Silicon nanoparticles grown on a reduced graphene oxide surface as high-performance anode materials for lithium-ion batteries
- Authors
- Kannan, Aravindaraj G.; Kim, Sang Hyung; Yang, Hwi Soo; Kim, Dong-Won
- Issue Date
- 2016
- Publisher
- ROYAL SOC CHEMISTRY
- Citation
- RSC ADVANCES, v.6, no.30, pp.25159 - 25166
- Indexed
- SCIE
SCOPUS
- Journal Title
- RSC ADVANCES
- Volume
- 6
- Number
- 30
- Start Page
- 25159
- End Page
- 25166
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/155503
- DOI
- 10.1039/c5ra27877e
- ISSN
- 2046-2069
- Abstract
- The growth of silicon nanoparticles on a graphene surface without forming the unwanted silicon carbide (SiC) phase has been challenging. Herein, the critical issues surrounding silicon anode materials for lithium-ion batteries, such as electrode pulverization, unstable solid electrolyte interphase and low electrical conductivity, have been addressed by growing silicon nanoparticles smaller than 10 nm, covalently bonded to a reduced graphene oxide (rGO) surface. The successful growth of SiC-free silicon nanoparticles covalently attached to the rGO surface was confirmed by using various spectroscopic and microscopic analyses. The rGO-Si delivered an initial discharge capacity of 1338.1 mA h g(-1) with capacity retention of 87.1% after the 100th cycle at a current rate of 2100 mA g(-1), and exhibited good rate capability. Such enhanced electrochemical performance is attributed to the synergistic effects of combining ultra-small silicon nanoparticles and rGO nanosheets. Here, rGO provides a continuous electron conducting network, whereas, ultra-small silicon particles reduce ionic diffusion path length and accommodate higher stress during volume expansion upon lithiation.
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