CUED Publications database

Evolution of Reduced Graphene Oxide-SnS<inf>2</inf> Hybrid Nanoparticle Electrodes in Li-Ion Batteries

Modarres, MH and Lim, JHW and George, C and De Volder, M (2017) Evolution of Reduced Graphene Oxide-SnS<inf>2</inf> Hybrid Nanoparticle Electrodes in Li-Ion Batteries. Journal of Physical Chemistry C, 121. pp. 13018-13024. ISSN 1932-7447

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Abstract

© 2017 American Chemical Society. Hybrid nanomaterials where active battery nanoparticles are synthesized directly onto conductive additives such as graphene hold the promise of improving the cyclability and energy density of conversion and alloying type Li-ion battery electrodes. Here we investigate the evolution of hybrid reduced graphene oxide-tin sulfide (rGO-SnS 2 ) electrodes during battery cycling. These hybrid nanoparticles are synthesized by a one-step solvothermal microwave reaction which allows for simultaneous synthesis of the SnS 2 nanocrystals and reduction of GO. Despite the hybrid architecture of these electrodes, electrochemical impedance spectroscopy shows that the impedance doubles in about 25 cycles and subsequently gradually increases, which may be caused by an irreversible surface passivation of rGO by sulfur enriched conversion products. This surface passivation is further confirmed by post-mortem Raman spectroscopy of the electrodes, which no longer detects rGO peaks after 100 cycles. Moreover, galvanostatic intermittent titration analysis during the 1st and 100th cycles shows a drop in Li-ion diffusion coefficient of over an order of magnitude. Despite reports of excellent cycling performance of hybrid nanomaterials, our work indicates that in certain electrode systems, it is still critical to further address passivation and charge transport issues between the active phase and the conductive additive in order to retain high energy density and cycling performance. (Graph Presented).

Item Type: Article
Subjects: UNSPECIFIED
Divisions: Div E > Production Processes
Depositing User: Cron Job
Date Deposited: 24 Jul 2017 20:10
Last Modified: 21 Sep 2017 01:41
DOI: