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Improving Cycling Stability and Rate Capability of High-Voltage LiCoO2 Through an Integration of Lattice Doping and Nanoscale Coating

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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 298 K t (Al–O) = 512 kJmol−1) than that of Co–O (ΔH 298 K t (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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Keywords: Al Doping; High-Voltage LiCoO2; Li2TiO3 Coating; Synergic Strategy

Document Type: Research Article

Affiliations: 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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  • Journal for Nanoscience and Nanotechnology (JNN) is an international and multidisciplinary peer-reviewed journal with a wide-ranging coverage, consolidating research activities in all areas of nanoscience and nanotechnology into a single and unique reference source. JNN is the first cross-disciplinary journal to publish original full research articles, rapid communications of important new scientific and technological findings, timely state-of-the-art reviews with author's photo and short biography, and current research news encompassing the fundamental and applied research in all disciplines of science, engineering and medicine.
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