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Tarascon JM, Armand M (2001) Issues and challenges facing rechargeable lithium batteries. 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 ☌ at 1 C-rate, which was higher than the value of 52% for the NCM622. 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 Ti 4+ and Mg 2+ improved the structural stability of the NCM622 materials. The dual ions of Ti 4+ and Mg 2+ on surface structure of NCM622 were identified by X-ray diffraction and X-ray photoelectron spectroscopy. The results of morphological analysis showed a uniform LMTO layer coated on the surface of NCM622 materials. In this study, Li 2MgTi 3O 8 (LMTO)-coated NCM622 was successfully synthesized by wet coating combined with sintering process. Surface modification plays a vital role in improving the rate performance and cycling stability of layered Ni-rich LiNi 0.6Co 0.2Mn 0.2O 2 (NCM622) cathode materials for Li-ion batteries.
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