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Synergistic effect of Li 2 MgTi 3 O 8 coating layer with dual ionic surface doping to improve electrochemical performance of LiNi 0.6 Co 0.2 Mn 0.2 O 2 cathode materials
Ionics ( IF 2.4 ) Pub Date : 2020-06-20 , DOI: 10.1007/s11581-020-03665-8
Leiwu Tian , Haifeng Yuan , Qinjun Shao , Syed Danish Ali Zaidi , Chong Wang , Jian Chen

Surface modification plays a vital role in improving the rate performance and cycling stability of layered Ni-rich LiNi0.6Co0.2Mn0.2O2 (NCM622) cathode materials for Li-ion batteries. In this study, Li2MgTi3O8 (LMTO)-coated NCM622 was successfully synthesized by wet coating combined with sintering process. The results of morphological analysis showed a uniform LMTO layer coated on the surface of NCM622 materials. The dual ions of Ti4+ and Mg2+ on surface structure of NCM622 were identified by X-ray diffraction and X-ray photoelectron spectroscopy. The surface coating layer prevented the direct contact between the active cathode material and the electrolyte which significantly reduced the side reactions, and the doping of Ti4+ and Mg2+ improved the structural stability of the NCM622 materials. The electrochemical performance indicates that NCM622 cathode with a coating layer of 0.5 wt% LMTO exhibited excellent cycle stability and maintained a capacity retention up to 76% after 200 cycles at 25 °C at 1 C-rate, which was higher than the value of 52% for the NCM622.



中文翻译:

Li 2 MgTi 3 O 8涂层与双离子表面掺杂的协同效应改善LiNi 0.6 Co 0.2 Mn 0.2 O 2正极材料的电化学性能

表面改性在改善锂离子电池用层状富镍NiNi 0.6 Co 0.2 Mn 0.2 O 2(NCM622)正极材料的倍率性能和循环稳定性方面起着至关重要的作用。本研究通过湿法涂层结合烧结工艺成功合成了Li 2 MgTi 3 O 8(LMTO)涂层的NCM622。形态分析的结果表明,在NCM622材料的表面上涂覆了均匀的LMTO层。Ti 4+和Mg 2+的双离子用X射线衍射和X射线光电子能谱鉴定了NCM622的表面结构。表面涂层阻止了活性阴极材料与电解质之间的直接接触,从而大大减少了副反应,并且Ti 4+和Mg 2+的掺杂提高了NCM622材料的结构稳定性。电化学性能表明,具有0.5 wt%LMTO涂层的NCM622阴极表现出优异的循环稳定性,并在25°C下以1 C速率进行200次循环后,其容量保持率高达76%,高于52的值。 NCM622的%。

更新日期:2020-06-22
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