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Title: Graphene-based surface modification on layered Li-rich cathode for high-performance Li-ion batteries
Authors: Song, B.
Lai, M.O. 
Liu, Z.
Liu, H.
Lu, L. 
Issue Date: 14-Sep-2013
Citation: Song, B., Lai, M.O., Liu, Z., Liu, H., Lu, L. (2013-09-14). Graphene-based surface modification on layered Li-rich cathode for high-performance Li-ion batteries. Journal of Materials Chemistry A 1 (34) : 9954-9965. ScholarBank@NUS Repository.
Abstract: A Li-rich cathode material Li(Li0.2Mn0.54Ni 0.13Co0.13)O2 synthesized by a sol-gel method is further modified by wrapping with graphene oxide (GO) using a simple chemical approach and post thermal annealing. X-ray diffraction (XRD), Raman spectroscopy, high resolution transmission electron microscopy (HRTEM) and X-ray photoelectron spectroscopy (XPS) characterizations show that annealing of the GO-wrapped material leads to a transformation from the original layered structure to a spinel phase on the surfaces of the powder particles. The electrochemical performance, and in particular the rate capability, is observed to be significantly enhanced as a result of this unique surface-treated Li-rich cathode/graphene composite structure. The modified sample reveals a very high discharge capacity of 313 mA h g-1 at a current density of 12.5 mA g-1, and 201 mA h g-1 charge capacity at an extremely high current density of 2500 mA g-1. Such improvement is ascribed to the co-existence of reduced GO, the locally transformed spinel-like structure and the recrystallized particles on the surfaces of the primary particles. © 2013 The Royal Society of Chemistry.
Source Title: Journal of Materials Chemistry A
ISSN: 20507488
DOI: 10.1039/c3ta11580a
Appears in Collections:Staff Publications

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