High-voltage LiCoO2 has attracted much interest owing to the high specific energy density. But the poor cycling performance and inferior rate capacity of LiCoO2 at a high voltage (≥4.5 V) has restricted the practical applications. Herein, we propose to improve
the electrochemical performances of LiCoO2 at high voltage through a synergy of Al-doping and Li2TiO3-coating. In compared to bare LiCoO2, Al-doped LiCoO2 and Li2TiO3-coated LiCoO2, the cycle performance,
the rate capability and the polarization of Al-doped and Li2TiO3-coated LiCoO2 shows a larger improvement, which can be attributed to the synergic effects of Al-doping and Li2TiO3-coating. Firstly, Al doping expands the interlayer spacing
which decreases the Li-ion diffusion barrier and enhances the coefficient of Li-ion diffusion. This benefits to the rate capability. Secondly, Al doping enhances the layered structure stability due to the larger Al–O bonding energy (ΔH
(Al–O) = 512 kJmol−1) than that of Co–O (ΔH
(Co–O) = 368 kJmol−1). Thirdly, the coating layer of Li2TiO3 mitigates the surface side reactions and further enhances the cycling
performance. Moreover, the coating layer of Li2TiO3 as a Li+-conductor is also favorable to the Li+ diffusion and the rate capability. This synergic strategy can also be extended to the modification of other cathode materials.
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Document Type: Research Article
Center of Materials Science and Optoelectronics Engineering, College of Materials Science and Opto-Electronic Technology, University of Chinese Academy of Sciences, Beijing 100049, P. R. China
Publication date: April 1, 2020
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