Graphene Folding in Si Rich Carbon Nanofibers for Highly Stable, High Capacity Li-Ion Battery Anodes
- 17 February 2016
- journal article
- Published by American Chemical Society (ACS) in ACS Applied Materials & Interfaces
- Vol. 8 (8), 5243-5250
- https://doi.org/10.1021/acsami.5b10548
Abstract
Silicon nanoparticles (Si NPs) wrapped by graphene in carbon nanofibers were obtained via electrospinning and subsequent thermal treatment. In this study, water-soluble poly(vinyl alcohol) (PVA) with low carbon yield is selected to make the process water-based and to achieve a high silicon yield in the composite. It was also found that increasing the amount of graphene helps keep the PVA fiber morphology after carbonization, while forming a graphene network. The fiber SEM and HRTEM images reveal that micrometer graphene is heavily folded into sub-micron scale fibers during electrospinning, while Si NPs are incorporated into the folds with nanospace in between. When applied to lithium-ion battery anodes, the Si/graphene/carbon nanofiber composites show a high reversible capacity of ∼2300 mAh g(-1) at a charging rate of 100 mA/g and a stable capacity of 1191 mAh g(-1) at 1 A/g after more than 200 cycles. The interconnected graphene network not only ensures the excellent conductivity but also serves as a buffering matrix for the mechanic stress caused by volume change; the nanospace between Si NPs and folded graphene provides the space needed for volume expansion.Funding Information
- Axium Nanofibers LLC (71894)
This publication has 36 references indexed in Scilit:
- High‐Performance Hybrid Supercapacitor Enabled by a High‐Rate Si‐based AnodeAdvanced Functional Materials, 2014
- Lithium Ion Battery Peformance of Silicon Nanowires with Carbon SkinACS Nano, 2013
- Silicon‐Rich Carbon Hybrid Nanofibers from Water‐Based Spinning: The Synergy Between Silicon and Carbon for Li‐ion Battery Anode ApplicationChemElectroChem, 2013
- Micro‐sized Si‐C Composite with Interconnected Nanoscale Building Blocks as High‐Performance Anodes for Practical Application in Lithium‐Ion BatteriesAdvanced Energy Materials, 2012
- A Yolk-Shell Design for Stabilized and Scalable Li-Ion Battery Alloy AnodesNano Letters, 2012
- Self‐Assembled Nanocomposite of Silicon Nanoparticles Encapsulated in Graphene through Electrostatic Attraction for Lithium‐Ion BatteriesAdvanced Energy Materials, 2012
- Electrospun Core–Shell Fibers for Robust Silicon Nanoparticle-Based Lithium Ion Battery AnodesNano Letters, 2012
- Core double-shell Si@SiO2@C nanocomposites as anode materials for Li-ion batteriesChemical Communications, 2010
- High-performance lithium battery anodes using silicon nanowiresNature Nanotechnology, 2007
- Review of selected electrode–solution interactions which determine the performance of Li and Li ion batteriesJournal of Power Sources, 2000