Abstract
Li[Ni0.80Co0.15Al0.05]O2 is considered as a promising cathode material due to its high specific capacity. Nevertheless, the irreversible formation of electrochemically inactive NiO phase on the surface of the particles would significantly deduce impedance rise and power decrease during cycling. Herein, a thin-layer AlF3-coated Li[Ni0.80Co0.15Al0.05]O2 has been synthesized via a facile solution method, and the optimized coating content has been confirmed. Compared with the pristine sample, the 0.5% AlF3−coated Li[Ni0.80Co0.15Al0.05]O2 composite exhibits significantly improved cycling stability and high-temperature performance. The improved electrochemical properties can be attributed to that the thin AlF3 layer can stabilize the surface structure of active material and a LiAlO2 phase with high ionic conductivity is formed on the surface of the particles during cycling.
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This work was supported by the Natural Science Foundation of China (21805182), Shanghai Sailing Program (17YF1406500).
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Li, W., Zhuang, H., Guo, L. et al. Improvement of cycling stability and high-temperature performance of Li[Ni0.80Co0.15Al0.05]O2 cathode by thin-layer AlF3 coating. J Mater Sci: Mater Electron 31, 11141–11149 (2020). https://doi.org/10.1007/s10854-020-03663-6
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DOI: https://doi.org/10.1007/s10854-020-03663-6