Dichlorosilane-derived nano-silicon inside hollow carbon spheres as a high-performance anode for Li-ion batteries
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Authors
Organisational units
External Organisational units
- Leibniz Institute for Solid State and Materials Research, Dresden
- Institute of Mechanics and Fluid Dynamics, TU Bergakademie Freiberg
- Universidad Nacional de Río Cuarto-CONICET
- Fraunhofer Institute for Manufacturing Technology and Advanced Materials IFAM
- Erich Schmid Institute of Materials Science
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.
Details
Original language | English |
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Pages (from-to) | 9262-9271 |
Number of pages | 10 |
Journal | Journal of Materials Chemistry A |
Volume | 5.2017 |
Issue number | 19 |
Early online date | 29 Mar 2017 |
DOIs | |
Publication status | Published - May 2017 |