Journal
IONICS
Volume 26, Issue 5, Pages 2147-2156Publisher
SPRINGER HEIDELBERG
DOI: 10.1007/s11581-019-03416-4
Keywords
Lithium-ion batteries; Cathode materials; Ni-rich materials; Al-doping; Surface modification
Funding
- National Natural Science Foundation of China [51762006, 51964013, 51864007]
- Guangxi Key Research and Development Program of Science and Technology [GUIKE AB17195065, AB17129011]
- Guangxi Technology Base and Talent Subject [GUIKE AD18126001, GUIKE AD17195084]
- Opening Project of Guangxi Key Laboratory of Calcium Carbonate Resources Comprehensive Utilization [HZXYKFKT201807]
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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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