Journal
JOURNAL OF MATERIALS CHEMISTRY A
Volume 2, Issue 23, Pages 8696-8704Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c4ta00898g
Keywords
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Funding
- U.S. Department of Energy, Office of Basic Energy Sciences, and Division of Materials Sciences and Engineering [DE-SC0005397]
- National Science Foundation [0618242]
- Division Of Chemistry
- Direct For Mathematical & Physical Scien [0618242] Funding Source: National Science Foundation
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The electrochemical performance of lithium-rich layered oxide cathode materials coated with reduced graphene oxide (rGO)/AlPO4 hybrid coatings has been investigated. The amount of graphene was varied from 0.5 to 4.0 wt%, while AlPO4 was maintained at 2.0 wt%. The structure and morphology of the samples have been investigated using X-ray diffraction, transmission electron microscopy, scanning electron microscopy, and X-ray photoelectron spectroscopy. Compared to the pristine cathode, the rGO/AlPO4-coated cathodes exhibit higher discharge capacity with lower irreversible capacity loss, better cyclability, and higher rate capability. Specifically, the rGO (0.5 wt%)/AlPO4 (2.0 wt%)- and rGO (1.0 wt%)/AlPO4 (2.0 wt%)-coated samples exhibit high discharge capacities of 235 mA h g(-1) and 240 mA h g(-1), respectively, at C/10 rate with capacity retentions of 94% and 95%, respectively, at 100 cycles. Moreover, the rGO/AlPO4-coated cathodes show better cyclability than the pristine cathode at an elevated temperature (55 degrees C). The superior electrochemical performances of the rGO/AlPO4-coated electrodes could be attributed to the decrease in the Li content in the solid-electrolyte interphase (SEI) layer and facilitation of faster charge transfer as suggested by XPS and electrochemical impedance spectroscopy (EIS).
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