Journal
JOURNAL OF POWER SOURCES
Volume 298, Issue -, Pages 114-122Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jpowsour.2015.08.031
Keywords
Lithium-ion batteries; Lithium cobalt oxide; Magnetron sputtering; Electrode coating; Alumina-doped zinc oxide; Solid electrolyte interface
Funding
- National Natural Science Foundation of China [21073029, 11234013, 21473022]
- Science and Technology Bureau of Sichuan Province of China [2015HH0033]
- Fundamental Research Funds for the Central Universities [ZYGX2012Z003]
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A conductive Al2O3-doped ZnO (AZO) layer is coated directly on the LiCoO2 (LCO) porous composite electrode by magnetron sputtering of an AZO target, offering more efficient electron transfer and a stabilized interface layer. Up to 90% of the initial capacity of the AZO-coated electrode can be retained (173 mAh g(-1)) after 150 cycles between 3.0 and 4.5 V vs. Li/Li+. Meanwhile, the rate performance is remarkably improved showing a reversible capacity of 112 mAh g(-1) at 12 C. The formation of amorphous solid electrolyte interface (SEI) observed on the uncoated LCO electrode is effectively impeded on the AZO-coated one. Acting as an intermediate barrier, the AZO layer can prevent chemical dissolution of the active materials by forming a thin passivation layer on the electrode surface containing some metal fluorides which are chemically inactive and ionically conductive. The positive role of the AZO coating is still effective under a more severe condition tested with an upper cut-off potential of 4.7 V. (C) 2015 Elsevier B.V. All rights reserved.
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