Adorned Li-rich Li1.2Ni0.13Co0.13Mn0.54O2 with LiAlO2 for improved electrochemical properties in lithium-ion batteries
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In this paper, core-shell like LiAlO2-coated Li1.2Ni0.13Co0.13Mn0.54O2 composite was synthesized by an improved solvothermal method. The surface of the material becomes rough after LiAlO2 coating with a thickness of 5–10 nm. Meanwhile, the surface-coating component with the layer structure α-LiAlO2 can change the dispersion of transition metal elements. When tested in 2.0–4.8 V at 0.05 °C, the initial discharge capacity of the LiAlO2-coated sample is 206.4 mAh g−1 with the columbic efficiency of 78.0%, which is higher than that of the pristine Li-rich Li1.2Ni0.13Co0.13Mn0.54O2 sample. Further tested under 1 C rate, the coated sample possesses 151.4 mAh g−1 of specific capacity and maintains 149.0 mAh g−1 after 50 cycles with the capacity retention of 98.4%. The improved reversible capacity, rate capability, and cycling durability of the Li1.2Ni0.13Co0.13Mn0.54O2 material are attributed to the synergistic effect of surface coating of highly Li-conductive LiAlO2 and the fuzzy interface between LiAlO2 and Li1.2Ni0.13Co0.13Mn0.54O2.
KeywordsLithium-ion battery LiAlO2 coating Li-rich cathode material Solvothermal reaction
This study was financially supported by the National Natural Science Foundation of China (NSFC No. 21471135), the Key R&D and Promotion Projects in Henan Province (No. 2019410104000024), and the Doctoral Research Foundation of Zhengzhou University of Light Industry (No. 2017BSJJ043).
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