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Issue 35, 2014
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High capacity silicon nitride-based composite anodes for lithium ion batteries

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Abstract

A new composite material comprised of Si nitride (SiNx) derived from Si nanoparticles (SiNPs) via a vacuum CVD approach within a graphene matrix was synthesized as a potential Li ion battery (LIB) anode material. The deposition technique generated an external composition of Si3N4 and SiN0.73 on the SiNP, with the overall N-levels increasing with deposition time. The SiNx electrochemical reaction can be attributed to a two-stage reversible mechanism: first the SiNx phase was converted to a matrix of Li3N with embedded nano Si, and then the Si content participates in the high capacity alloying/dealloying reactions. Galvanostatic cycling of the composite (50% Si w/w) using 500 mA g−1 displayed exceptionally stable capacity around 1400 mA h g−1 attributed to the improved stress management and conductivity of the Li3N matrix. SiNx is demonstrated to be a compelling anode for LIBs, and with further development and optimization this might become the leading contender for the high capacity anode to possibly succeed current graphitic electrodes.

Graphical abstract: High capacity silicon nitride-based composite anodes for lithium ion batteries

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Publication details

The article was received on 24 May 2014, accepted on 23 Jun 2014 and first published on 24 Jun 2014


Article type: Paper
DOI: 10.1039/C4TA02596B
Author version available: Download Author version (PDF)
Citation: J. Mater. Chem. A, 2014,2, 14577-14584
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    High capacity silicon nitride-based composite anodes for lithium ion batteries

    R. C. de Guzman, J. Yang, M. Ming-Cheng Cheng, S. O. Salley and K. Y. S. Ng, J. Mater. Chem. A, 2014, 2, 14577
    DOI: 10.1039/C4TA02596B

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