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Wu K.,Bayingolin Vocational and Technical College | Yang J.,Bayingolin Vocational and Technical College
Materials Research Bulletin | Year: 2013

The carbon coated Li3V2(PO4) 3/reduced graphene oxide (LVP@C/rGO) composite is successfully synthesized by a conventional solid-state reaction, which is easily scaled up. LVP grains coated with a thin layer (∼8 nm) of carbon are adhered to the surface of the rGO layer and/or enwrapped into the rGO sheets, which can facilitate the fast charge transfer within the whole electrode and to the current collector. As a cathode material, the LVP@C/rGO electrode delivers an initial discharge capacity of 177 mAh g-1 at 0.5 C with capacity retention of 96% during the 50th cycle in a wide voltage range of 3.0-4.8 V. A superior rate capability is also achieved, e.g., exhibiting a discharge capacity of 96 mAh g-1 at a high C rate of 10 C. © 2012 Elsevier Ltd. Source


Wu K.,Bayingolin Vocational and Technical College
Ionics | Year: 2012

The Li 3V 2(PO 4) 3/multiwalled carbon nanotubes (LVP/MWCNTs) composite is successfully synthesized by a sol-gel route using oxalic acid as the chelating reagent. Its structure and physicochemical properties are investigated using X-ray diffraction, field-emission scanning electron microscopy, and electrochemical methods. LVP particles are well mixed with MWCNTs, and most of them are around 100 nm. The galvanostatic charge-discharge tests show that LVP/MWCNTs electrode owns an initial discharge capacity of 126 mAh g -1 at 0. 5 C with capacity retention of 94% during the 100th cycle in the voltage range of 3. 0-4. 3 V. A superior rate capability is also achieved, e. g., exhibiting discharge capacities of 75 and 58 mAh g -1 at high C rates of 10 and 15 C, respectively. © 2011 Springer-Verlag. Source


Zhu J.,Bayingolin Vocational and Technical College | Yang R.,Bayingolin Vocational and Technical College | Wu K.,Bayingolin Vocational and Technical College
Ionics | Year: 2013

The Li3V2(PO4)3/reduced graphene oxide (LVP/rGO) composite is successfully synthesized by a conventional solid-state reaction with a high yield of 10 g, which is suitable for large-scale production. Its structure and physicochemical properties are investigated using X-ray diffraction, Raman spectra, field-emission scanning electron microscopy, transmission electron microscopy, and electrochemical methods. The rGO content is as low as ~3 wt%, and LVP particles are strongly adhered to the surface of the rGO layer and/or enwrapped into the rGO sheets, which can facilitate the fast charge transfer within the whole electrode and to the current collector. The galvanostatic charge-discharge tests show that the LVP/rGO electrode delivers an initial discharge capacity of 177 mAh g-1 at 0. 5 C with capacity retention of 88 % during the 50th cycle in a wide voltage range of 3. 0-4. 8 V. A superior rate capability is also achieved, e. g., exhibiting discharge capacities of 137 and 117 mAh g-1 during the 50th cycle at high C rates of 2 and 5 C, respectively. © 2012 Springer-Verlag. Source

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