期刊
JOURNAL OF POWER SOURCES
卷 486, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.jpowsour.2020.229350
关键词
Reduced graphene oxide; Graphene aerogel; Silicon; Binder-free anode; Lithium-ion battery
资金
- Korea Institute of Science and Technology (KIST) Institutional Program
- Nano.Material Technology Development Program through the National Research Foundation of Korea (NRF) - Ministry of Science and ICT [2016M3A7B4027695]
- National Research Foundation of Korea [2016M3A7B4027695] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
Si-based composites wrapped in multiple graphene shells were successfully fabricated as binder-free anodes for Li-ion batteries, exhibiting high initial discharge capacity, excellent cyclic stability, and superior rate capability. The multilayered structure contributed to the enhanced performance of the LIBs and could potentially advance the development of high-performance LIBs for electric vehicles.
Si-based composites wrapped in multiple graphene shells were successfully fabricated as binder-free anodes for Li-ion batteries (LIBs). Reduced graphene oxide (rGO) and Si nanoparticles were prepared as spherical composite structures using a facile spray-drying process. The microspheres were homogeneously incorporated into a 3D porous graphene aerogel (GA) structure using an aerogel synthesis process. The inner rGO shell surrounding the Si nanoparticles promoted an effective electron transfer from the surface of the Si nanoparticles to electrolytes and suppressed the continuous formation of an unstable solid-electrolyte interface layer. Moreover, the 3D, porous GA framework, which demonstrated high electrical conductivity and mechanical stability, promoted the homogeneous dispersion of the Si nanoparticles, an effective and fast Li+ ion diffusion, and the suppression of volume expansion during lithiation. The rGO/Si/GA composite anode constructed by multiple graphene shells had an extremely high initial discharge capacity (1217 mAh g(-1)), excellent cyclic stability (462 mAh g(-1) at 1.0 C after 200 cycles), and superior rate capability (819 mAh g(-1) at 10 C) owing to its multilayered structure. We expect that our simple and scalable approach for fabricating Si-based anodes wrapped in multiple graphene shells can contribute to the development of high-performance LIBs for use in electric vehicles.
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