电化学性能的显着改善。特别地，2wt% PEDOT:PSS涂覆的Li1.20[Mn0.53Ni0.13Co0.13Nb0.53Ni0.13Co0.13Nb0。01]O2 在 5C 高倍率下提供 145.6 mAhg-1 的超外放电容量，并在 45 °C 下循环 200 次后仍保持 90.8% 的高容量保持率，这比原始正极（90.2 mAhg-1 80.7%）。增强的电化学性能可归因于锂离子扩散的促进、较低的阳离子混合以及通过 Nb5+ 掺杂和 PEDOT:PSS 涂层限制阴极表面与电解质之间的副反应。