A silicon nanoparticle/reduced graphene oxide composite anode with excellent nanoparticle dispersion to improve lithium ion battery performance
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Composite anodes of Si nanoparticles (SiNPs) and reduced graphene oxide (RGO) sheets with highly dispersed SiNPs were synthesized to investigate the performance-related improvements that particle dispersion can impart. Three composites with varying degrees of particle dispersions were prepared using different ultrasonication, and a combination of ultrasonication and surfactant. With more dispersed SiNPs, the capacity retention and rate performance as evaluated by galvanostatic cycling using increasing current density rates (500–2500 mA/g) also improved compared with anodes that have poor particle dispersion. These results demonstrate that better nanoparticle dispersion (small clusters to mono-dispersed particles) between the stable and the highly conducting RGO layers, allows the carbonaceous matrix material to complement the SiNP-Li+ electrochemistry by becoming highly involved in the charge–discharge reaction mechanisms as indicated by chronopotentiometry and cyclic voltammetry (CV). Particle dispersion improvement was confirmed to be a key component in a composite anode design to maximize Si for high-performance lithium ion battery (LIB) application.
KeywordsGraphene Oxide Discharge Capacity Reduce Graphene Oxide Graphite Oxide Coulombic Efficiency
Financial support from the Department of Energy (Grant DE-EE0002106) for this research is gratefully acknowledged.
- 9.Peng K, Jie J, Zhang W, Lee ST (2008) Appl Phys Lett 93:0331051Google Scholar
- 28.Aifantis KE, Haycock M, Sanders P, Hackney SA (2012) Mater Sci Eng, A 529:55Google Scholar
- 34.Rao CV, Reddy ALM, Ishikawa Y, Ajayan PM (2011) Carbon 49(931–936):936Google Scholar