Abstract
Ni-rich oxide materials suffer poor rate capability and rapid capacity fading, which seriously hinder its further commercialization. In this study, an ultrathin Al2O3 coating layer on surface of the LiNi0.6Co0.2Mn0.2O2 (NCM) material was prepared with Al(OC4H9)4 in organic medium; the process followed by heat treatment achieves Al doping. The synergistic effect of surface modification and Al doping significantly enhances the capacity retention and rate performance, while the resistance to moisture is also improved. The coated sample with 2wt% Al2O3 shows superior electrochemical performances with an initial capacity of 175 mAh g−1 at 1 C and a retention of 80% after 500 cycles, which is 10% higher than the uncoated raw materials. In addition, it delivers 152 mAh g−1 at 10 C, suggesting an excellent rate capability. The substitution of Al3+ and the Al2O3 protective layer facilitates ion diffusion dynamic characteristic and improves electrochemical stability.
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Funding
This research was supported by National Natural Science Foundation of China (51762006, 51964013, and 51864007), Guangxi Key Research and Development Program of Science and Technology (GUIKE AB17195065 and AB17129011), Guangxi Technology Base and Talent Subject (GUIKE AD18126001 and GUIKE AD17195084), and Opening Project of Guangxi Key Laboratory of Calcium Carbonate Resources Comprehensive Utilization (HZXYKFKT201807).
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Wang, H., Yang, G., Lai, F. et al. Ultrathin Al2O3 layer modified LiNi0.6Co0.2Mn0.2O2 with Al-doping for high performance lithium ion batteries. Ionics 26, 2147–2156 (2020). https://doi.org/10.1007/s11581-019-03416-4
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DOI: https://doi.org/10.1007/s11581-019-03416-4