Uniform decoration of vanadium oxide nanocrystals on reduced graphene-oxide balls by an aerosol process for lithium-ion battery cathode material

Seung Ho Choi, Yun Chan Kang

Research output: Contribution to journalArticle

35 Citations (Scopus)

Abstract

VO2-decorated reduced graphene balls were prepared by a one-pot spray-pyrolysis process from a colloidal spray solution of well-dispersed graphene oxide and ammonium vanadate. The graphene-VO2 composite powders prepared directly by spray pyrolysis had poor electrochemical properties. Therefore, the graphene-VO2 composite powders were transformed into a reduced graphene ball (RGB)-V2O5 (RGB) composite by post-treatment at 300 C in an air atmosphere. The TEM and dot-mapping images showed a uniform distribution of V and C components, originating from V2O5 and graphene, consisting the composite. The graphene content of the RGB-V2O5 composite, measured by thermogravimetric analysis, was approximately 5wt %. The initial discharge and charge capacities of RGB-V2O5 composite were 282 and 280mA h g-1, respectively, and the corresponding Coulombic efficiency was approximately 100 %. On the other hand, the initial discharge and charge capacities of macroporous V2O5 powders were 205 and 221mA h g-1, respectively, and the corresponding Coulombic efficiency was approximately 93 %. The RGB-V2O5 composite showed a better rate performance than the macroporous V2O5 powders. Graphene-based ball: V2O5-decorated reduced-graphene balls and macroporous V2O5 powders were prepared by a spray-pyrolysis process. The V2O5-decorated reduced-graphene balls had higher initial charge and discharge capacities and better cycling and rate performances than the macroporous V2O 5 powders (see figure).

Original languageEnglish
Pages (from-to)6294-6299
Number of pages6
JournalChemistry - A European Journal
Volume20
Issue number21
DOIs
Publication statusPublished - 2014 May 19
Externally publishedYes

Fingerprint

Vanadium
Graphite
Aerosols
Lithium
Nanoparticles
Nanocrystals
Oxides
Electrodes
Cathodes
Ions
Powders
Composite materials
Spray pyrolysis
Lithium-ion batteries
vanadium pentoxide
Vanadates
Atmosphere
Electrochemical properties
Ammonium Compounds
Thermogravimetric analysis

Keywords

  • electrochemistry
  • graphene
  • lithium-ion batteries
  • spray pyrolysis
  • vanadium

ASJC Scopus subject areas

  • Chemistry(all)

Cite this

@article{bb004590779644e0a14f8bae3804c0fa,
title = "Uniform decoration of vanadium oxide nanocrystals on reduced graphene-oxide balls by an aerosol process for lithium-ion battery cathode material",
abstract = "VO2-decorated reduced graphene balls were prepared by a one-pot spray-pyrolysis process from a colloidal spray solution of well-dispersed graphene oxide and ammonium vanadate. The graphene-VO2 composite powders prepared directly by spray pyrolysis had poor electrochemical properties. Therefore, the graphene-VO2 composite powders were transformed into a reduced graphene ball (RGB)-V2O5 (RGB) composite by post-treatment at 300 C in an air atmosphere. The TEM and dot-mapping images showed a uniform distribution of V and C components, originating from V2O5 and graphene, consisting the composite. The graphene content of the RGB-V2O5 composite, measured by thermogravimetric analysis, was approximately 5wt {\%}. The initial discharge and charge capacities of RGB-V2O5 composite were 282 and 280mA h g-1, respectively, and the corresponding Coulombic efficiency was approximately 100 {\%}. On the other hand, the initial discharge and charge capacities of macroporous V2O5 powders were 205 and 221mA h g-1, respectively, and the corresponding Coulombic efficiency was approximately 93 {\%}. The RGB-V2O5 composite showed a better rate performance than the macroporous V2O5 powders. Graphene-based ball: V2O5-decorated reduced-graphene balls and macroporous V2O5 powders were prepared by a spray-pyrolysis process. The V2O5-decorated reduced-graphene balls had higher initial charge and discharge capacities and better cycling and rate performances than the macroporous V2O 5 powders (see figure).",
keywords = "electrochemistry, graphene, lithium-ion batteries, spray pyrolysis, vanadium",
author = "Choi, {Seung Ho} and Kang, {Yun Chan}",
year = "2014",
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doi = "10.1002/chem.201400134",
language = "English",
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AU - Choi, Seung Ho

AU - Kang, Yun Chan

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N2 - VO2-decorated reduced graphene balls were prepared by a one-pot spray-pyrolysis process from a colloidal spray solution of well-dispersed graphene oxide and ammonium vanadate. The graphene-VO2 composite powders prepared directly by spray pyrolysis had poor electrochemical properties. Therefore, the graphene-VO2 composite powders were transformed into a reduced graphene ball (RGB)-V2O5 (RGB) composite by post-treatment at 300 C in an air atmosphere. The TEM and dot-mapping images showed a uniform distribution of V and C components, originating from V2O5 and graphene, consisting the composite. The graphene content of the RGB-V2O5 composite, measured by thermogravimetric analysis, was approximately 5wt %. The initial discharge and charge capacities of RGB-V2O5 composite were 282 and 280mA h g-1, respectively, and the corresponding Coulombic efficiency was approximately 100 %. On the other hand, the initial discharge and charge capacities of macroporous V2O5 powders were 205 and 221mA h g-1, respectively, and the corresponding Coulombic efficiency was approximately 93 %. The RGB-V2O5 composite showed a better rate performance than the macroporous V2O5 powders. Graphene-based ball: V2O5-decorated reduced-graphene balls and macroporous V2O5 powders were prepared by a spray-pyrolysis process. The V2O5-decorated reduced-graphene balls had higher initial charge and discharge capacities and better cycling and rate performances than the macroporous V2O 5 powders (see figure).

AB - VO2-decorated reduced graphene balls were prepared by a one-pot spray-pyrolysis process from a colloidal spray solution of well-dispersed graphene oxide and ammonium vanadate. The graphene-VO2 composite powders prepared directly by spray pyrolysis had poor electrochemical properties. Therefore, the graphene-VO2 composite powders were transformed into a reduced graphene ball (RGB)-V2O5 (RGB) composite by post-treatment at 300 C in an air atmosphere. The TEM and dot-mapping images showed a uniform distribution of V and C components, originating from V2O5 and graphene, consisting the composite. The graphene content of the RGB-V2O5 composite, measured by thermogravimetric analysis, was approximately 5wt %. The initial discharge and charge capacities of RGB-V2O5 composite were 282 and 280mA h g-1, respectively, and the corresponding Coulombic efficiency was approximately 100 %. On the other hand, the initial discharge and charge capacities of macroporous V2O5 powders were 205 and 221mA h g-1, respectively, and the corresponding Coulombic efficiency was approximately 93 %. The RGB-V2O5 composite showed a better rate performance than the macroporous V2O5 powders. Graphene-based ball: V2O5-decorated reduced-graphene balls and macroporous V2O5 powders were prepared by a spray-pyrolysis process. The V2O5-decorated reduced-graphene balls had higher initial charge and discharge capacities and better cycling and rate performances than the macroporous V2O 5 powders (see figure).

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