Synthesis of V2O5/C core/shell arrays on graphene foam for electrochemical energy storage

Journal Article · Thu Mar 15 04:00:00 EDT 2018 · Materials Research Bulletin

DOI:https://doi.org/10.1016/J.MATERRESBULL.2017.11.054· OSTI ID:22805481

Pan, G. X.; Zhang, Y. J. ^[1]

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1. Department of Materials Chemistry, Huzhou University, Huzhou, 313000 (China)

Highlights: • Construct graphene foam supported V{sub 2}O{sub 5}/C c arrays. • Graphene foam + {sub 2}O{sub 5}/C arrays show large capacity and good cycles. • C layer is favorable for fast ion/electron transfer. - Abstract: V{sub 2}O{sub 5}-based materials are regarded as promising cathode materials for lithium-ion batteries (LIBs) because of their larger theoretical capacities than commercial cathode materials. Herein we develop a united solvothermal-chemical vapor deposition method for construction of bind-free V{sub 2}O{sub 5}/C core/shell arrays on the graphene foams positive electrodes of LIBs. Active V{sub 2}O{sub 5} nanoflakes with thicknesses of 10–15 nm are wrapped by ultrathin carbon layer of 2–4 nm forming core/shell arrays on the GF skeleton. The unique core/shell architecture can provide short ion/electron diffusion paths and substantial protection shell for the active materials, thus leading to accelerated electrochemical kinetics and enhanced cycling stability. A noticeable initial capacity of 290 mAh g{sup −1} at 1C in the voltage range of 2.0–4.0 V and 217 mAh g{sup −1} at 6C after 1000 cycles could be obtained for the GF + V{sub 2}O{sub 5}/C electrode, much better than its GF + V{sub 2}O{sub 5} counterpart.

• OSTI ID: 22805481
• Journal Information: Materials Research Bulletin, Journal Name: Materials Research Bulletin Vol. 99; ISSN MRBUAC; ISSN 0025-5408
• Country of Publication: United States
• Language: English

Related Subjects

25 ENERGY STORAGE
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
CATHODES
CHEMICAL VAPOR DEPOSITION
ELECTRIC POTENTIAL
ELECTROCHEMISTRY
ELECTRON TRANSFER
ENERGY STORAGE
FOAMS
GRAPHENE
LITHIUM ION BATTERIES
REACTION KINETICS
SYNTHESIS
THIN FILMS
VANADIUM OXIDES