期刊
NANO ENERGY
卷 44, 期 -, 页码 111-120出版社
ELSEVIER
DOI: 10.1016/j.nanoen.2017.11.010
关键词
LiNi0.6Mn0.2Co0.2O2; Al2O3; LiAlO2; Coating; Lithium ion batteries; Cathode materials
类别
资金
- National Natural Science Foundation of China [51572194, 51672189]
- Key Project of the Tianjin Science & Technology Support Program [17YFZCGX00550]
- Academic Innovation Funding of Tianjin Normal University [52XC1404]
LiNi0.6Co0.2Mn0.2O2 (NCM) is a highly potential cathode material for lithium-ion batteries (LIBs). However, its poor rate capability and cycling performance at high cutoff voltages have seriously hindered further commercialization. In this study, we successfully design an ultra-thin lithium aluminum oxide (LiAlO2) coating on NCM for LIBs. Compared to Al2O3, the utilization of lithium-ion conducting LiAlO2 significantly improves the NCM performance at high cutoff voltages of 4.5/4.7 V. The study reveals that the LiAlO2-coated NCM can maintain a reversible capacity of more than 149 mA h g(-1) after 350 cycles with 0.078% decay per cycle. Furthermore, LiAlO2-coated NCM exhibits higher rate capacities [206.8 mA h g(-1) at 0.2 C (50 mA g(-1)) and 142 mA h g(-1) at 3 C] than the Al2O3-coated NCM (196.9 mA h g(-1) at 0.2 C and 131.9 mA h g(-1) at 3 C). Our study demonstrates that the ultra-thin LiAlO2 coating is superior to Al2O3 and significantly improves the capacity retention and rate capability of NCM for LIBs.
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