期刊
ACS APPLIED MATERIALS & INTERFACES
卷 6, 期 12, 页码 9185-9193出版社
AMER CHEMICAL SOC
DOI: 10.1021/am501293y
关键词
lithium-ion batteries; lithium-rich layered oxide cathode; zinc oxide coating; reactive magnetron sputtering; initial coulombic efficiency
资金
- Key Research Program of Chinese Academy of Sciences [KGZD-EW-202-4]
- Ningbo Science and Technology Innovation Team [2012B82001]
- 973 program [2011CB935900]
Electrode films fabricated with lithium-rich layered 0.3Li(2)MnO(3)-0.7LiNi(5/21)Co(5/21)Mn(11/21)O(2) cathode materials have been successfully modified with ZnO coatings via a reactive magnetron sputtering (RMS) process for the first time. The morphology and chemical composition of coating films on the electrodes have been in deep investigated by transmission electron microscopy (TEM), energy dispersive spectrometry (EDS), and Xray photoelectron spectroscopy (XPS) characterizations. The results clearly demonstrate that ZnO film coatings are ultrathin, dense, uniform, and fully covered on the electrodes. The RMS-2 min (deposition time) coated electrode exhibits much higher initial discharge capacity and coulombic efficiency with 316.0 mAh g(-1) and 89.1% than that of the pristine electrode with 283.4 mAh g(-1) and 81.7%. In addition, the discharge capacity also reaches 256.7 and 187.5 mAh g(-1) at 0.1 and 1.0 C-rate, as compared to that of 238.4 and 157.8 mAh g(-1) after 50 cycles. The improved electrochemical performances of RMS-coated electrodes are ascribed to the high-quality ZnO film coatings that reduce charge transfer resistance and effectively protect active material from electrolyte oxidation.
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