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Issue 7, 2016
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Phenyl-rich silicone oil as a precursor for SiOC anode materials for long-cycle and high-rate lithium ion batteries

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Abstract

Silicon oxycarbide (SiOC) is gaining increasing attention as a promising anode material for lithium ion batteries due to its higher reversible capacity compared to incumbent graphite. The kinetic processes at a SiOC anode result in rapid capacity fading even at a relatively low current density, thereby hindering its commercialization. Herein, a distinctive, phenyl-rich silicone oil is used as a precursor for producing SiOC anode materials via simple pyrolysis. We find that only silicone oil with phenyl-rich rings can be converted into SiOC materials. The phenyl group was crucial for carbon incorporation to allow Si–O–C bonding and the formation of a free-carbon phase. The resulting SiOC anode exhibited stable cyclability up to 250 cycles, with a discharge capacity of 800 mA h g−1 at a current density of 200 mA g−1. The remarkable cycle performance of SiOC was correlated with its low dimensional expansion (7%) during lithiation, which maintains its structure over cycling. Rate capability tests showed a highly stable performance with a maximum discharge capacity of 852 mA h g−1 at a current density of 100 mA g−1. When the discharge current density was increased 64-fold, the reversible capacity of the SiOC anode was 90% of its maximum capacity, 772 mA h g−1. The excellent electrochemical performance of SiOC could be attributed to the rapid mobility of Li+ within the SiOC matrix, as indicated by a Li+ diffusion coefficient of 5.1 × 10−6 cm2 s−1.

Graphical abstract: Phenyl-rich silicone oil as a precursor for SiOC anode materials for long-cycle and high-rate lithium ion batteries

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Publication details

The article was received on 07 Dec 2015, accepted on 21 Jan 2016 and first published on 22 Jan 2016


Article type: Paper
DOI: 10.1039/C5TA09973K
Citation: J. Mater. Chem. A, 2016,4, 2651-2656
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    Phenyl-rich silicone oil as a precursor for SiOC anode materials for long-cycle and high-rate lithium ion batteries

    M. Halim, C. Hudaya, A. Kim and J. K. Lee, J. Mater. Chem. A, 2016, 4, 2651
    DOI: 10.1039/C5TA09973K

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