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首页> 外文期刊>Applied Surface Science >Improved electrochemical performance of LiNi0.5Co0.2Mn0.3O2 cathode material by double-layer coating with graphene oxide and V2O5 for lithium-ion batteries
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Improved electrochemical performance of LiNi0.5Co0.2Mn0.3O2 cathode material by double-layer coating with graphene oxide and V2O5 for lithium-ion batteries

机译：通过氧化石墨烯和V2O5的双层涂覆改善锂离子电池LiNi0.5Co0.2Mn0.3O2正极材料的电化学性能

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摘要

LiNi0.5Co0.2Mn0.3O2 cathode material synthesized by a sol-gel method was surface-modified by double-layer coating. The results of X-ray diffraction (XRD) confirm that the intrinsic structure was no change after surface modification. A double-layer structure consisting of an inner V2O5 (VO) layer and an outer conductive graphene oxide (GO) layer was coated on the surface of active material, as confirmed by transmission electron microscopy (TEM). The results of field emission scanning electron microscope (FESEM) equipped with an energy dispersive spectroscope (EDS) show that both graphene oxide and V2O5 uniformly covered LiNi0.5Co0.2Mn0.3O2 cathode material. The double-layer-coated LiNi0.5Co0.2Mn0.3O2 cathode material shows improved electrochemical performance with a capacity retention of 74.2% after 50 cycles in a range of 2.5-4.5 V at 55 degrees C, compared with only 67.8% capacity retention for the pristine material. In addition, the double-layer-coated LiNi0.5Co0.2Mn0.3O2 releases 116.6 mAh g(-1) under a high current rate, while the pristine material only remains at 105.7 mAh g(-1). The results can be ascribed to the double coating layer not only avoids the side reaction between electrolyte and active material but also promotes Li+ and electronic conductivity. Differential capacity (dQ/dV) and electrochemical impedance spectroscopy (EIS) measurements reveal that the double coating layer effectively suppresses the increase of the electrode polarization during cycling. (C) 2017 Elsevier B.V. All rights reserved.
机译：将通过溶胶-凝胶法合成的LiNi0.5Co0.2Mn0.3O2正极材料通过双层涂覆进行表面改性。 X射线衍射（XRD）的结果证实了表面改性后，固有结构没有改变。如通过透射电子显微镜（TEM）所证实的，在活性材料的表面上涂覆了由内部V 2 O 5（VO）层和外部导电石墨烯（GO）层组成的双层结构。配备有能量色散光谱仪（EDS）的场发射扫描电子显微镜（FESEM）的结果表明，氧化石墨烯和V2O5均能均匀覆盖LiNi0.5Co0.2Mn0.3O2阴极材料。双层涂覆的LiNi0.5Co0.2Mn0.3O2正极材料显示出改进的电化学性能，在55°C下在2.5-4.5 V的电压范围内进行50次循环后，其容量保持率为74.2％，而在55°C下仅为67.8％原始材料。此外，双层涂覆的LiNi0.5Co0.2Mn0.3O2在高电流速率下释放116.6 mAh g（-1），而原始材料仅保持在105.7 mAh g（-1）。结果可以归因于双涂层不仅避免了电解质与活性材料之间的副反应，而且促进了Li +和电子导电性。差容量（dQ / dV）和电化学阻抗谱（EIS）测量表明，双涂层有效地抑制了循环过程中电极极化的增加。 （C）2017 Elsevier B.V.保留所有权利。

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