Abstract
The use of Li-excess approach can achieve efficient lithium ion storage of cation-disordered rock-salt cathode materials. However, their application is limited by poor intrinsic electronic conductivity and insufficient Li-ion diffusion. Herein, a carbon nanotube is incorporated in the Li-excess Li1.24Fe0.38Ti0.38O2 cathode material, resulting in the formation of refined Li1.24Fe0.38Ti0.38O2 nanoparticles that are well loaded in a continuous conductive network. This facilitates the charge transfer and ion diffusion in the cathode. The as-prepared Li1.24Fe0.38Ti0.38O2/carbon nanotube (LFT/CNT) cathode, therefore, delivers significantly enhanced rate capability with a reversible capacity of 108 mAh g−1 after 200 cycles at 1 C compared to 36 mAh g−1 of the as-prepared LFT cathode. The result of ex situ x-ray diffraction demonstrates the reversible and small lattice volume change of the LFT/CNT cathode during cycling.
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Acknowledgments
This work is supported by the National Natural Science Foundation of China (Grant No. 51674147), the Natural Science Foundation of the Higher Education Institutions of Jiangsu Province (Grant No. 19KJB480013), the Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD), and Postgraduate Research and Practice Innovation Program of Jiangsu Province.
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Shen, Y., Yang, Y., Li, J. et al. Carbon Nanotube Supported Li-Excess Cation-Disordered Li1.24Fe0.38Ti0.38O2 Cathode with Enhanced Lithium-Ion Storage Performance. J. Electron. Mater. 50, 5029–5036 (2021). https://doi.org/10.1007/s11664-021-08975-9
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DOI: https://doi.org/10.1007/s11664-021-08975-9