Preparation of a reduced graphene oxide wrapped lithium-rich cathode material by self-assembly.

Abstract

A lithium-rich cathode material wrapped in sheets of reduced graphene oxide (RGO) and functionalized with polydiallyldimethylammonium chloride (PDDA) was prepared by self-assembly induced from the electrostatic interaction between PDDA-RGO and the Li-rich cathode material. At current densities of 1000 and 2000 mA g(-1), the PDDA-RGO sheet wrapped samples demonstrated increased discharge capacities, increasing from 125 to 155 mA h g(-1) and from 82 to 124 mA h g(-1), respectively. The decreased resistance implied by this result was confirmed from electrochemical impedance spectroscopy results, wherein the charge-transfer resistance of the pristine sample decreased after wrapping with the PDDA-RGO sheets. The PDDA-RGO sheets served as a protective layer sand as a conductive material, which resulted in an improvement in the retention capacity from 56 to 81% after 90 cycles.

DOI: 10.1002/asia.201402517

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Cite this paper

@article{Lim2014PreparationOA, title={Preparation of a reduced graphene oxide wrapped lithium-rich cathode material by self-assembly.}, author={Sung Nam Lim and Wook Ahn and Sun-Hwa Yeon and Seung Bin Park}, journal={Chemistry, an Asian journal}, year={2014}, volume={9 10}, pages={2946-52} }