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Issue 19, 2017
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Dichlorosilane-derived nano-silicon inside hollow carbon spheres as a high-performance anode for Li-ion batteries

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Abstract

A novel and cost-effective synthesis of silicon nanocrystallites (<10 nm) sealed in hollow carbon spheres (nc-Si@HCS) is developed as a promising anode material for high-performance Li-ion batteries (LIBs). The preparation method involves dichlorosilane (H2SiCl2) as widely available feedstock, to form a hydrogen-rich polysiloxane as a precursor for the production of large quantities of silicon nanoparticles. The final electrode material is composed of agglomerated 5 nm sized silicon nanoparticles encapsulated within hollow micro-sized carbon structures. A high specific capacity of 1570 mA h gelectrode−1 at 0.25 A g−1 with a capacity retention of 65% after 250 deep discharge cycles and a reversible high areal capacity of up to 4 mA h cm−2 at a total mass loading of 3.2 mg cm−2 impressively demonstrate the excellent features of this novel anode material. We performed a detailed structural as well as electrochemical characterization in different electrolytes. Post mortem investigations help to understand the degradation mechanism in our material. The study herein heralds a new approach to structurally design advanced negative electrode materials with the potential to increase the specific energy of LIBs and to boost future electro-mobility technology.

Graphical abstract: Dichlorosilane-derived nano-silicon inside hollow carbon spheres as a high-performance anode for Li-ion batteries

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Publication details

The article was received on 06 Jan 2017, accepted on 27 Mar 2017 and first published on 29 Mar 2017


Article type: Paper
DOI: 10.1039/C7TA00188F
Citation: J. Mater. Chem. A, 2017,5, 9262-9271
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    Dichlorosilane-derived nano-silicon inside hollow carbon spheres as a high-performance anode for Li-ion batteries

    T. Jaumann, M. Gerwig, J. Balach, S. Oswald, E. Brendler, R. Hauser, B. Kieback, J. Eckert, L. Giebeler and E. Kroke, J. Mater. Chem. A, 2017, 5, 9262
    DOI: 10.1039/C7TA00188F

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